taxonID	type	description	language	source
C94E87016145E70FFE151246FC83FBD5.taxon	description	Figs. 1 A-C, E-G Synonym — Hydrodroma kakadu Pešić & Smit 2007 a: 38 [in part].	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016145E70FFE151246FC83FBD5.taxon	materials_examined	Material examined — Holotype ♂ (MNHN), New Caledonia, Creek des Japonais at crossing with road Thio-Boulouparis, 27 Sept. 2000, leg. Smit, dissected and slide mounted. Paratypes: 2 ♂, 3 ♀, same place and data as holotype, 1 ♀ dissected and slide mounted (MNHN, RMNH) ; 8 ♀, 1 deutonymph, New Caledonia, Hienghène Rivière, 19 km from mouth, 29 Sept. 2000, leg. Smit (RMNH). Other material — New Caledonia: Rivière Amoa tributary RG, 20 ° 58 ′ 47.857 S, 165 ° 09 ′ 32.126 E, 25 Oct. 2005 leg. Flouhr, 1 ♂, 1 ♀ ; Rivière Nodéla, 20 ° 26 ′ 42.600 S, 165 ° 19 ′ 52.345 E, 13 May 2005 leg. Flouhr, 1 ♀ ; Rivière Nodéla, 20 ° 26 ′ 42.600 S, 165 ° 19 ′ 52.345 E, 13 May 2005 leg. Flouhr, 1 ♀ ; Dothio Rivière at crossing with road Thio- Nakéty, 28. ix. 2000, leg. Smit, 4 ♀ ; Oua Mendiou Rivière 30 km from mouth, 01 Oct. 2000, leg. Smit, 3 ♀ ; Thio Rivière at crossing with road to Kouaré, 27. Sept. 2000 leg. Smit, 1 ♂ ; Rivière Coulée, 22 ° 10 ′ 24.327 ″ S, 166 ° 37 ′ 18.119 ″ E, 21 Oct. 2005 leg. Smit, 1 ♂, 2 ♀ ; Rivière Coulée, 22 ° 60 ′ 25.876 ″ S, 166 ° 37 ′ 22.857 ″ E, 20 Sept. 2001 leg. Mary, 1 ♀ [damaged ; gnathosoma and palps lacking] ; Rivière Thio, 21 ° 38 ′ 13.4736 ″ S, 166 ° 11 ′ 56.935 ″ E, 29 Oct. 1997 leg. Mary, 1 ♀, dissected and slide mounted (RMNH) ; Thio 7, 02. viii. 2000 leg. Mary, 2 ♀ ; Néaoua, 27 Oct. 1999, leg. Mary, 1 ♀ ; Thiiem, 02 Nov. 1999 leg. Mary, 5 ♀ ; Boghen 1, 30 Oct. 1999, leg. Mary, 1 ♀ ; Thio 7 (Dothio I), 12 Jan. 2000 leg. Mary, 2 ♀.	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016145E70FFE151246FC83FBD5.taxon	diagnosis	Diagnosis — Idiosoma and gnathosoma large in size (idiosoma L ˃ 1000, genital plates L ˃ 200, P- 4 ˃ 190 µm) ; integument papillae rounded. Genital plates with 47 – 51 pairs of Ac in at most 4 longitudinal rows. Leg setae numbers: II-L-posterior 3 - 4 ; III-L- 4 posterior 9 - 14 ; III-L- 5 posterior 7 - 11 ; IV-L- 4 anterior 8 - 12, posterior 9 - 14 ; IV-L- 5 anterior 0, posterior 6 - 8.	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016145E70FFE151246FC83FBD5.taxon	description	Description — Integument with reticulation in deeper layers (Fig. 4 B). Cx-I + II medially separated by a fine membranous line, with a row of long fine setae at medial margins of Cx-I, and posterior margins of Cx-II, - III, and - IV. Genital flaps with rounded lateral and concave medial margins. Excretory pore sclerotized. Leg claws without claw blade, with a dorsal clawlet. Male (holotype): Idiosoma L 1300, W 1050. Coxal field L 588 ; Cx-III W 659, L Cx-I + II 253, Cx-III + IV 322 ; coxal setae numbers: Cx-I, 17 ; Cx-II, 19 ; Cx-III, 13 ; Cx-IV 18. Genital plate L 208, on each plate Ac number 49, with 23 - 26 setae, all hollow. Ejaculatory complex L 194. Gnathosoma vL 244 ; chelicera total L 277, L basal segment 211, claw 63, L ratio basal segment / claw 3.3. Palp (Fig. 1 E) total L 452, dL / H, dL / H ratio: P- 1, 56 / 37, 1.53 ; P- 2, 77 / 56, 1.38 ; P- 3, 50 / 58, 0.87 ; P- 4, 191 / 45, 4.3 ; P- 5, 78 / 19, 4.2 ; L ratio P- 2 / P- 4, 0.4. dL IV-L: 94, 169, 191, 297, 313, 275. Female (paratype from Creek des Japonais, n = 1 ; in parentheses some measurements of the specimen from Rivière Thio, n = 1): Idiosoma L 1420 (1350), W 1160. Coxal field L 623 (622) ; Cx-III W 669 (644) ; L Cx-I + II 291 (283), Cx-III + IV 363 (338) ; coxal setae numbers: Cx-I, 19 (16) ; Cx-II, 28 (19) ; Cx-III, 20 (15) ; Cx-IV 16 (17). Genital plate large, L 228 (219), on each plate Ac number 51 (47), with 26 (22) setae. Gnathosoma vL 255 (259) ; chelicera total L 309 (305), L basal segment 242 (231), claw 66 (67), L ratio basal segment / claw 3.7 (3.5). Palp (Fig. 1 F) total L 463 (464), dL / H, dL / H ratio: P- 1, 56 / 39, 1.44 (60 / 42, 1.4) ; P- 2, 77 / 62, 1.25 (83 / 63, 1.32) ; P- 3, 52 / 59, 0.87 (48 / 55, 0.88) ; P- 4, 198 / 47, 4.2 (195 / 45, 4.3) ; P- 5, 80 / 19, 4.1 (78 / 20, 3.9) ; L ratio P- 2 / P- 4, 0.39 (0.42). dL IV-L: 111 (113), 184 (172), 209 (198), 325 (316), 338 (347), 292 (291).	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016145E70FFE151246FC83FBD5.taxon	etymology	Etymology — Named after the island where the new species was collected.	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016145E70FFE151246FC83FBD5.taxon	discussion	Discussion — The new species from New Caledonia closely resembles Hydrodroma kakadu Pešić & Smit, 2007, a species similar in the presence of 3 - 4 swimming setae on II-L- 5 and in the absence of swimming setae from anterior IV-L- 5. It was originally described from Kakadu National Park, Australia, and reported also from New Caledonia (Pešić & Smit 2007 a). The latter authors mentioned that specimens of H. kakadu from Australia differ from specimens from New Caledonia, in this study assigned to the new species H. novacaledonica sp. nov., in smaller dimensions of the idiosoma and gnathosoma (e. g., idiosoma L: ˂ 800 in ♂, ˂ 1000 in ♀ ; L genital plates ˂ 180 in ♂, ˂ 190 µm in ♀ ; in both sexes L gnathosoma ˂ 190, chelicera ˂ 250, P- 4 ˂ 150 µm) and in a reduced number of swimming setae on III / IV-L (less than 10 on both posterior III-L- 4 and anterior IV-L- 4) (Pešić & Smit 2007 a). These differences are confirmed by the examination of new material from New Caledonia. Moreover, the new species from New Caledonia differs in the shape of integument papillae (rounded vs. pointed in specimens of H. kakadu from Australia ; compare Fig. 1 C and Fig. 1 D).	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016145E70FFE151246FC83FBD5.taxon	distribution	Distribution — New Caledonia.	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016142E702FE1515F8FC83F929.taxon	description	Figs. 2, 3 A-C, E-G	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016142E702FE1515F8FC83F929.taxon	materials_examined	Material examined — Holotype ♂ (MNHN), New Caledonia, Rivière Ouénaoué at crossing with Mt Koghi road, 22 ° 10.856 S, 166 ° 29.532 E, 13 Nov. 2005 leg. Smit, dissected and slide mounted. Paratypes: 1 ♀, same place and data as the holotype, leg. Smit, dissected and slide mounted, (MNHN) ; 2 ♀, 1 deutonymph, La Coulée Rivière downstream of barrage, 22 ° 10.404 S, 166 ° 37.291 E, 16 Nov. 2005 leg. Smit, 1 ♀ dissected and slide mounted (RMNH). Other material — New Caledonia: Rivière Voh, 20 ° 56 ′ 13.241 ″ S, 164 ° 43 ′ 29.427 ″ E, 6 Nov. 2001 leg. Mary, 1 ♂ ; Unnamed Creek E of Pont Pérignon, Parc de la Rivière Bleue, 24 Sept. 2000 Smit, 1 ♀ (partly damaged) ; Coco amont, 5 Oct. 2000 leg. Mary ; Rivière Confiance, leg. Mary, 1 ♂.	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016142E702FE1515F8FC83F929.taxon	diagnosis	Diagnosis — Integument papillae rounded. Genital plates with 38 – 43 pairs of Ac in at most 3 longitudinal rows. Leg setae numbers: II-L-posterior 1 (short) ; III-L- 4 posterior 4 - 6 ; III-L- 5 posterior 3 - 6 ; IV-L- 4 anterior 4, posterior 7 ; IV-L- 5 anterior 0, posterior 3 - 4.	