taxonID	type	description	language	source
BE0787D3FF93E645FF49FF64FF1F3F72.taxon	description	Figs 1, 3 – 10, 21	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
BE0787D3FF93E645FF49FF64FF1F3F72.taxon	materials_examined	Type material. Holotype: subadult female, E China. Zhejiang province. Lin’an city. Near Gongchen Mts., 220 m alt., N 30 ° 13.779 ', E 119 ° 43.716 '. Mosses on large rock among agricultural lands, northern exposition, 10. IV. 2008, leg. M. Potapov, 15 paratypes: from the same place. Holotype and 6 paratypes are deposited in the Shanghai Entomological Museum, CAS (Shanghai, China), 9 paratypes – – in Moscow State Pedagogical University (Moscow, Russia).	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
BE0787D3FF93E645FF49FF64FF1F3F72.taxon	description	Description. Body length from 1.2 mm (adult male) to 1.5 mm (the largest subadult female). Body cylindrical (Fig. 1). Coloration bluish, not very dark, antennae with or without pigment. Polygons of cuticular reticulation well developed. The biggest polygons located at posterior edge of head and on Abd. IV and V (Fig. 21), often elongated and much larger than mesochaeta socket. Canals between polygons well marked. No smooth fields. Dorsal mesochaetae long, not shortened in axial part of tergites, in posterior row of Abd. IV equal to other parts of body (Md: p 1 = 1.5 – 1.9). Abd. IV with p 3 longer than p 1 (1.2 – 1.6) (Fig. 8). Macrochaetae not very long, acuminate or slightly blunt apically. 8 + 8 ocelli, G and H reduced (dA: dH = 1.6 – 2.0). PAO 2.0 – 2.5 times longer than ocellus A. Chaeta s’ of Ant. III in males absent. 4 prelabral chaetae. Outer maxillary lobe with 4 sublobal hairs and simple maxillary palp. Labium with complete set of guards [A (1) B (4) C (0) D (4) E (7)], 3 proximal and 4 basomedian chaetae. 4 + 4 postlabial chaetae. 5 – 6 pp-chaetae between medial line and p 3 on head. Frontal chaeta ap present. Body chaetotaxy rather abundant (Fig. 4). Axial chaetotaxy 12 – 14,10 / 8 (6), 8 (6), 8,6 (8), often asymmetric. Macrochaetotaxy: 1,1 / 1,1,2 (see Remarks) (Figs 3, 4). Corner mesochaetae on Th. II and III not stronger than other mesochaetae of p-row. Number of s-chaetae: 3,3 / 2,2,2,2,4 (s), 1,1 / 1,1,1 (ms) (Fig. 3). S-chaetae of medium size, medial ones on Abd. III arranged lateral to Mdl macrochaetae. Lateral s-chaetae on Abd. IV between p 3 chaetae and Mp macrochaetae (Figs 3, 8). Sternite of Th. III without chaetae. Coxa I without an external chaeta. Tibiotarsi with 1,2,2 long and slightly clavate dorsal tenent hairs and 1,1,0 enlarged ventral tenent hairs. In fully adult males (ejaculatory duct well visible) chaeta B 5 and X on tibiotarsi III thickened and considerably expanded in proximal half (Fig. 9). Tibiotarsi I and II with 21 chaetae each, III with 25 chaetae (Fig. 10). Claw without teeth. Empodial appendage about half of inner edge of claw in length (0.5 – 0.6). Ventral tube with 3 + 3 lateral and 4 posterior chaetae. Retinaculum with 4 + 4 teeth and 1 chaeta. Anterior furcal subcoxa with 8 – 9 chaetae, posterior one with 6 – 7 chaetae. Manubrium with 14 – 16 + 14 – 16 dorsal chaetae, including 3 + 3 basal. With a pair of chaetae on lateral sides (sometimes absent on one side) (Fig. 7). Mucro bidentate. Dens with 1 anterior and 7 posterior chaetae, with clear humps on posterior side (Figs 5, 6). Dens: claw III = 2.9 – 3.3. Manubrium: dens: mucro = 8 – 11: 6 – 8: 1. Anal spines parallel, large, on normal papillae. Medial mesochaetae (a 1) of Abd. V slightly anterior to medial macrochaetae (a 2) (Fig. 8). Arrangement of chaetae and spines on dorsum of Abd. V as a 2 - a 2: a 1 - a 1 = ~ 2.3; a 2 - a 2 / a 2 - ASe = ~ 1.9. Males present.	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
BE0787D3FF93E645FF49FF64FF1F3F72.taxon	discussion	Remarks. The new species belongs to ' sylvatica ' group and differs from all species of the genus by complete absence of both Md and Mdl macrochaetae on Th. II – III and Abd. I – II (formula 1,1 / 1,1, ...). The specific position of lateral s-chaetae on Abd. IV (Fig. 8) is especially remarkable in T. dorsoduplex sp. nov. It seems likely that these schaetae are positioned posterior to Ml and lateral to Mp in all other species of Tetracanthella, this pattern can be inferred from the descriptions in which this character is pictured, e. g., after the illustrations of the monograph of Deharveng (1987). In T. dorsoduplex sp. nov. lateral s-chaetae are placed between p 3 chaetae and Mp macrochaetae and so both medial and lateral s-chaetae are set on dorsal side of tergite. In other characters (mouth parts, furca, cuticle reticulation, tibiotarsi) the new species is closely related to T. sylvatica Yosii, 1939. After redescription of the species by Deharveng (1987) and our observations of specimens from Japan (Honshu, Kyoto, leg. S. Fujii), T. sylvatica has Md and Mdl macrochaetae on Th. II, III and Abd. I, II, respectively (formula 2,2 / 2,2, ...) and normal position of lateral s-chaetae on Abd. IV (Fig. 11).	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
