Torrenticolidae Piersig 1902

Key to the known species of the family Torrenticolidae in China. (Updated Gu & Guo 2019 and Gu et al. 2019) 3. Infracapitulum dorsal apodeme short, P-2 and P-3 with obvious ventral protrusions or hyaline expansions (Genus Torrenticola)...................................................................................................... 4 ��� Infracapitulum dorsal apodeme long, P-2 and P-3 without projections on ventral side (Genus Monatractides)................................................................................................................................ 21 4. Dorsal plate arrangements: 4+1........................................................................................................ 5 ��� Dorsal plate arrangements: 2+1, 2+2p+1....................................................................................... 18 5. Infracapitular rostrum short ( T. nanshihensis Pe��ić et al. 7. P-3 with a very long tapering ventral projection.............................................................................. 8 ��� P-3 with a triangular, relatively short ventral projection.................................................................. 9 8. P-2 and P-3 with the smooth and sharp ventral extension.......................... T. projectura Pe��ić et al. ��� P-2 and P-3 with the serrated ventral extension.......................................... T. dentifera Wiles, 1991 9. Infracapitular bay deep, ventral apodeme L about two times of dorsal apodeme.......................... 10 ��� Infracapitular bay shallow, ventral apodeme L three times longer than dorsal apodeme.................................................................................................................................................... T. curta Jin, 1997 10. Idiosoma roundish, the lateral view of infracapitulum acute triangle-like....................................................................................................................................................... T. siamis Pe��ić & Smit, 2009 ��� Idiosoma elliptical, infracapitulum regular triangle-like in the lateral view....................................................................................................................................................... T. trigona Gu & Guo, 2019 11. Ventral extensions of P-2, P-3 serrate............................................................................................. 12 ��� Ventral extensions of P-2, P-3 smooth............................................................................................ 13 12. Dorsal apodeme of infracapitulum with a fine spine, AP close to the line of primary sclerotization, E 4 at the same level as the 3 rd pair of acetabula....... T. yanjinensis Jin, 1997 ��� Dorsal apodeme of infracapitulum with a broad spine, AP on the line of primary sclerotization, E 4 at the same level as the 4 th pair of acetabula...................................................... T. dentipalpis Jin, 1997 13. The concavity between the ventral prolongations of P-4 small, idiosoma elliptical...................... 14 ��� The concavity between the ventral prolongations of P-4 big and obvious, idiosoma oblate........................................................................................................................ T. fodingensis Gu & Guo, 2018 14. Ap anterior to V 2 .............................................................................................................................. 15 ��� Ap on the line with V 2 or posterior to V 2 ......................................................................................... 16 15. P-2 longer than ⅓ total palp L, gnathosoma elongated, vL 308���381, dL 263���30..................................................................................................................................... T. tenuichelicera Gu & Guo, 2018 ��� P-2 shorter than ⅓ total palp L, gnathosoma normal, vL 284���302, dL 229���231................................................................................................................................................ T. nipponica (Enami, 1940) 16. Ap on the line with V 2 , shoulder platelets normal........................................................................... 17 ��� Ap posterior to V 2 , shoulder platelets offset to the inside............... T. hainanensis Gu & Guo, 2019 17. P-2 with a laterally compressed and apically serrated ventrodistal extension, spine-like...................................................................................................................... T. spinextension Gu & Guo sp. nov. ��� P-2 with a small sharp ventrodistal extension................................................. T. tetrapora Viets, 1935 18. Dorsal plate arrangements: 2+2p+1................................................................................................ 19 ��� Dorsal plate arrangements: 2+1, P-3 distal margin with denticles, P-4 stocky.......................................................................................................... T. taiwanicus Pe��ić et al. 19. Infracapitular rostrum short (T. suptilisrostrum Gu & Guo sp. nov. 20. About �� of shoulder platelet fused with the large dorsal plate, posterior suture line of Cx-I retrogressive........................................................................................ T. postfusina Gu & Guo 2019 ��� About �� of shoulder platelet fused with the large dorsal plate, posterior suture line of Cx-IV obvious and long........................................................................................... T. wuyiensis Gu & Guo sp. nov. Remark Torrenticola semicolor Viets, 1977 and Torrenticola alargada Goldschmidt, 2007, reported to be new records to Chinese fauna, were rechecked to be mis-determinated. So they are not included in the key.
Published as part of Gu, Xin-Yao, Jin, Dao-Chao & Guo, Jian-Jun, 2020, Three new species and one new record of Torrenticolidae (Acari, Hydrachnidia) from Wuyishan with an updated key for Chinese fauna, pp. 1-23 in European Journal of Taxonomy 625 on pages 20-22, DOI: 10.5852/ejt.2020.625, http://zenodo.org/record/3750775
{"references":["Gu X. Y. & Guo J. J. 2019. Five new species of genera Torrenticola and Monatractides (Acari, Hydrachnidia, Torrenticolidae) from Hainan Island, China. Systematic and Applied Acarology 24 (12): 2460 - 2482. https: // doi. org / 10.11158 / saa. 24.12.12","Wiles P. R. 1991. Rheophilic watermites (Acari: Hydrachnidia) from mainland Malaysia. Acarologia 32 (1): 41 - 56.","Jin D. C. 1997. Hydrachnellae-morphology systematics a primary study of Chinese fauna. Guizhou Science and Technology Publishing House, Guiyang.","Enami M. 1940. Water mites from Izu. I. Rheophilous water mites from river Inozawa. To hoku Daigaku. Science reports of Tohoku University (Series 4, Biology) 15: 225 - 229.","Goldschmidt T. 2007. Studies on Latin American water mites of the genus Torrenticola Piersig, 1896 (Torrenticolidae, Hydrachnidia, Acari). Zoological Journal of the Linnean Society 150: 443 - 678. https: // doi. org / 10.1111 / j. 1096 - 3642.2007.00305. x"]}