Trichodactylini Pretzmann, 1978 b

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

Tribe Trichodactylini Pretzmann, 1978 b

Trichodactylini Pretzmann, 1978 b: 169 . — Pretzmann, 1983 b: 318.

Type genus.

Trichodactylus Latreille, 1828 , designated by Pretzmann (1978 b).

Diagnosis.

Carapace: lateral margin devoid of teeth or with vestigial, reduced or developed teeth (usually up to 3 on anterolateral margin; posterolateral margin rarely with 1–2 vestigial teeth); lower orbital margin: inner corner with blunt projection sometimes absent. Efferent branchial channel: aperture with yugal lateral lobe absent. Third maxilliped, meri: distal external spine triangular, acute. Axial skeleton, interosternites: ie 4 / ie 5, ie 5 / ie 6, ie 6 / ie 7 extended mesially, reaching sternum midline as conspicuously elevated phragma; ie 7 / ie 8 interrupted mesially, not extended to sternum midline (see Magalhães and Türkay, 1996 a: fig. 7; Pedraza et al., 2015: figs. 3 A, 5 A); ie 7 / ie 8 separated from junction plate mesially (see Pedraza et al., 2015: figs. 4 A, 6 A). Pleon: pleonal somites free. Telson (male): subtriangular; anterior margin as broad as posterior margin of pleonal somite VI. G 1: simple, straight; positioned longitudinally in sternopleonal cavity; distal half subcylindrical, with lateral and mesial surfaces straight or slightly convex; distal opening wide, V-shaped, directed ventrally, apex usually regularly convex or slightly angled. G 2: longer than G 1. Large-sized species (up to 50 mm CW).