taxonID	type	format	identifier	references	title	description	created	creator	contributor	publisher	audience	source	license	rightsHolder	datasetID
038587FE5142FFE26AE5FD90DCBAFB7F.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700774/files/figure.png	https://doi.org/10.5281/zenodo.13700774	FIGURES 2–12. Chaetoceros coarctatus, Chaetoceros dadayi, Chaetoceros danicus. Figs 2–6: LM. Figs 7, 9–12: TEM. Fig. 8: SEM. Figs 2–3: Chaetoceros coarctatus field material. 2) Middle part of a chain, note the narrow apertures and attached ciliate cells. 3) Terminal part of a chain showing the orientation of the setae. Arrows indicate plastids within the setae. Fig. 4: Chaetoceros dadayi field material. Complete chain with the attached tininnid lorica. Note the characteristic orientation of intercalary setae. Figs 5–12: Chaetoceros danicus culture material, strain PMFDA1. 5) Cell in valve view, note the cross orientation of the setae. 6) Chain of two cells in girdle view. 7) Valve view showing the fine structure. 8) Internal view of the valve. 9) Fine structure of the two overlaid valves with the siliceous thickenings on the valve margin (arrow) 10) Detail of a seta. 11) Single side of the seta with arrowhead spines and poroids arranged in a grid pattern. 12) Detail of a girdle band. Scale bars: 3=50 μm; 2, 4, 5=20 μm; 6=10 μm; 7, 9=5 μm; 8=2 μm; 10–12=1 μm.	FIGURES 2–12. Chaetoceros coarctatus, Chaetoceros dadayi, Chaetoceros danicus. Figs 2–6: LM. Figs 7, 9–12: TEM. Fig. 8: SEM. Figs 2–3: Chaetoceros coarctatus field material. 2) Middle part of a chain, note the narrow apertures and attached ciliate cells. 3) Terminal part of a chain showing the orientation of the setae. Arrows indicate plastids within the setae. Fig. 4: Chaetoceros dadayi field material. Complete chain with the attached tininnid lorica. Note the characteristic orientation of intercalary setae. Figs 5–12: Chaetoceros danicus culture material, strain PMFDA1. 5) Cell in valve view, note the cross orientation of the setae. 6) Chain of two cells in girdle view. 7) Valve view showing the fine structure. 8) Internal view of the valve. 9) Fine structure of the two overlaid valves with the siliceous thickenings on the valve margin (arrow) 10) Detail of a seta. 11) Single side of the seta with arrowhead spines and poroids arranged in a grid pattern. 12) Detail of a girdle band. Scale bars: 3=50 μm; 2, 4, 5=20 μm; 6=10 μm; 7, 9=5 μm; 8=2 μm; 10–12=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5142FFE26AE5FB74DC07F943.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700774/files/figure.png	https://doi.org/10.5281/zenodo.13700774	FIGURES 2–12. Chaetoceros coarctatus, Chaetoceros dadayi, Chaetoceros danicus. Figs 2–6: LM. Figs 7, 9–12: TEM. Fig. 8: SEM. Figs 2–3: Chaetoceros coarctatus field material. 2) Middle part of a chain, note the narrow apertures and attached ciliate cells. 3) Terminal part of a chain showing the orientation of the setae. Arrows indicate plastids within the setae. Fig. 4: Chaetoceros dadayi field material. Complete chain with the attached tininnid lorica. Note the characteristic orientation of intercalary setae. Figs 5–12: Chaetoceros danicus culture material, strain PMFDA1. 5) Cell in valve view, note the cross orientation of the setae. 6) Chain of two cells in girdle view. 7) Valve view showing the fine structure. 8) Internal view of the valve. 9) Fine structure of the two overlaid valves with the siliceous thickenings on the valve margin (arrow) 10) Detail of a seta. 11) Single side of the seta with arrowhead spines and poroids arranged in a grid pattern. 12) Detail of a girdle band. Scale bars: 3=50 μm; 2, 4, 5=20 μm; 6=10 μm; 7, 9=5 μm; 8=2 μm; 10–12=1 μm.	FIGURES 2–12. Chaetoceros coarctatus, Chaetoceros dadayi, Chaetoceros danicus. Figs 2–6: LM. Figs 7, 9–12: TEM. Fig. 8: SEM. Figs 2–3: Chaetoceros coarctatus field material. 2) Middle part of a chain, note the narrow apertures and attached ciliate cells. 3) Terminal part of a chain showing the orientation of the setae. Arrows indicate plastids within the setae. Fig. 4: Chaetoceros dadayi field material. Complete chain with the attached tininnid lorica. Note the characteristic orientation of intercalary setae. Figs 5–12: Chaetoceros danicus culture material, strain PMFDA1. 5) Cell in valve view, note the cross orientation of the setae. 6) Chain of two cells in girdle view. 7) Valve view showing the fine structure. 8) Internal view of the valve. 9) Fine structure of the two overlaid valves with the siliceous thickenings on the valve margin (arrow) 10) Detail of a seta. 11) Single side of the seta with arrowhead spines and poroids arranged in a grid pattern. 12) Detail of a girdle band. Scale bars: 3=50 μm; 2, 4, 5=20 μm; 6=10 μm; 7, 9=5 μm; 8=2 μm; 10–12=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5142FFEC6AE5F910D9C6FDD1.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700774/files/figure.png	https://doi.org/10.5281/zenodo.13700774	FIGURES 2–12. Chaetoceros coarctatus, Chaetoceros dadayi, Chaetoceros danicus. Figs 2–6: LM. Figs 7, 9–12: TEM. Fig. 8: SEM. Figs 2–3: Chaetoceros coarctatus field material. 2) Middle part of a chain, note the narrow apertures and attached ciliate cells. 3) Terminal part of a chain showing the orientation of the setae. Arrows indicate plastids within the setae. Fig. 4: Chaetoceros dadayi field material. Complete chain with the attached tininnid lorica. Note the characteristic orientation of intercalary setae. Figs 5–12: Chaetoceros danicus culture material, strain PMFDA1. 5) Cell in valve view, note the cross orientation of the setae. 6) Chain of two cells in girdle view. 7) Valve view showing the fine structure. 8) Internal view of the valve. 9) Fine structure of the two overlaid valves with the siliceous thickenings on the valve margin (arrow) 10) Detail of a seta. 11) Single side of the seta with arrowhead spines and poroids arranged in a grid pattern. 12) Detail of a girdle band. Scale bars: 3=50 μm; 2, 4, 5=20 μm; 6=10 μm; 7, 9=5 μm; 8=2 μm; 10–12=1 μm.	FIGURES 2–12. Chaetoceros coarctatus, Chaetoceros dadayi, Chaetoceros danicus. Figs 2–6: LM. Figs 7, 9–12: TEM. Fig. 8: SEM. Figs 2–3: Chaetoceros coarctatus field material. 2) Middle part of a chain, note the narrow apertures and attached ciliate cells. 3) Terminal part of a chain showing the orientation of the setae. Arrows indicate plastids within the setae. Fig. 4: Chaetoceros dadayi field material. Complete chain with the attached tininnid lorica. Note the characteristic orientation of intercalary setae. Figs 5–12: Chaetoceros danicus culture material, strain PMFDA1. 5) Cell in valve view, note the cross orientation of the setae. 6) Chain of two cells in girdle view. 7) Valve view showing the fine structure. 8) Internal view of the valve. 9) Fine structure of the two overlaid valves with the siliceous thickenings on the valve margin (arrow) 10) Detail of a seta. 11) Single side of the seta with arrowhead spines and poroids arranged in a grid pattern. 12) Detail of a girdle band. Scale bars: 3=50 μm; 2, 4, 5=20 μm; 6=10 μm; 7, 9=5 μm; 8=2 μm; 10–12=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE514CFFEC6AE5FDA8DE0DFB42.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700776/files/figure.png	https://doi.org/10.5281/zenodo.13700776	FIGURES 13–23. Chaetoceros densus, Chaetoceros eibenii. Figs 13, 14, 16: LM. Figs 15, 20, 21: TEM. Figs 17–19, 22–23: SEM. Figs 13–15: Chaetoceros densus field material. 13) Terminal part of a chain. 