Grandidierella Coutière, 1904

Ariyama, Hiroyuki & Kawabe, Katsutoshi, 2022, Two New Species of Aoridae from Chichijima Island, the Ogasawara Islands in Japan (Crustacea: Amphipoda), Species Diversity 27 (1), pp. 113-128 : 120-121

Genus Grandidierella Coutière, 1904

[Japanese name: Dorosokoebi-zoku]

Grandidierella Coutière, 1904: 166 ; Barnard and Karaman 1991: 194; Myers and Lowry 2003: 465; Ariyama 2020: 3 .

Neomicrodeutopus Schellenberg, 1925: 168 .

Grandidierella (Bigrandidierella) Karaman, 1985: 37 .

Propejanice Myers and Desiderato, 2019: 288 .

Type species. Grandidierella mahafalensis Coutière, 1904 , fixed by monotypy.

Diagnostic description [emended from Ariyama (2020)]. Body subcylindrical, slightly depressed laterally,

smooth; urosomites free. Head, rostrum short, ocular lobes short; eyes small to large. Antenna 1 elongate, slender, peduncular article 3 much shorter than article 1, accessory flagellum 1–2 articulate; antenna 2 stouter than antenna 1, flagellum shorter than peduncular article 5. Mandible, palp with 3 articles, article 3 clavate or rectolinear. Maxilla 1 with vestigial inner plate; outer plate with ca. 10 robust setae; palp biarticulate, with several robust setae at tip. Maxilla 2, inner plate usually with mediofacial row of setae. Maxilliped, inner plate with several robust setae distally; outer plate not reaching apex of palp article 2, with many marginal robust setae; palp consisting of 4 articles, article 4 with short robust seta (nail). Coxae small, relatively shallow, slightly or not overlapping; gills present on coxae 2–6; oostegites of female broad, present on coxae 2–5. Male gnathopod 1 greatly enlarged, carpochelate; carpus dilated, propodus short. Female gnathopod 1 smaller than that of male, subchelate, palm oblique. Gnathopod 2 of both sexes smaller than gnathopod 1, subchelate; propodus shorter than or almost same length as carpus, palm transverse. Pereopods 3, 4 similar to each other, slender; bases elongate. Pereopods 5–7 similar to each other, pereopod 5 much shorter than pereopods 6, 7; basis of pereopod 7 setose posteriorly. Uropods 1, 2 biramous, uropod 1 longer than uropod 2, peduncles usually longer than both rami; uropod 3 uniramous, peduncle usually shorter than single ramus, dilated medially. Telson entire, short, fleshy, with pair of hooked apical cusps.

Remarks. Main points of the emendation are as follows: eyes “small to large” from “small to medium” because of the large eyes in Grandidierella ogasawarensis sp. nov., and peduncles of uropods 1, 2 “usually longer than both rami” from “longer than both rami” because of the inner ramus of uropod 2 almost same length as peduncle in G. ogasawarensis .