 |
Geothelphusa mutsu Geothelphusa amakusa Naruse & Ng, 2024 |
Abstract
This study designates a lectotype for and redescribes Thelphusa dehaani White, 1847, a Japanese primary freshwater crab species belonging to the potamid genus Geothelphusa Stimpson, 1858. Geothelphusa dehaani was described based on material exported to the Netherlands by von Siebold. Although the provenance of all his specimens is uncertain (they may be from several locations), our morphological comparison of the lectotype with fresh specimens led us to ascertain that it was almost certainly collected from Nagasaki, where von Siebold stayed. Two new Geothelphusa species are also described from Amakusa Islands and Aomori Prefecture.
Keywords: Taxonomy, primary freshwater crab, Potamoidea, von Siebold
 |
| Coloration of Geothelphusa amakusa n. sp. A, holotype, RUMF-ZC-8152, male, 30.3×22.5 mm; B, RUMF-ZC-8153, female, 28.8×22.7 mm; C, D, 20161020; E, 20161020; F, ZRC 2017.0975, male, 18.9×14.8 mm. |
Geothelphusa amakusa n. sp.
Etymology The species is named after the type locality, Amakusa Island. The name is used as a noun in apposition.
 |
| Coloration of Geothelphusa mutsu n. sp. A, male, ZRC 2018.0716, 19.3×15.1 mm; B, female, ZRC 2018.0716, 24.1× 18.4 mm; C, D, male, ZRC 2018.0716, 20.4 × 15.3 mm. |
Geothelphusa mutsu n. sp.
Etymology The species is named after “Mutsunokuni”, a previous estate name of the type locality (Aomori Prefecture) and also a historical province name for a larger area of northern Honshu Island. The name is used as a noun in apposition.
Tohru Naruse and Peter K. L. Ng. 2024. The Identity of the Japanese Freshwater Crab, Geothelphusa dehaani (White, 1847) (Decapoda: Brachyura: Potamidae), with Descriptions of Two New Species from Japan. Crustacean Research. 53; 53-71. DOI: doi.org/10.18353/crustacea.53.0_53