14) Sibling valves in valve view. 15) Detail of a seta. Figs 16, 18–22: Chaetoceros eibenii culture material, strain PMFH1. 16) Complete chain of two cells. Fig. 17: Chaetoceros eibenii field material. 17) Terminal part of a chain showing wide hexagonal apertures and a rimoportula visible on every valve. 18) Valve view of sibling valves showing setae divergence. 19) External view of the valve with rimoportula and hyaline rim on the marginal ridge (arrows). 20) Detail of the seta. 21) Detail of a broken seta showing the ornamentation pattern of the side wall. The larger round poroid is indicated by an arrow. 22) Hexagonal cross-section of the seta. 23) Seta tip. Scale bars: 16= 50 μm; 13, 14, 17=10 μm; 18, 19=5 μm; 15, 20–23=1 μm.	FIGURES 13–23. Chaetoceros densus, Chaetoceros eibenii. Figs 13, 14, 16: LM. Figs 15, 20, 21: TEM. Figs 17–19, 22–23: SEM. Figs 13–15: Chaetoceros densus field material. 13) Terminal part of a chain. 14) Sibling valves in valve view. 15) Detail of a seta. Figs 16, 18–22: Chaetoceros eibenii culture material, strain PMFH1. 16) Complete chain of two cells. Fig. 17: Chaetoceros eibenii field material. 17) Terminal part of a chain showing wide hexagonal apertures and a rimoportula visible on every valve. 18) Valve view of sibling valves showing setae divergence. 19) External view of the valve with rimoportula and hyaline rim on the marginal ridge (arrows). 20) Detail of the seta. 21) Detail of a broken seta showing the ornamentation pattern of the side wall. The larger round poroid is indicated by an arrow. 22) Hexagonal cross-section of the seta. 23) Seta tip. Scale bars: 16= 50 μm; 13, 14, 17=10 μm; 18, 19=5 μm; 15, 20–23=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE514CFFEC6AE5FB1FD965F83D.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700776/files/figure.png	https://doi.org/10.5281/zenodo.13700776	FIGURES 13–23. Chaetoceros densus, Chaetoceros eibenii. Figs 13, 14, 16: LM. Figs 15, 20, 21: TEM. Figs 17–19, 22–23: SEM. Figs 13–15: Chaetoceros densus field material. 13) Terminal part of a chain. 14) Sibling valves in valve view. 15) Detail of a seta. Figs 16, 18–22: Chaetoceros eibenii culture material, strain PMFH1. 16) Complete chain of two cells. Fig. 17: Chaetoceros eibenii field material. 17) Terminal part of a chain showing wide hexagonal apertures and a rimoportula visible on every valve. 18) Valve view of sibling valves showing setae divergence. 19) External view of the valve with rimoportula and hyaline rim on the marginal ridge (arrows). 20) Detail of the seta. 21) Detail of a broken seta showing the ornamentation pattern of the side wall. The larger round poroid is indicated by an arrow. 22) Hexagonal cross-section of the seta. 23) Seta tip. Scale bars: 16= 50 μm; 13, 14, 17=10 μm; 18, 19=5 μm; 15, 20–23=1 μm.	FIGURES 13–23. Chaetoceros densus, Chaetoceros eibenii. Figs 13, 14, 16: LM. Figs 15, 20, 21: TEM. Figs 17–19, 22–23: SEM. Figs 13–15: Chaetoceros densus field material. 13) Terminal part of a chain. 14) Sibling valves in valve view. 15) Detail of a seta. Figs 16, 18–22: Chaetoceros eibenii culture material, strain PMFH1. 16) Complete chain of two cells. Fig. 17: Chaetoceros eibenii field material. 17) Terminal part of a chain showing wide hexagonal apertures and a rimoportula visible on every valve. 18) Valve view of sibling valves showing setae divergence. 19) External view of the valve with rimoportula and hyaline rim on the marginal ridge (arrows). 20) Detail of the seta. 21) Detail of a broken seta showing the ornamentation pattern of the side wall. The larger round poroid is indicated by an arrow. 22) Hexagonal cross-section of the seta. 23) Seta tip. Scale bars: 16= 50 μm; 13, 14, 17=10 μm; 18, 19=5 μm; 15, 20–23=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE514EFFEE6AE5FF55DE3EFCF1.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700778/files/figure.png	https://doi.org/10.5281/zenodo.13700778	FIGURES 24–32. Chaetoceros peruvianus, Chaetoceros pseudodichaeta. Figs 24–28: LM.Figs 29–30: SEM.Figs 31–32: TEM. Figs 24– 26: Chaetoceros peruvianus field material. 24) Single cell showing setae orientation. 25) Cell in girdle view. Note the tooth-like structure between the setae on the anterior valve (arrow). 26) Detail of seta with spines and chloroplasts. Figs 27–29: Chaetoceros pseudodichaeta field material. 27) Complete chain showing the typical three-dimensional setae orientation. Note the orientation of the terminal setae. 28) Terminal cell of the chain with the long tubular process. 29) Two sibling valves showing the fusion point of the setae which afterwards diverge in various directions. Note the hyaline rim on the valve edge (arrow). Figs 30–32: Chaetoceros pseudodichaeta, culture material strain PMFED1. 30) Valve with silica projections and rimoportula (arrow). 31) Valve face with the annulus, branching costae and few capilli (arrow). 32) Detail of a seta with large poroid marked with an arrow. Scale bars: 24=50 μm; 25, 27=20 μm; 28=10 μm; 29–31=2 μm; 26, 32= 1 μm.	FIGURES 24–32. Chaetoceros peruvianus, Chaetoceros pseudodichaeta. Figs 24–28: LM.Figs 29–30: SEM.Figs 31–32: TEM. Figs 24– 26: Chaetoceros peruvianus field material. 24) Single cell showing setae orientation. 25) Cell in girdle view. Note the tooth-like structure between the setae on the anterior valve (arrow). 26) Detail of seta with spines and chloroplasts. Figs 27–29: Chaetoceros pseudodichaeta field material. 27) Complete chain showing the typical three-dimensional setae orientation. Note the orientation of the terminal setae. 28) Terminal cell of the chain with the long tubular process. 29) Two sibling valves showing the fusion point of the setae which afterwards diverge in various directions. Note the hyaline rim on the valve edge (arrow). Figs 30–32: Chaetoceros pseudodichaeta, culture material strain PMFED1. 30) Valve with silica projections and rimoportula (arrow). 31) Valve face with the annulus, branching costae and few capilli (arrow). 32) Detail of a seta with large poroid marked with an arrow. Scale bars: 24=50 μm; 25, 27=20 μm; 28=10 μm; 29–31=2 μm; 26, 32= 1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE514EFFEE6AE5FC81DEA8F94D.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700778/files/figure.png	https://doi.org/10.5281/zenodo.13700778	FIGURES 24–32. Chaetoceros peruvianus, Chaetoceros pseudodichaeta. Figs 24–28: LM.Figs 29–30: SEM.Figs 31–32: TEM. Figs 24– 26: Chaetoceros peruvianus field material. 24) Single cell showing setae orientation. 25) Cell in girdle view. Note the tooth-like structure between the setae on the anterior valve (arrow). 26) Detail of seta with spines and chloroplasts. Figs 27–29: Chaetoceros pseudodichaeta field material. 27) Complete chain showing the typical three-dimensional setae orientation. Note the orientation of the terminal setae. 28) Terminal cell of the chain with the long tubular process. 29) Two sibling valves showing the fusion point of the setae which afterwards diverge in various directions. Note the hyaline rim on the valve edge (arrow). Figs 30–32: Chaetoceros pseudodichaeta, culture material strain PMFED1. 30) Valve with silica projections and rimoportula (arrow). 31) Valve face with the annulus, branching costae and few capilli (arrow). 32) Detail of a seta with large poroid marked with an arrow. Scale bars: 24=50 μm; 25, 27=20 μm; 28=10 μm; 29–31=2 μm; 26, 32= 1 μm.	FIGURES 24–32. Chaetoceros peruvianus, Chaetoceros pseudodichaeta. Figs 24–28: LM.Figs 29–30: SEM.Figs 31–32: TEM. Figs 24– 26: Chaetoceros peruvianus field material. 24) Single cell showing setae orientation. 