Najnidae J.L. Barnard, 1972

Myers, A, 2013, A Phylogeny and Classification of the Senticaudata subord. nov. (Crustacea: Amphipoda), Zootaxa 3610 (1), pp. 1-80 : 30-31

Najnidae J.L. Barnard, 1972 b

Type genus. Najna Derzhavin, 1937 .

Diagnostic description. Body laterally compressed. Eyes well developed, round or ovoid. Antennae 1–2 calceoli absent. Antenna 1 subequal in length to antenna 2; peduncular article 1 slightly longer than article 2; article 2 subequal to, or slightly longer than article 3; article 3 shorter than article 1; peduncular articles 1–2 not geniculate; accessory flagellum absent. Antenna 2 peduncular article 1 not enlarged. Mandible molar reduced or absent; palp absent. Maxilla 1 basal endite apically setose; palp present, symmetrical. Maxilla 2 basal endite without oblique setal row. Coxal gills on pereopods 2–6, not stalked; sternal gills absent; sternal blisters absent; oostegites fringing setae curl-tipped. Gnathopod 1 subchelate; similar in size to gnathopod 2; propodus palm without robust setae along palmar margin. Gnathopod 2 subchelate; similar in males and females (not sexually dimorphic); carpus slightly produced along posterior margin of propodus. Pereopods 3–4 not sexually dimorphic. Pereopod 4 with small posteroventral lobe. Pereopod 5 shorter than pereopod 6; coxa with posteroventral lobe. Pereopod 7 longer than pereopod 5. Pleonites 1–3 without dorsal carinae. Urosomites 1–3 free; without slender or robust dorsal setae. Urosomite 1 without large distoventral robust seta. Urosomite 2 without dorsal setae. Uropod 1 without basofacial robust setae. Uropod 3 uniramous, without plumose setae. Telson entire ; dorsal or lateral robust setae absent; apical robust setae present or absent.

Habitat. Marine, algal dwellers, epigean.

Included genera.? Insula Kunkel, 1910 ; Najna Derzhavin, 1937 .

Remarks. Serejo (2004) considered this taxon as a subfamily. We re-establish it to family-level status. Najnids separate from other talitroid taxa in not having a mandibular molar and in having non-sexually dimorphic second gnathopods.

Distribution. North Pacific.