Torrenticolidae Piersig 1902
Creators: name: Gu, Xin-Yao
name: Jin, Dao-Chao
name: Guo, Jian-Jun
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Trombidiformes
Torrenticolidae

description: 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 (<½ of gnathosoma dL) ........................................................................... 6
– Infracapitular rostrum long (≥½ of gnathosoma dL) .......................................................................11
6. Palp relatively thin and long ............................................................................................................. 7
– Palp robust and compact, P-2 shorter than P-4, Cx-IV with a prominent suture line of starting at right angle from genital field, laterally curved anteriorly ............................... T. nanshihensis Pešić 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 Pešić 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 Pešić & 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 Pešić et al.
19. Infracapitular rostrum short (<½ of gnathosoma dL) ......................................................................... 20
– Infracapitular rostrum long (≥½ of gnathosoma dL ................ T. suptilisrostrum Gu & Guo sp. nov.
20. About ¾ of shoulder platelet fused with the large dorsal plate, posterior suture line of Cx-I retrogressive ........................................................................................ T. postfusina Gu & Guo 2019
– About ½ 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.
description: 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