25) Cell in girdle view. Note the tooth-like structure between the setae on the anterior valve (arrow). 26) Detail of seta with spines and chloroplasts. Figs 27–29: Chaetoceros pseudodichaeta field material. 27) Complete chain showing the typical three-dimensional setae orientation. Note the orientation of the terminal setae. 28) Terminal cell of the chain with the long tubular process. 29) Two sibling valves showing the fusion point of the setae which afterwards diverge in various directions. Note the hyaline rim on the valve edge (arrow). Figs 30–32: Chaetoceros pseudodichaeta, culture material strain PMFED1. 30) Valve with silica projections and rimoportula (arrow). 31) Valve face with the annulus, branching costae and few capilli (arrow). 32) Detail of a seta with large poroid marked with an arrow. Scale bars: 24=50 μm; 25, 27=20 μm; 28=10 μm; 29–31=2 μm; 26, 32= 1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE514EFFE96AE5F905DF61FCAD.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700780/files/figure.png	https://doi.org/10.5281/zenodo.13700780	FIGURES 33–41. Chaetoceros rostratus. Figs 33, 38–41: culture material, strain PMFR4. Figs 34–37: field material. Figs 33–35: LM. Figs 36–38: SEM. Figs 39–41: TEM. 33) A chain. 34) Terminal part of a chain. Note the absence of the linking spine in the terminal valve (arrow). 35) Two intercalary cells showing the presence of chloroplasts in cell body and setae. 36) Intercalary sibling valves connected with the linking spine and visible tube-like processes of rimoportulae (arrows). 37) Internal view of the intercalary valve showing the conical hole of the linking spine and the slit-like eccentric rimoportula (arrow). 38) Detail of a seta. 39) External view of the terminal valve showing the small tube-like eccentric process (arrow) and the fine structure of the valve face, mantle and bases of the setae. 40) Detail of a seta showing the ornamentation of the side wall with larger poroids on either side of the poroid rows (arrows). 41) Tetragonal cross section of the seta. Scale bars: 33, 34=20 μm; 35=10 μm; 36, 37=5 μm; 39 = 2 μm; 38, 40, 41=1 μm.	FIGURES 33–41. Chaetoceros rostratus. Figs 33, 38–41: culture material, strain PMFR4. Figs 34–37: field material. Figs 33–35: LM. Figs 36–38: SEM. Figs 39–41: TEM. 33) A chain. 34) Terminal part of a chain. Note the absence of the linking spine in the terminal valve (arrow). 35) Two intercalary cells showing the presence of chloroplasts in cell body and setae. 36) Intercalary sibling valves connected with the linking spine and visible tube-like processes of rimoportulae (arrows). 37) Internal view of the intercalary valve showing the conical hole of the linking spine and the slit-like eccentric rimoportula (arrow). 38) Detail of a seta. 39) External view of the terminal valve showing the small tube-like eccentric process (arrow) and the fine structure of the valve face, mantle and bases of the setae. 40) Detail of a seta showing the ornamentation of the side wall with larger poroids on either side of the poroid rows (arrows). 41) Tetragonal cross section of the seta. Scale bars: 33, 34=20 μm; 35=10 μm; 36, 37=5 μm; 39 = 2 μm; 38, 40, 41=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5149FFE96AE5FCA5DDA6F7C1.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700782/files/figure.png	https://doi.org/10.5281/zenodo.13700782	FIGURES 42–53. Chaetoceros affinis. Figs 42–43, 50–53: field material. Figs 44–53: culture material. Figs 44, 47–48: strain PMFE1. Figs 45–46, 49–53: strain PMFC2. Figs 42, 50: LM. Figs 43, 45–49, 51–53: SEM. Fig 44: TEM. 42) A chain. 43) Sibling valves with silica membrane covering the aperture. Note the row of pores on the point of fusion with the marginal ridge (arrow). 44) Sibling valves showing the silica membrane ruptured on one side. The arrow indicates central annulus. 45) Detail of the terminal valve with short capilli and marginal rim (arrow). 46) Detail of the terminal valve with short capilli and beak-like process (arrow). 47) Circular cross-section of the intercalary seta. 48) Detail of intercalary seta. 49) Detail of thick terminal seta. 50) Resting spores within parental cells. 51) Secondary valve of the resting spore with both dichotomously branching and simple long spines. Arrow shows the single ring of puncta on the advalvar margin. 52) Valve view on the resting spore (not certain if primary or secondary valve) showing surface covered with knobs and dichotomously branching spines. 53) Secondary valves of the resting spores in formation inside two sibling valves joined by the siliceous membrane. Note the single ring of puncta on the advalvar margin of the mantle (arrow). Scale bars: 42=20 μm; 50=10 μm; 43, 53=5 μm; 44, 51–52=2 μm; 45–46, 48–49=1 μm. 47=0.5 μm.	FIGURES 42–53. Chaetoceros affinis. Figs 42–43, 50–53: field material. Figs 44–53: culture material. Figs 44, 47–48: strain PMFE1. Figs 45–46, 49–53: strain PMFC2. Figs 42, 50: LM. Figs 43, 45–49, 51–53: SEM. Fig 44: TEM. 42) A chain. 43) Sibling valves with silica membrane covering the aperture. Note the row of pores on the point of fusion with the marginal ridge (arrow). 44) Sibling valves showing the silica membrane ruptured on one side. The arrow indicates central annulus. 45) Detail of the terminal valve with short capilli and marginal rim (arrow). 46) Detail of the terminal valve with short capilli and beak-like process (arrow). 47) Circular cross-section of the intercalary seta. 48) Detail of intercalary seta. 49) Detail of thick terminal seta. 50) Resting spores within parental cells. 51) Secondary valve of the resting spore with both dichotomously branching and simple long spines. Arrow shows the single ring of puncta on the advalvar margin. 52) Valve view on the resting spore (not certain if primary or secondary valve) showing surface covered with knobs and dichotomously branching spines. 53) Secondary valves of the resting spores in formation inside two sibling valves joined by the siliceous membrane. Note the single ring of puncta on the advalvar margin of the mantle (arrow). Scale bars: 42=20 μm; 50=10 μm; 43, 53=5 μm; 44, 51–52=2 μm; 45–46, 48–49=1 μm. 47=0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE514BFFF46AE5FF56DD9DFD39.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700784/files/figure.png	https://doi.org/10.5281/zenodo.13700784	FIGURES 54–62. Chaetoceros anastomosans. Culture material. Figs 54–55, 61: strain PMFAN2. Figs 56–60, 62: strain PMFAN1. Figs 54, 55: LM. Fig. 56: SEM. Figs 57–62: TEM. 54) A chain. 55) Middle part of a chain showing a cross-bridge connection between sibling cells and the wide octagonal aperture. 56) Sibling valves in valve view. 57) Cell in girdle view showing the hyaline rim at the mantle ridge (arrow). 58) Valve face showing the central annulus and dichotomously branching costae. 59) Slit-shaped rimoportula on a terminal valve. 60) Part of the girdle. 61) Cross-bridge between sibling setae.Arrow shows the elongated poroid perforating the setae. 62) Detail of a seta. Scale bars: 54=20 μm; 55=10 μm; 57, 60–61=2 μm; 56, 58=1 μm; 59, 62=0.5 μm.	FIGURES 54–62. Chaetoceros anastomosans. Culture material. Figs 54–55, 61: strain PMFAN2. Figs 56–60, 62: strain PMFAN1. Figs 54, 55: LM. Fig. 56: SEM. Figs 57–62: TEM. 54) A chain. 55) Middle part of a chain showing a cross-bridge connection between sibling cells and the wide octagonal aperture. 56) Sibling valves in valve view. 57) Cell in girdle view showing the hyaline rim at the mantle ridge (arrow). 