BE0787D3FF93E645FF49FF64FF1F3F72.taxon	distribution	Distribution. T. dorsoduplex sp. nov. is known only from type locality which is the most southern record for the genus in Asia.	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
BE0787D3FF93E645FF49FF64FF1F3F72.taxon	etymology	Derivatio nominis. The species is characterized with doublet (duplex) of dorsal s-chaetae on each side of Abd. IV.	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
BE0787D3FF97E641FF49FA61FC3438EA.taxon	description	Figs 2, 12 – 20, 22, 23	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
BE0787D3FF97E641FF49FA61FC3438EA.taxon	materials_examined	Type material. Holotype: female, China. Jilin province. Changbai Mts., 141.75801 ° N 127.93890 ° E, 1700 m alt., 13. IX. 2015, 10 cm deep coniferous forest soil, leg. Donghui Wu; paratypes: 1 paratype collected on 15. V. 2015 and 3 paratypes on 05. VIII. 2009 from the same site. Holotype and 2 paratypes are deposited in Northeast Institute of Geography and Agroecology, CAS (Changchun, China), 2 paratypes – – in Moscow State Pedagogical University (Moscow, Russia).	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
BE0787D3FF97E641FF49FA61FC3438EA.taxon	description	Description. Body length about 1.6 mm (based on largest subadult male and female specimens). Body rather broad. Coloration spotty, dark. Antennae unpigmented, with dark tips (Fig. 23). The largest polygons of cuticular reticulation subequal to mesochaeta socket (Fig. 22). Canals between polygons well marked, smooth fields absent. Dorsal mesochaetae of medium size, not shortened in axial part of tergites, in posterior row of Abd. IV longer than on other parts of body (Md / p 1 = 1.2 – 1.3). Abd. IV with p 3 slightly longer than p 1 (1.1 – 1.3). Macrochaetae middlesized and acuminate. 8 + 8 ocelli, G and H reduced (dcA: dcH = 1.5 – 2.0). PAO short, about 2.2 – 2.5 times longer than ocellus A. 4 prelabral chaetae. Outer maxillary lobe with 4 sublobal hairs and simple maxillary palp. Labium with complete set of guards [A (1) B (4) C (0) D (4) E (7)], papilla E with 7 guards (e 7 present), 3 proximal and 4 basomedian chaetae. 4 – 5 + 4 – 5 postlabial chaetae. Frontal chaeta ap present. Axial chaetotaxy of body 12,8 / 6,6,6,6 (Figs 15, 18, 19). Macrochaetotaxy: 3 (A), 3 (A) / 3,3 (5), 3 (5) (A: Mdl macrochaetae in anterior position). Abd. II and III with 2 additional macrochaetae on each side, these macrochaetae weakly developed on Abd. I. Corner mesochaetae on Th. II and III slightly stronger than other mesochaetae of prow. Number of s-chaetae: 3,3 / 2,2,2,2,4 (s), 1,1 / 1,1,1 (ms). S-chaetae of medium size, medial ones on Abd. I – III arranged lateral to Mdl macrochaetae. Sternite of Th. III without chaetae. Coxa I without an external chaeta. Tibiotarsi with 1,2,2 dorsal tenent hairs acuminate and ventral tenent hair hardly developed (Fig. 20). Tibiotarsi I and II with 21 chaetae each, tibiotarsus III with 25 – 26 chaetae. Empodial appendage 0.6 – 0.7 of inner edge of claw in length. Ventral tube with 4 posterior chaetae. Retinaculum with 4 + 4 teeth and 1 chaeta. Anterior furcal subcoxa with 3 – 4 chaetae, posterior one with 6 – 10 chaetae. Manubrium with 9 – 11 + 9 – 11 dorsal chaetae, including 3 + 3 on baso-lateral flaps (Fig. 16). Mucro bidentate, compact. Dens with 1 anterior and 5 posterior chaetae (Figs 16, 17), dens: claw III = 1.6 – 1.8. Manubrium: dens: mucro = 7.8 – 9.6: 4.0 – 4.7: 1. Anal spines parallel, small, on low and not sclerotised papillae. Medial mesochaetae (a 1) of Abd. V slightly in front of medial macrochaetae (a 2). Macrochaetae of Abd. VI stiff and set together forming a cluster (Figs 13, 14). Males present.	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
BE0787D3FF97E641FF49FA61FC3438EA.taxon	discussion	Remarks. The new species belongs to the asiatic ' stebaevae ' group with 3,3,3 main macrochaetae on Abd. I – III, respectively. It resembles species having numerous chaetae on furca: T. czernovae Kutyreva, 1980 (south part of the Far East of Russia) and T. antoni Potapov, 1997 (East Siberia, Russia), with 6 and 5 chaetae on posterior side of dens, respectively. The new species differs from T. czernovae by fewer chaetae on anterior side of dens (1 / 5 vs. 2 – 3 / 6) and from T. antoni by more chaetae in axial group of Abd. I – III (6,6,6 vs. 4,4,4).	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
BE0787D3FF97E641FF49FA61FC3438EA.taxon	distribution	Distribution. It is known only from Changbai Mountain massive in northeast China.	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
BE0787D3FF97E641FF49FA61FC3438EA.taxon	etymology	Derivatio nominis. The species is named after Dr. Donghui Wu, whose scientific activity made considerable input to knowledge of fauna of Collembola of Changbai Mountains.	en	Xie, Zhijing, Potapov, Mikhail, Sun, Xin (2019): Two new species of the genus Tetracanthella (Collembola; Isotomidae) from China. Zootaxa 4585 (3): 573-580, DOI: 10.11646/zootaxa.4585.3.11
