Grandidierella Coutière, 1904

Ariyama, Hiroyuki, 2020, Six species of Grandidierella collected from the Ryukyu Archipelago in Japan with descriptions of four new species (Crustacea: Amphipoda: Aoridae), Zootaxa 4810 (1), pp. 1-44 : 3

Grandidierella Coutière, 1904

[Japanese name: Dorosokoebi-zoku]

Grandidierella Coutière, 1904: 166 .—J.L. Barnard & Karaman, 1991: 194.— Myers & Lowry, 2003: 465.

Neomicrodeutopus Schellenberg, 1925: 168 .

( Bigrandidierella ) Karaman, 1985: 37.

Propejanice Myers & Desiderato, 2019: 288 .

Type species. Grandidierella mahafalensis Coutière, 1904 , monotypy.

Diagnosis [emended from Ariyama & Taru (2017)]. Body subcylindrical, slightly depressed laterally, smooth. Head, rostrum short, ocular lobes short; eyes small to medium. Urosomites free. 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, dactylus stout. Female gnathopod 1 smaller than that of male, subchelate, palm oblique. Gnathopod 2 of both sexes smaller than gnathopod 1, subchelate; carpus longer than or almost same length as propodus, palm transverse. Pereopods 3 and 4 similar to each other, slender; bases elongate. Pereopods 5–7 similar to each other, pereopod 5 much shorter than pereopods 6 and 7; basis of pereopod 7 heavily setose posteriorly. Uropods 1 and 2 biramous, spinous, uropod 1 longer than uropod 2, peduncles 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. Recently, Myers & Desiderato (2019) established a new genus, Propejanice Myers & Desiderato, 2019 , having a carpochelate male gnathopod 1 and a setose male gnathopod 2 with a divergent merus. Although they stated Propejanice is close to the genus Janice Griffiths, 1973 , this genus should be synonymized with the genus Grandidierella , because three Grandidierella species ( G. exilis Myers, 1981 ; G. gilesi Chilton, 1921 ; and G. melakaensis Azman & Othman, 2012 ) have such a gnathopod 2. Following this synonymization, Propejanice lagamarensis Myers & Desiderato, 2019 is changed to Grandidierella lagamarensis ( Myers & Desiderato, 2019) comb. nov.