58) Valve face showing the central annulus and dichotomously branching costae. 59) Slit-shaped rimoportula on a terminal valve. 60) Part of the girdle. 61) Cross-bridge between sibling setae.Arrow shows the elongated poroid perforating the setae. 62) Detail of a seta. Scale bars: 54=20 μm; 55=10 μm; 57, 60–61=2 μm; 56, 58=1 μm; 59, 62=0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5154FFF46AE5FCC9D9BAF94D.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700786/files/figure.png	https://doi.org/10.5281/zenodo.13700786	FIGURES 63–71. Chaetoceros brevis. Figs 63–64, 67–71: culture material, strain PMFB1. Figs 65–66: field material. Figs 63–65: LM. Figs 66, 68: SEM. Figs 67, 69–71: TEM. 63) A complete chain. 64) Middle part of a chain showing single plate-like chloroplasts and peanut-shaped apertures. 65) Terminal part of a chain with plastid-like material within the setae. 66) Resting spore still covered with the remains of the girdle bands from the parent cell. Primary valve ornamented with numerous thin filamentous spines. 67) Detail of the valve with externally flattened tube of the rimoportula. 68) Internal view of the terminal valve showing the slit-shaped rimoportula (arrow) and silica projections extending from the marginal ridge (arrowheads). 69) Intercalary valve face showing central annulus and radially arranged parallel costae. Note the darker area in the central part of the valve. 70) Part of a girdle with bands ornamented with transverse costae. Note the connecting band with marked undulation. 71) Detail of a seta. Scale bars: 63= 20 μm; 64–65=10 μm; 66, 68–69=5 μm; 67, 70–71=1 μm.	FIGURES 63–71. Chaetoceros brevis. Figs 63–64, 67–71: culture material, strain PMFB1. Figs 65–66: field material. Figs 63–65: LM. Figs 66, 68: SEM. Figs 67, 69–71: TEM. 63) A complete chain. 64) Middle part of a chain showing single plate-like chloroplasts and peanut-shaped apertures. 65) Terminal part of a chain with plastid-like material within the setae. 66) Resting spore still covered with the remains of the girdle bands from the parent cell. Primary valve ornamented with numerous thin filamentous spines. 67) Detail of the valve with externally flattened tube of the rimoportula. 68) Internal view of the terminal valve showing the slit-shaped rimoportula (arrow) and silica projections extending from the marginal ridge (arrowheads). 69) Intercalary valve face showing central annulus and radially arranged parallel costae. Note the darker area in the central part of the valve. 70) Part of a girdle with bands ornamented with transverse costae. Note the connecting band with marked undulation. 71) Detail of a seta. Scale bars: 63= 20 μm; 64–65=10 μm; 66, 68–69=5 μm; 67, 70–71=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5154FFF76AE5F905D8F4FE35.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700788/files/figure.png	https://doi.org/10.5281/zenodo.13700788	FIGURES 72–82. Chaetoceros circinalis, Chaetoceros constrictus. Figs 72–73, 79, 81: LM. Figs 74–75, 77–78, 80, 82: SEM. Fig 76: TEM. Figs 72–78 Chaetoceros circinalis culture material, strain PMFG4. 72) A complete chain and a single cell showing the curvature of the setae. 73) Valve view of a cell showing the characteristic curvature of the setae. 74) Two sibling valves with partially fused hyaline rim at the aperture edge (arrows). 75) Terminal valve with wide flattened tube-like rimoportula process and short capilli on the valve surface. 76) Terminal valve with wide flattened tube-like rimoportula process. 77) Detail of proximal part of intercalary setae showing elongated poroids (arrow). 78) Detail of a seta. Figs 79–82 Chaetoceros constrictus field material. 79) Short chain showing orientation of the setae. 80) Detail of a seta. 81) Intercalary cells in girdle view showing the distinct constrictions near the mantle margin (arrows). 82) Terminal cell showing external flattened tube of the rimoportula, the small spines covering the valve surface and longitudinal groove near the mantle edge. Scale bars: 79=20 μm; 72–73, 81–82=10 μm; 74–78, 80=1 μm.	FIGURES 72–82. Chaetoceros circinalis, Chaetoceros constrictus. Figs 72–73, 79, 81: LM. Figs 74–75, 77–78, 80, 82: SEM. Fig 76: TEM. Figs 72–78 Chaetoceros circinalis culture material, strain PMFG4. 72) A complete chain and a single cell showing the curvature of the setae. 73) Valve view of a cell showing the characteristic curvature of the setae. 74) Two sibling valves with partially fused hyaline rim at the aperture edge (arrows). 75) Terminal valve with wide flattened tube-like rimoportula process and short capilli on the valve surface. 76) Terminal valve with wide flattened tube-like rimoportula process. 77) Detail of proximal part of intercalary setae showing elongated poroids (arrow). 78) Detail of a seta. Figs 79–82 Chaetoceros constrictus field material. 79) Short chain showing orientation of the setae. 80) Detail of a seta. 81) Intercalary cells in girdle view showing the distinct constrictions near the mantle margin (arrows). 82) Terminal cell showing external flattened tube of the rimoportula, the small spines covering the valve surface and longitudinal groove near the mantle edge. Scale bars: 79=20 μm; 72–73, 81–82=10 μm; 74–78, 80=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5157FFF76AE5FDCDD9A3FB45.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700788/files/figure.png	https://doi.org/10.5281/zenodo.13700788	FIGURES 72–82. Chaetoceros circinalis, Chaetoceros constrictus. Figs 72–73, 79, 81: LM. Figs 74–75, 77–78, 80, 82: SEM. Fig 76: TEM. Figs 72–78 Chaetoceros circinalis culture material, strain PMFG4. 72) A complete chain and a single cell showing the curvature of the setae. 73) Valve view of a cell showing the characteristic curvature of the setae. 74) Two sibling valves with partially fused hyaline rim at the aperture edge (arrows). 75) Terminal valve with wide flattened tube-like rimoportula process and short capilli on the valve surface. 76) Terminal valve with wide flattened tube-like rimoportula process. 77) Detail of proximal part of intercalary setae showing elongated poroids (arrow). 78) Detail of a seta. Figs 79–82 Chaetoceros constrictus field material. 79) Short chain showing orientation of the setae. 80) Detail of a seta. 81) Intercalary cells in girdle view showing the distinct constrictions near the mantle margin (arrows). 82) Terminal cell showing external flattened tube of the rimoportula, the small spines covering the valve surface and longitudinal groove near the mantle edge. Scale bars: 79=20 μm; 72–73, 81–82=10 μm; 74–78, 80=1 μm.	FIGURES 72–82. Chaetoceros circinalis, Chaetoceros constrictus. Figs 72–73, 79, 81: LM. Figs 74–75, 77–78, 80, 82: SEM. Fig 76: TEM. Figs 72–78 Chaetoceros circinalis culture material, strain PMFG4. 72) A complete chain and a single cell showing the curvature of the setae. 73) Valve view of a cell showing the characteristic curvature of the setae. 74) Two sibling valves with partially fused hyaline rim at the aperture edge (arrows). 75) Terminal valve with wide flattened tube-like rimoportula process and short capilli on the valve surface. 76) Terminal valve with wide flattened tube-like rimoportula process. 77) Detail of proximal part of intercalary setae showing elongated poroids (arrow). 78) Detail of a seta. Figs 79–82 Chaetoceros constrictus field material. 79) Short chain showing orientation of the setae. 80) Detail of a seta. 81) Intercalary cells in girdle view showing the distinct constrictions near the mantle margin (arrows). 