Trichodactylus Latreille, 1828

Souza-Carvalho, Edvanda A., Magalhães, Célio, Carvalho, Fabrício L. & Mantelatto, Fernando L., 2025, Systematics of Neotropical freshwater crabs Trichodactylinae based on multi-genes and morphological data: new tribe and new combinations, Arthropod Systematics & Phylogeny 83, pp. 315-329 : 315-329

Genus Trichodactylus Latreille, 1828

Trichodactylus Latreille, 1828: 705. — Latreille 1829: 43. — Latreille 1831: 343. — H. Milne Edwards 1837: 10 (in key), 16. — H. Milne Edwards 1839 [1836–1844]: 60. — Eydoux and Souleyet 1842: 237. — White 1847 a: 31. — Nicolet 1849: 151. — Dana 1851: 130. — Dana 1852 a: 293, 294. — Dana 1852 b: 124. — H. Milne Edwards 1853: 214. — Lucas 1857: 8. — Heller 1865: 35. — Martens 1868: 18 (in list). — A. Milne-Edwards 1869: 170. — Wood-Mason 1871: 191 (in list). — Ortmann 1893: 491. — Ortmann 1897: 325 [part]. — Young 1900: 227 [part]. — Moreira 1901: 45 [part]. — Ortmann 1902: 310 [part]. — Calman 1909: 315. — Colosi 1919: 42. — Colosi 1920: 10, 11 (in key) [part]. — Coifmann 1939: 111 [part]. — Garth 1957: 39. — Pretzmann 1968: 70 [part]. — Rodríguez 1992: 42 [part]. — Morrone and Lopretto 1996: 71 [part]. — Magalhães and Türkay 1996 a: 67 (in list), 71 (in key), 73 [part]. — Sternberg 1997: 56 (in tab.), 57, 58 (in fig.) [part]. — Magalhães 1998: 520 [part]. — Magalhães 2003: 199 (in key), 246 [part.]. — Ng et al. 2008: 188 (in list) [part]. — De Grave et al. 2009: 42 (in list) [part]. — Brito-Fonseca et al. 2018: 908. — Sternberg and Cumberlidge 2001: 28 (in tab.), 32 (in fig.). — Rogers et al. 2020: 942 (in key) [part]. — Jacobucci et al. 2023: 413.

Cancer ( Trichodactylus ) — Herklots 1861 a: 13. — Herklots, 1861 b: 126.

Trichodactylus (Trichodactylus) — Rathbun 1906 a: 34 [part]. — Rathbun 1906 b: 503. — Bott 1969: 14 [part].

Trichodactylus (Valdivia) — Rathbun 1906 a: 43 [part]. — Coifmann 1939: 111 [part].

Type species.

Trichodactylus fluviatilis Latreille, 1828 , by monotypy.

Diagnosis.

Same as for the tribe.

Distribution.

Atlantic drainage in coastal river basins of the northeastern, southeastern and southern Brazil, from the state of Sergipe to northeastern part of the state of Rio Grande do Sul, as well as in the Upper Paraná River basin in the states of São Paulo and Paraná.

Composition.

Trichodactylus fluviatilis Latreille, 1828 ; Trichodactylus dentatus H. Milne Edwards, 1853 ; Trichodactylus crassus A. Milne-Edwards, 1869 ; Trichodactylus petropolitanus Göldi, 1886 . See below under the section Genus inquiredum et incertae sedis for remarks on the status of “ Trichodactylus ” quinquedentatus Rathbun, 1893 .

Remarks.

In addition to these four species currently recognized as valid in the genus Trichodactylus, Souza-Carvalho et al. (2017) found that T. fluviatilis could be considered a complex of species with at least four distinct lineages. The taxonomic study of this complex is currently ongoing.