Solitroides, Suzuki & Nakano & Nguyen & Nguyen & Morino & Tomikawa, 2017

Suzuki, Yuya, Nakano, Takafumi, Nguyen, Son Truong, Nguyen, Anh Thi Thu, Morino, Hiroshi & Tomikawa, Ko, 2017, A new landhopper genus and species (Crustacea: Amphipoda: Talitridae) from Annamite Range, Vietnam, Raffles Bulletin of Zoology 65, pp. 304-315 : 305-306

Genus Solitroides , new genus

Type species. Solitroides motokawai , new species, by present designation.

Diagnosis (female). Body size medium. Eyes medium. Antenna 1 reaching distal part of peduncular article 4 of antenna 2: peduncle longer than flagellum, articles 1 and 2 subequal in length, article 3 longest. Antenna 2 with flagellum subequal to peduncle in length. Maxilla 1, innermost apical robust seta on outer plate leaning inwards. Mandible, left lacinia mobilis four-dentate, right lacinia mobilis bifid, bearing two and three teeth. Maxilliped outer plate arcuate, apically rounded with submarginal setae; palp slender, medial lobes of articles 2 and 3 undeveloped, article 4 coalescing with article 3.

Gnathopod 1 unguiform; basis to propodus without lobe, palmar margin oblique, with robust setae, dactylus approximately twice as long as palmar margin. Gnathopod 2; basis slender, ischium and merus without lobe, carpus with lobe, propodus mitten-shaped, posterior lobe developed, palmar margin parallel to anterior margin. Pereopods 3–7 simplidactylate, locking robust setae on propodi lacking, dactyli elongate and slender, nail subequal to base. Coxa of pereopod 4 wider than deep. Coxa of pereopod 6, anterodistal corner of posterior lobe quadrate with setae. Coxal gills of gnathopod 2 and pereopod 6 largest, gill of gnathopod 2 lobed at middle, gill of pereopod 6 complex, folded, partly lobate; gills of pereopods 3–5 without lobe, distally attenuated. Oostegites small, each with 3–5 short and simple apical setae.

Epimeral plates without slits above ventral margins, posterodistal corners of plates 1 and 2 quadrate, that of plate 3 rounded. Pleopods 1–3 biramous, rami developed; peduncles of pleopods 1 and 2 without seta, inner and outer margins of peduncle of pleopod 3 with numerous minute simple setae. Uropod 1, peduncle with distolateral robust seta longer than subdistal seta; inner ramus with three robust setae marginally; outer ramus with bare margin. Uropod 2, inner ramus slightly longer than outer ramus, with three robust setae marginally; outer ramus with bare margin. Uropod 3, peduncle with dorsal robust seta and a few small setae, ramus shorter than peduncle, with two apical setae. Telson rhombic, apical part slightly cleft, with one apical seta per lobe.

Etymology. The generic name is a compound noun derived from the Latin word, solus (alone), and the family specific suffix -tr-oides (masculine), referring to the fact that the type species’ known locality is isolated from the distributions of the other simplidactylate landhoppers.