82) Terminal cell showing external flattened tube of the rimoportula, the small spines covering the valve surface and longitudinal groove near the mantle edge. Scale bars: 79=20 μm; 72–73, 81–82=10 μm; 74–78, 80=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5157FFF16AE5FB1DDDAEFEC9.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700790/files/figure.png	https://doi.org/10.5281/zenodo.13700790	FIGURES 83–94. Chaetoceros contortus. Figs 83–84, 88–92: culture material, strain PMFCO2. Fig. 93: strain PMFCO1. Figs 85–87: field material. Figs 83–86: LM. Figs 87–90, 92–94: TEM. Fig 91: SEM. 83) Complete chain showing orientation of the setae. 84) Middle part of a chain showing several small chloroplasts and typical hexagonal aperture. 85) Part of the chain with specialized intercalary setae. 86) Middle part of the chain with resting spores. 87) Valve face and mantle showing the reticulate area within the central annulus and small dots on the end of some costae (arrow). Note the hyaline rim with a rectangular projection (arrowhead). 88) Valve face with network of costae. 89) Sibling valves in valve view showing the hyaline rim on the marginal ridge. 90) Terminal valve with a club-like shaped external process of the rimoportula and rectangular siliceous projections (arrow). 91) Detail of the terminal valve with hole of the terminal process from the internal view. 92) Detail of a terminal valve with club-shaped rimoportula. 93) Detail of a girdle band. 94) Detail of a seta. Scale bars: 83=50 μm; 84–86=10 μm; 87, 89=2 μm; 88, 90–92, 94=1 μm; 93= 0.5 μm.	FIGURES 83–94. Chaetoceros contortus. Figs 83–84, 88–92: culture material, strain PMFCO2. Fig. 93: strain PMFCO1. Figs 85–87: field material. Figs 83–86: LM. Figs 87–90, 92–94: TEM. Fig 91: SEM. 83) Complete chain showing orientation of the setae. 84) Middle part of a chain showing several small chloroplasts and typical hexagonal aperture. 85) Part of the chain with specialized intercalary setae. 86) Middle part of the chain with resting spores. 87) Valve face and mantle showing the reticulate area within the central annulus and small dots on the end of some costae (arrow). Note the hyaline rim with a rectangular projection (arrowhead). 88) Valve face with network of costae. 89) Sibling valves in valve view showing the hyaline rim on the marginal ridge. 90) Terminal valve with a club-like shaped external process of the rimoportula and rectangular siliceous projections (arrow). 91) Detail of the terminal valve with hole of the terminal process from the internal view. 92) Detail of a terminal valve with club-shaped rimoportula. 93) Detail of a girdle band. 94) Detail of a seta. Scale bars: 83=50 μm; 84–86=10 μm; 87, 89=2 μm; 88, 90–92, 94=1 μm; 93= 0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5151FFF16AE5FE99DE5CFA6D.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700794/files/figure.png	https://doi.org/10.5281/zenodo.13700794	FIGURES 95–104. Chaetoceros costatus. Fig. 96: field material. Figs 95, 97–104: culture material. Figs 95, 99–100, 102: strain PMFB7. Figs 97–98: strain PMFB8. Figs 101, 103–104: strain PMFB6. Figs 95–96: LM. Figs 97–100, 102: TEM. Figs 101, 103–104: SEM. 95) Complete chain showing orientation of the setae. 96) Middle part of a chain showing the visible edges of the girdle bands (arrow). 97) Sibling valves, note the fusion of protuberances and sibling setae joining the cells. Arrow indicates hyaline rim on the marginal ridge. 98) Valve face of the terminal valve showing eccentric annulus and costae pattern. 99) External flattened tube of the rimoportula. 100) Slit-shaped aperture of the rimoportula. 101) Detail of a seta. 102) Girdle composed of half-bands with the thickened edges on advalvar bands. 103) Primary valve with hooked spines. The edge of the valve and the mantle are covered with silica membranes which appear to be remains of the girdle left from the parent cell. 104) Secondary valve with conical spines and single marginal ring of poroids. 95–96=10 μm; 97–98, 102, 103–104=2 μm; 99, 101= 0.5 μm.	FIGURES 95–104. Chaetoceros costatus. Fig. 96: field material. Figs 95, 97–104: culture material. Figs 95, 99–100, 102: strain PMFB7. Figs 97–98: strain PMFB8. Figs 101, 103–104: strain PMFB6. Figs 95–96: LM. Figs 97–100, 102: TEM. Figs 101, 103–104: SEM. 95) Complete chain showing orientation of the setae. 96) Middle part of a chain showing the visible edges of the girdle bands (arrow). 97) Sibling valves, note the fusion of protuberances and sibling setae joining the cells. Arrow indicates hyaline rim on the marginal ridge. 98) Valve face of the terminal valve showing eccentric annulus and costae pattern. 99) External flattened tube of the rimoportula. 100) Slit-shaped aperture of the rimoportula. 101) Detail of a seta. 102) Girdle composed of half-bands with the thickened edges on advalvar bands. 103) Primary valve with hooked spines. The edge of the valve and the mantle are covered with silica membranes which appear to be remains of the girdle left from the parent cell. 104) Secondary valve with conical spines and single marginal ring of poroids. 95–96=10 μm; 97–98, 102, 103–104=2 μm; 99, 101= 0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5151FFFC6AE5FA65DEC6F929.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700796/files/figure.png	https://doi.org/10.5281/zenodo.13700796	FIGURES 105–116. Chaetoceros curvisetus. Figs 105, 114: field material. Figs 106–113, 115–116: culture material. Figs 107, 109–112: strain PMFD2. Figs 108, 113, 115–116: strain PMFD6. Fig. 106: strain PMFD8. Figs 105–106, 114: LM. Figs 107, 109–112: TEM. Figs 108, 113, 115–116: SEM. 105)A chain in narrow girdle view showing orientation of the setae.106) Intercalary cells with a single plate-like chloroplast. 107) Detail of the valve showing the valve ornamentation pattern. The arrow shows a dot-like costa end. 108) Outside view of the terminal valve with the hyaline rim on the marginal ridge and external flattened tube of the rimoportula. 109) Detail of the valve with external flattened tube of the rimoportula. 110) Central annulus with the slit-like aperture of the rimoportula. 111) Detail of the girdle. 112) Detail of a girdle band with transverse ribs and the inter-rib areas perforated with poroids. 113) Detail of a seta. 114) A cell with the resting spore. 115) Internal view of the resting spore primary valve with the fissured collar. 116) External view of the resting spore perforated by poroids. Scale bars: 105=20 μm; 106, 114=10 μm; 108, 115–116=5 μm; 107, 109–113=1 μm.	FIGURES 105–116. Chaetoceros curvisetus. Figs 105, 114: field material. Figs 106–113, 115–116: culture material. Figs 107, 109–112: strain PMFD2. Figs 108, 113, 115–116: strain PMFD6. Fig. 106: strain PMFD8. Figs 105–106, 114: LM. Figs 107, 109–112: TEM. Figs 108, 113, 115–116: SEM. 105)A chain in narrow girdle view showing orientation of the setae.106) Intercalary cells with a single plate-like chloroplast. 107) Detail of the valve showing the valve ornamentation pattern. The arrow shows a dot-like costa end. 108) Outside view of the terminal valve with the hyaline rim on the marginal ridge and external flattened tube of the rimoportula. 109) Detail of the valve with external flattened tube of the rimoportula. 110) Central annulus with the slit-like aperture of the rimoportula. 111) Detail of the girdle. 112) Detail of a girdle band with transverse ribs and the inter-rib areas perforated with poroids. 113) Detail of a seta. 114) A cell with the resting spore. 115) Internal view of the resting spore primary valve with the fissured collar. 