Dulichiopsis Laubitz, 1977

Ariyama, Hiroyuki, 2019, Four Species of Dulichiidae (Crustacea: Amphipoda) from Japan, with the Description of a New Genus and Two New Species, Species Diversity 24 (1), pp. 29-48 : 40

Genus Dulichiopsis Laubitz, 1977

[Japanese name: Shakutoridoronomi-modoki-zoku, new]

Dulichiopsis Laubitz, 1977: 951 ; Laubitz 1983: 80; Barnard and Karaman 1991: 659; Myers and Lowry 2003: 470.

Type species. Dulichia nordlandica Boeck,1871 , by original designation.

Emended diagnosis. Body subcylindrical, but urosomites slightly depressed dorsoventrally; pereonites 6, 7 fused; urosomites flexed beneath posterior pereonites and pleonites 1–3, urosomite 1 elongate, urosomites 2, 3 coalesced, shorter than urosomite 1. Head more or less rectangular, rostrum small; eyes dorsally fused, weakly developed or absent. Antennae very long, slender; antenna 1 peduncular article 3 longest, accessory flagellum 3- or 4-articulate; antenna 2 slightly shorter than antenna 1. Upper lip broad, fleshy, ventral margin bilobed. Mandible, molar developed; palp with 3 articles, article 2 longest, article 3 rectolinear. Lower lip with well-developed inner lobes, outer lobes each with short mandibular lobe. Maxilla 1, inner plate rudimentary, without setae; outer plate bearing 9 terminal robust setae; palp 2-articulate, with several robust setae at tip. Maxilla 2 inner plate with mediofacial row of setae. Maxilliped inner plate with 2–4 short robust setae; outer plate not reaching apex of palp article 2, with marginal robust setae; palp consisting of 4 articles, article 4 with stout seta. Coxae small, short, discontiguous; gills present on coxae 2–5; oostegites of female present on coxae 2–4. Gnathopod 1 weakly subchelate, rather simple; carpus longer than propodus, propodus weakly almond-shaped. Male gnathopod 2 powerfully developed, subchelate; carpus much shorter than propodus, propodus dilated, posterior margin usually with proximal and distal projections, palm oblique, dactylus long. Female gnathopod 2 smaller than that of male, subequal to gnathopod 1, subchelate; carpus shorter than propodus, palm oblique. Pereopods 3, 4 short, subsimilar to each other; basis slender, glandular. Pereopods 5–7 elongate, similar to each other, progressively longer; basis linear, propodus with palm, dactylus short. Pleopods large, each with developed peduncle. Uropods 1, 2 slender, biramous, uropod 1 longer than uropod 2, peduncles of both uropods shorter than both rami, outer rami shorter than inner rami; uropod 3 absent. Telson entire, ovate, longer than broad.

Included species. Dulichiopsis abyssi (Stephensen, 1944) ; D. barnardi Laubitz, 1977 ; D. brevidactyla Ledoyer, 1986 ; D. cyclops (Gurjanova, 1946) ; D. dianae Corbari and Sorbe, 2018 ; D. macera (Sars, 1879) ; D. nordlandicus (Boeck, 1871) ; D. remis ( Barnard, 1964) .

Remarks. This genus resembles Dulichia , but is readily distinguishable in the obsolescent to absent eyes and the prehensile pereopods 5–7.