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016142E702FE1515F8FC83F929.taxon	description	Description — General features — Integument with reticulation in deeper layers. Cx-I + II medially separated by a fine membranous line, with a row of long fine setae at medial margins of Cx-I, and posterior margins of Cx-II, - III, and - IV. Genital flaps with rounded lateral and strongly concave medial margins. Excretory pore sclerotized. Legs claws without claw blade, with a dorsal clawlet. Males (holotype): Idiosoma L 910. Coxal field L 464 ; Cx-III W 456 ; L Cx-I + II 219, Cx-III + IV 256 ; coxal setae numbers: Cx-I, 22 ; Cx-II, 25 ; Cx-III, 19 ; Cx-IV 16. Genital plate slender, L 197, on each plate Ac number 38, with 23 setae, all hollow. Ejaculatory complex L 156. Gnathosoma vL 194 ; chelicera total L 266, L basal segment 205, claw 63, L ratio basal segment / claw 3.3. Palp (Figs. 3 C-D) total L 376, dL / H, dL / H ratio: P- 1, 44 / 34, 1.27 ; P- 2, 66 / 55, 1.2 ; P- 3, 41 / 47, 0.87 ; P- 4, 158 / 39, 4.0 ; P- 5, 67 / 17, 3.9 ; L ratio P- 2 / P- 4, 0.42. dL IV-L: 84, 141, 166, 250, 266, 244. Female (paratype from Rivière Ouénaoué, n = 1 ; in parentheses specimen from La Coulée Rivière, n = 1): Idiosoma L 1050, W 1000. Coxal field L 484 (450) ; Cx-III W (516) ; L Cx-I + II 209 (216), Cx-III + IV 247 (256) ; coxal setae numbers: Cx-I, 19 (20) ; Cx-II, 23 (26) ; Cx-III, 24 (20) ; Cx-IV, 17 (15). Genital plate L 181 (183), on each plate Ac number 43 (44), with 21 (31) setae. Egg maximum diameter (n = 2) 116 - 122. Gnathosoma vL 197 ; chelicera total L 266 (256), L basal segment 198 (203), claw 65 (61), L ratio basal segment / claw 3.1 (3.3). Palp (Fig. 3 F) total L 375 (382), dL / H, dL / H ratio: P- 1, 47 / 35, 1.35 (47 / 32, 1.47) ; P- 2, 63 / 56, 1.12 (66 / 48, 1.37) ; P- 3, 38 / 50, 0.75 (39 / 47, 0.83) ; P- 4, 158 / 39, 4.0 (163 / 38, 4.27) ; P- 5, 69 / 17, 4.1 (67 / 15, 4.5) ; L ratio P- 2 / P- 4, 0.40 (0.41). dL IV-L: 86 (100), 147 (150), 166 (172), 256 (263), 275 (272), 238 (241).	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016142E702FE1515F8FC83F929.taxon	etymology	Etymology — Named after the Pacific region.	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016142E702FE1515F8FC83F929.taxon	discussion	Discussion — The new species resembles Hydrodroma cooki Pešić & Smit, 2007, a species widely distributed in lentic waters in Australia (Pešić & Smit, 2007 b). It shares the presence of only one short swimming setae on II-L- 5 and the absence of swimming setae from anterior IV-L- 5. From the new species, H. cooki is distinguished by an increased number of genital acetabula (on each plate 63 – 161 Ac in 5 – 9 longitudinal rows) and swimming setae on III / IV-L (more than 10 on both posterior III-L- 4 and anterior IV-L- 4), legs with a relatively small-sized claw and by the shape of the integument papillae (pointed vs. rounded in H. pacifica sp. nov.). Hydrodroma wilesi Pešić & Smit, 2007, reported from a helocrene spring and stream in the Northern Territory, Australia (Pešić & Smit, 2007 b), is similar in legs with a relatively large-sized claw and genital plate with <60 Ac in 4 – 5 rows. It differs from the new species in a reduced number of swimming setae on III / IV-L (III-L- 4 posterior 1 – 2, III-L- 5 posterior 1 – 3 rather short, IV-L- 4 anterior 2 – 3, posterior 2 – 4, IV-L- 5 posterior 1).	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
C94E87016142E702FE1515F8FC83F929.taxon	distribution	Distribution — New Caledonia.	en	Pešić, Vladimir, Smit, Harry, Mary, Nathalie J. (2021): Two new water mite species of the genus Hydrodroma Koch, 1837 from New Caledonia (Acari, Hydrachnidia: Hydrodromidae). Acarologia 61 (3): 581-590, DOI: 10.24349/aGHX-uIU1, URL: http://www1.montpellier.inrae.fr/CBGP/acarologia/article.php?id=4456