116) External view of the resting spore perforated by poroids. Scale bars: 105=20 μm; 106, 114=10 μm; 108, 115–116=5 μm; 107, 109–113=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5151FFFC6AE5FA65DEC6F929.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700802/files/figure.png	https://doi.org/10.5281/zenodo.13700802	FIGURES 117–127. Chaetoceros decipiens. Fig.118: field material.Figs 119–127: cultured material. Figs 119, 123, 126: strain PMFDE1. Figs 120, 122: strain PMFDE3. Figs 117, 121, 124–125, 127: strain PMFE1. Figs 117–119: LM. Figs 120, 123–126: TEM. Figs 121, 122, 127: SEM. 118) Complete chain showing orientation of the setae. 118) Intercalary cells with the organic structures projecting from the girdle (arrows). 119) Cells with several chloroplasts. 120) Sibling valves joined by setae fusion and slice-shaped hyaline silica projections (black arrowheads) from the rim on the marginal ridge (arrow). Siliceous fringes extend from the mantle (white arrowheads). 121) Terminal valve with slice-shaped silica projection (arrowheads) and small external protrusion of the rimoportula (arrow). 122) Terminal valve with no visible external part of the rimoportula. 123) Detail of the terminal valve with rimoportula. 124) Detail of the terminal valve with rimoportula within the central annulus. 125) Detail of broken girdle bands. 126) Detail of a seta. 127) Seta tip. Scale bars: 117, 118=20 μm; 119=10 μm; 122=5 μm; 120=2 μm; 121, 125–127=1 μm; 123–124=0.5 μm.	FIGURES 117–127. Chaetoceros decipiens. Fig.118: field material.Figs 119–127: cultured material. Figs 119, 123, 126: strain PMFDE1. Figs 120, 122: strain PMFDE3. Figs 117, 121, 124–125, 127: strain PMFE1. Figs 117–119: LM. Figs 120, 123–126: TEM. Figs 121, 122, 127: SEM. 118) Complete chain showing orientation of the setae. 118) Intercalary cells with the organic structures projecting from the girdle (arrows). 119) Cells with several chloroplasts. 120) Sibling valves joined by setae fusion and slice-shaped hyaline silica projections (black arrowheads) from the rim on the marginal ridge (arrow). Siliceous fringes extend from the mantle (white arrowheads). 121) Terminal valve with slice-shaped silica projection (arrowheads) and small external protrusion of the rimoportula (arrow). 122) Terminal valve with no visible external part of the rimoportula. 123) Detail of the terminal valve with rimoportula. 124) Detail of the terminal valve with rimoportula within the central annulus. 125) Detail of broken girdle bands. 126) Detail of a seta. 127) Seta tip. Scale bars: 117, 118=20 μm; 119=10 μm; 122=5 μm; 120=2 μm; 121, 125–127=1 μm; 123–124=0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE515CFFFF6AE5F939DF66FD15.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700804/files/figure.png	https://doi.org/10.5281/zenodo.13700804	FIGURES 128–141. Chaetoceros didymus, Chaetoceros diversus. Figs 128–130, 133–134: LM. Fig 131–132, 135, 138–139, 141: TEM. Figs 136–137, 140: SEM. Figs 128–132: Chaetoceros didymus field material. 128) Complete chain showing orientation of the setae. 129) Intercalary cells with two chloroplasts. 130) Valve view of the sibling valves with capilli. 131) Intercalary valve showing valve ornamentation. 132) Detail of a seta. Figs 133–134: Chaetoceros diversus field material. Figs 135–141 Chaetoceros diversus cultured material, strain PMFDIV1.133) Complete chain with special setae.134) Cells with a single chloroplast.135) Two overlapped sibling valves showing valve ornamentation.136) Sibling valves with fused projections (arrows). 137) External small projection of the rimoportula. 138) Rimoportula. 139) Detail of special intercalary seta. 140) Detail of a common seta. 141) Detail of the girdle band. Scale bars: 128, 133=20 μm; 129–130, 134=10 μm; 131=5 μm; 135–136, 138–141=1 μm; 132, 137=0.5 μm.	FIGURES 128–141. Chaetoceros didymus, Chaetoceros diversus. Figs 128–130, 133–134: LM. Fig 131–132, 135, 138–139, 141: TEM. Figs 136–137, 140: SEM. Figs 128–132: Chaetoceros didymus field material. 128) Complete chain showing orientation of the setae. 129) Intercalary cells with two chloroplasts. 130) Valve view of the sibling valves with capilli. 131) Intercalary valve showing valve ornamentation. 132) Detail of a seta. Figs 133–134: Chaetoceros diversus field material. Figs 135–141 Chaetoceros diversus cultured material, strain PMFDIV1.133) Complete chain with special setae.134) Cells with a single chloroplast.135) Two overlapped sibling valves showing valve ornamentation.136) Sibling valves with fused projections (arrows). 137) External small projection of the rimoportula. 138) Rimoportula. 139) Detail of special intercalary seta. 140) Detail of a common seta. 141) Detail of the girdle band. Scale bars: 128, 133=20 μm; 129–130, 134=10 μm; 131=5 μm; 135–136, 138–141=1 μm; 132, 137=0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE515FFFFF6AE5FCEDDEEFF929.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700804/files/figure.png	https://doi.org/10.5281/zenodo.13700804	FIGURES 128–141. Chaetoceros didymus, Chaetoceros diversus. Figs 128–130, 133–134: LM. Fig 131–132, 135, 138–139, 141: TEM. Figs 136–137, 140: SEM. Figs 128–132: Chaetoceros didymus field material. 128) Complete chain showing orientation of the setae. 129) Intercalary cells with two chloroplasts. 130) Valve view of the sibling valves with capilli. 131) Intercalary valve showing valve ornamentation. 132) Detail of a seta. Figs 133–134: Chaetoceros diversus field material. Figs 135–141 Chaetoceros diversus cultured material, strain PMFDIV1.133) Complete chain with special setae.134) Cells with a single chloroplast.135) Two overlapped sibling valves showing valve ornamentation.136) Sibling valves with fused projections (arrows). 137) External small projection of the rimoportula. 138) Rimoportula. 139) Detail of special intercalary seta. 140) Detail of a common seta. 141) Detail of the girdle band. Scale bars: 128, 133=20 μm; 129–130, 134=10 μm; 131=5 μm; 135–136, 138–141=1 μm; 132, 137=0.5 μm.	FIGURES 128–141. Chaetoceros didymus, Chaetoceros diversus. Figs 128–130, 133–134: LM. Fig 131–132, 135, 138–139, 141: TEM. Figs 136–137, 140: SEM. Figs 128–132: Chaetoceros didymus field material. 128) Complete chain showing orientation of the setae. 129) Intercalary cells with two chloroplasts. 130) Valve view of the sibling valves with capilli. 131) Intercalary valve showing valve ornamentation. 132) Detail of a seta. Figs 133–134: Chaetoceros diversus field material. Figs 135–141 Chaetoceros diversus cultured material, strain PMFDIV1.133) Complete chain with special setae.134) Cells with a single chloroplast.135) Two overlapped sibling valves showing valve ornamentation.136) Sibling valves with fused projections (arrows). 137) External small projection of the rimoportula. 138) Rimoportula. 139) Detail of special intercalary seta. 140) Detail of a common seta. 141) Detail of the girdle band. Scale bars: 128, 133=20 μm; 129–130, 134=10 μm; 131=5 μm; 135–136, 138–141=1 μm; 132, 137=0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE515FFFF96AE5F939DF9EFC65.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700806/files/figure.png	https://doi.org/10.5281/zenodo.13700806	FIGURES 142–153. Chaetoceros lauderi culture material, strain PMFL1. Figs 142–143, 151: LM. Figs 144–146, 148, 150: TEM. Figs 147, 149, 152–153: SEM. 142) Complete chain showing setae orientation. 143) Intercalary cells with numerous chloroplasts. 144) Two overlapped sibling valves showing valve ornamentation.145) Detail of the valve with central annulus and anastomosing ribs.146) Terminal valve with slit-like rimoportula (arrow). Note the parallel ribs on the valve mantle. 147) Terminal valve with external flattened tube of the rimoportula. Note the low hyaline rim on the marginal ridge. 148) Detail of the terminal valve with the slit-like rimoportula. 149) Detail of a seta. 150) Detail of the girdle band. 151) Resting spore. Note the single ring of puncta on the advalvar margin of the secondary valve mantle (arrow). 152) Primary valve of the resting spore. 153) Secondary valve of the resting spore with the single ring of puncta on the advalvar mantle margin. Scale bars: 142=50 μm; 143=20 μm; 151–153=10 μm; 144, 146–147=5 μm; 145, 148–150=1 μm.	FIGURES 142–153. Chaetoceros lauderi culture material, strain PMFL1. Figs 142–143, 151: LM. Figs 144–146, 148, 150: TEM. Figs 147, 149, 152–153: SEM. 142) Complete chain showing setae orientation. 143) Intercalary cells with numerous chloroplasts. 144) Two overlapped sibling valves showing valve ornamentation.145) Detail of the valve with central annulus and anastomosing ribs.146) Terminal valve with slit-like rimoportula (arrow). Note the parallel ribs on the valve mantle. 147) Terminal valve with external flattened tube of the rimoportula. Note the low hyaline rim on the marginal ridge. 148) Detail of the terminal valve with the slit-like rimoportula. 149) Detail of a seta. 150) Detail of the girdle band. 151) Resting spore. Note the single ring of puncta on the advalvar margin of the secondary valve mantle (arrow). 152) Primary valve of the resting spore. 153) Secondary valve of the resting spore with the single ring of puncta on the advalvar mantle margin. Scale bars: 142=50 μm; 143=20 μm; 151–153=10 μm; 144, 146–147=5 μm; 145, 148–150=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5159FFF96AE5FC7DDEDCFA01.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700808/files/figure.png	https://doi.org/10.5281/zenodo.13700808	FIGURES 154–161. Chaetoceros messanensis, Chaetoceros protuberans, Chaetoceros pseudocurvisetus. Figs 154–157, 160–161: LM. Figs 158–159: SEM. Figs 154–155: Chaetoceros messanensis field material. 154) Complete chain with special forked intercalary setae. 155) Terminal part of the chain showing wide, hexagonal apertures and different orientation of the two terminal setae. Figs 156– 159: Chaetoceros protuberans field material. 156) Terminal part of a chain. 157) Sibling valves. 158) Sibling valves, note the poroids perforating the valve surface. 159) Detail of a seta. Figs 160–161: Chaetoceros pseudocurvisetus field material. 160) Middle part of the chain showing orientation of the setae. 161) Intercalary cells showing the short distinctive aperture (arrow). Scale bars: 154–156, 160=20 μm; 157, 161=10 μm; 158=5 μm; 159=0.5 μm.	FIGURES 154–161. Chaetoceros messanensis, Chaetoceros protuberans, Chaetoceros pseudocurvisetus. Figs 154–157, 160–161: LM. Figs 158–159: SEM. Figs 154–155: Chaetoceros messanensis field material. 154) Complete chain with special forked intercalary setae. 155) Terminal part of the chain showing wide, hexagonal apertures and different orientation of the two terminal setae. Figs 156– 159: Chaetoceros protuberans field material. 156) Terminal part of a chain. 157) Sibling valves. 158) Sibling valves, note the poroids perforating the valve surface. 159) Detail of a seta. Figs 160–161: Chaetoceros pseudocurvisetus field material. 160) Middle part of the chain showing orientation of the setae. 161) Intercalary cells showing the short distinctive aperture (arrow). Scale bars: 154–156, 160=20 μm; 157, 161=10 μm; 158=5 μm; 159=0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5159FFFA6AE5F9D1DE31F858.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700808/files/figure.png	https://doi.org/10.5281/zenodo.13700808	FIGURES 154–161. Chaetoceros messanensis, Chaetoceros protuberans, Chaetoceros pseudocurvisetus. Figs 154–157, 160–161: LM. Figs 158–159: SEM. Figs 154–155: Chaetoceros messanensis field material. 154) Complete chain with special forked intercalary setae. 155) Terminal part of the chain showing wide, hexagonal apertures and different orientation of the two terminal setae. Figs 156– 159: Chaetoceros protuberans field material. 156) Terminal part of a chain. 157) Sibling valves. 158) Sibling valves, note the poroids perforating the valve surface. 159) Detail of a seta. Figs 160–161: Chaetoceros pseudocurvisetus field material. 160) Middle part of the chain showing orientation of the setae. 161) Intercalary cells showing the short distinctive aperture (arrow). Scale bars: 154–156, 160=20 μm; 157, 161=10 μm; 158=5 μm; 159=0.5 μm.	FIGURES 154–161. Chaetoceros messanensis, Chaetoceros protuberans, Chaetoceros pseudocurvisetus. Figs 154–157, 160–161: LM. Figs 158–159: SEM. Figs 154–155: Chaetoceros messanensis field material. 154) Complete chain with special forked intercalary setae. 155) Terminal part of the chain showing wide, hexagonal apertures and different orientation of the two terminal setae. Figs 156– 159: Chaetoceros protuberans field material. 156) Terminal part of a chain. 157) Sibling valves. 158) Sibling valves, note the poroids perforating the valve surface. 159) Detail of a seta. Figs 160–161: Chaetoceros pseudocurvisetus field material. 160) Middle part of the chain showing orientation of the setae. 161) Intercalary cells showing the short distinctive aperture (arrow). Scale bars: 154–156, 160=20 μm; 157, 161=10 μm; 158=5 μm; 159=0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE515BFFFB6AE5FF56DC09FD60.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700808/files/figure.png	https://doi.org/10.5281/zenodo.13700808	FIGURES 154–161. Chaetoceros messanensis, Chaetoceros protuberans, Chaetoceros pseudocurvisetus. Figs 154–157, 160–161: LM. Figs 158–159: SEM. Figs 154–155: Chaetoceros messanensis field material. 154) Complete chain with special forked intercalary setae. 155) Terminal part of the chain showing wide, hexagonal apertures and different orientation of the two terminal setae. Figs 156– 159: Chaetoceros protuberans field material. 156) Terminal part of a chain. 157) Sibling valves. 158) Sibling valves, note the poroids perforating the valve surface. 159) Detail of a seta. Figs 160–161: Chaetoceros pseudocurvisetus field material. 160) Middle part of the chain showing orientation of the setae. 161) Intercalary cells showing the short distinctive aperture (arrow). Scale bars: 154–156, 160=20 μm; 157, 161=10 μm; 158=5 μm; 159=0.5 μm.	FIGURES 154–161. Chaetoceros messanensis, Chaetoceros protuberans, Chaetoceros pseudocurvisetus. Figs 154–157, 160–161: LM. Figs 158–159: SEM. Figs 154–155: Chaetoceros messanensis field material. 154) Complete chain with special forked intercalary setae. 155) Terminal part of the chain showing wide, hexagonal apertures and different orientation of the two terminal setae. Figs 156– 159: Chaetoceros protuberans field material. 156) Terminal part of a chain. 157) Sibling valves. 158) Sibling valves, note the poroids perforating the valve surface. 159) Detail of a seta. Figs 160–161: Chaetoceros pseudocurvisetus field material. 160) Middle part of the chain showing orientation of the setae. 161) Intercalary cells showing the short distinctive aperture (arrow). Scale bars: 154–156, 160=20 μm; 157, 161=10 μm; 158=5 μm; 159=0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE515BFFFB6AE5FD72DCF0F8DC.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700810/files/figure.png	https://doi.org/10.5281/zenodo.13700810	FIGURES 162–172. Chaetoceros socialis from culture material. Figs 162–163, 165: strain PMFA3. Figs 164, 166–169, 172: strain PMFA6. Figs 170–171 strain PMFA7. Figs 162–165: LM. Figs 166, 170–172: SEM. Figs 167–169: TEM. 162) A spherical colony. 163) Three curved chains connected with the long setae.164) Middle part of a chain with the resting spores within the parents cells. 165) Middle part of a chain showing the apertures. 166) Sibling valves in valve view showing the orientation of the setae. 167) Detail of the valve with the ornamentation pattern. 168) Intercalary valve in the girdle view. 169) Detail of a seta. Note the elongated poroid (arrow). 170) Complete resting spore. 171) Primary valve of the resting spore. 172) Secondary valve of the resting spore. Note the ring of puncta on the advalvar mantle margin (arrow). Scale bars: 162, 163=50 μm; 164=20 μm; 165=10 μm 166–168=2 μm; 170–172=1 μm; 169=0.5 μm.	FIGURES 162–172. Chaetoceros socialis from culture material. Figs 162–163, 165: strain PMFA3. Figs 164, 166–169, 172: strain PMFA6. Figs 170–171 strain PMFA7. Figs 162–165: LM. Figs 166, 170–172: SEM. Figs 167–169: TEM. 162) A spherical colony. 163) Three curved chains connected with the long setae.164) Middle part of a chain with the resting spores within the parents cells. 165) Middle part of a chain showing the apertures. 166) Sibling valves in valve view showing the orientation of the setae. 167) Detail of the valve with the ornamentation pattern. 168) Intercalary valve in the girdle view. 169) Detail of a seta. Note the elongated poroid (arrow). 170) Complete resting spore. 171) Primary valve of the resting spore. 172) Secondary valve of the resting spore. Note the ring of puncta on the advalvar mantle margin (arrow). Scale bars: 162, 163=50 μm; 164=20 μm; 165=10 μm 166–168=2 μm; 170–172=1 μm; 169=0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5165FFC66AE5FF56D8E3FD61.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700812/files/figure.png	https://doi.org/10.5281/zenodo.13700812	FIGURES 173–182. Chaetoceros tortissimus. Figs 174–175, 178: field material. Figs 173, 176–177, 179–182: culture material, strain PMFT1. Figs 173–176: LM. Figs 177–178, 181–182: TEM. Figs: 179–180: SEM. 173) Complete chain with a slight torsion showing orientation of the setae. 174) Complete chain composed of cells with short pervalvar size strongly twisted around the chain axis. 175) Middle part of a chain showing hexagonal apertures. 176) Intercalary cells with one parietal plate-like chloroplast positioned around the girdle. 177) Detail of the valve face with network of costae some ending in round spots (arrow). 178) Two overlapping sibling valves showing the valve ornamentation and the elongated pores near the bases of the setae (arrows). 179) Sibling valves with the elongated pores (arrows). 180) Detail of the proximal part of the seta with the large elongated pore. 181) Detail of the girdle band. 182) Detail of a seta. Scale bars: 173–175=20 μm; 176=10 μm; 178, 179=5 μm; 177=2 μm; 180–182=0.5 μm.	FIGURES 173–182. Chaetoceros tortissimus. Figs 174–175, 178: field material. Figs 173, 176–177, 179–182: culture material, strain PMFT1. Figs 173–176: LM. Figs 177–178, 181–182: TEM. Figs: 179–180: SEM. 173) Complete chain with a slight torsion showing orientation of the setae. 174) Complete chain composed of cells with short pervalvar size strongly twisted around the chain axis. 175) Middle part of a chain showing hexagonal apertures. 176) Intercalary cells with one parietal plate-like chloroplast positioned around the girdle. 177) Detail of the valve face with network of costae some ending in round spots (arrow). 178) Two overlapping sibling valves showing the valve ornamentation and the elongated pores near the bases of the setae (arrows). 179) Sibling valves with the elongated pores (arrows). 180) Detail of the proximal part of the seta with the large elongated pore. 181) Detail of the girdle band. 182) Detail of a seta. Scale bars: 173–175=20 μm; 176=10 μm; 178, 179=5 μm; 177=2 μm; 180–182=0.5 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5166FFC66AE5FD71DF85F905.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700814/files/figure.png	https://doi.org/10.5281/zenodo.13700814	FIGURES 183–194. Chaetoceros vixvisibilis field material. Figs 183–185, 191–192: LM. Figs 186–189, 193: TEM. Figs 190, 194: SEM. 183) Middle part of a chain with broken setae. 184, 185) Intercalary cells with the narrow aperture. 186) Intercalary valve showing valve ornamentation with central annulus and ends of costae twisted in small spirals. 187) Detail of terminal valve with central annulus and rimoportula. 188) Detail of the girdle. 189, 190) Details of setae, note the absence of spines. 191, 192) Resting spores within parent cells with different number of dichotomously branched spines. 193) Resting spore with two branched spines. 194) Open resting spore, secondary valve has a single ring of puncta on the advalvar margin (arrow). Scale bars: 183=20 μm, 184–185, 191–192=10 μm; 186, 193–194=2 μm; 187–190=1 μm.	FIGURES 183–194. Chaetoceros vixvisibilis field material. Figs 183–185, 191–192: LM. Figs 186–189, 193: TEM. Figs 190, 194: SEM. 183) Middle part of a chain with broken setae. 184, 185) Intercalary cells with the narrow aperture. 186) Intercalary valve showing valve ornamentation with central annulus and ends of costae twisted in small spirals. 187) Detail of terminal valve with central annulus and rimoportula. 188) Detail of the girdle. 189, 190) Details of setae, note the absence of spines. 191, 192) Resting spores within parent cells with different number of dichotomously branched spines. 193) Resting spore with two branched spines. 194) Open resting spore, secondary valve has a single ring of puncta on the advalvar margin (arrow). Scale bars: 183=20 μm, 184–185, 191–192=10 μm; 186, 193–194=2 μm; 187–190=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
038587FE5166FFC06AE5F8DDDC4DF7E3.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/13700816/files/figure.png	https://doi.org/10.5281/zenodo.13700816	FIGURES 195–198. Chaetoceros bacteriastroides field material. Figs 195–196: LM. Figs 197–198: SEM. 195) Complete chain showing orientation of the setae. Arrow shows the reduced undulated setae. 196) Terminal part of the chain with cells containing numerous chloroplasts and coiled setae (arrow). 197) Sibling valves in girdle view showing two pairs of reduced coiled setae and two fused parts of common intercalary setae.Arrow points to the shoehorn shaped outgrowth on the valve edge. 198) Detail of the intercalary common setae with small spines (arrowhead) and spirally undulated setae with T-shaped spines (arrow). Scale bars: 195=20 μm; 196=10 μm; 197=5 μm; 198=1 μm.	FIGURES 195–198. Chaetoceros bacteriastroides field material. Figs 195–196: LM. Figs 197–198: SEM. 195) Complete chain showing orientation of the setae. Arrow shows the reduced undulated setae. 196) Terminal part of the chain with cells containing numerous chloroplasts and coiled setae (arrow). 197) Sibling valves in girdle view showing two pairs of reduced coiled setae and two fused parts of common intercalary setae.Arrow points to the shoehorn shaped outgrowth on the valve edge. 198) Detail of the intercalary common setae with small spines (arrowhead) and spirally undulated setae with T-shaped spines (arrow). Scale bars: 195=20 μm; 196=10 μm; 197=5 μm; 198=1 μm.	2017-07-21	Bosak, Sunčica;Sarno, Diana		Zenodo	biologists	Bosak, Sunčica;Sarno, Diana			
