Allocrangonyctidae Holsinger, 1989

Myers, A, 2013, A Phylogeny and Classification of the Senticaudata subord. nov. (Crustacea: Amphipoda), Zootaxa 3610 (1), pp. 1-80 : 44

Allocrangonyctidae Holsinger, 1989

Type genus. Allocrangonyx Schellenberg, 1936 .

Diagnostic description. Body subcylindrical. Eyes absent. Antennae 1–2 calceoli absent. Antenna 1 longer than antenna 2; peduncular article 1 subequal to article 2; article 2 longer than article 3; article 3 shorter than article 1; peduncular articles 1–2 not geniculate; accessory flagellum minute. Antenna 2 peduncular article 1 not enlarged. Mandible molar triturating; palp symmetrical. Maxilla 1 basal endite apically setose; palps symmetrical. Maxilla 2 basal endite without oblique setal row. Labium inner lobes present. Coxal gills on pereopods 2–6, not stalked; sternal gills absent; sternal blisters present or absent; oostegites fringing setae simple. Gnathopod 1 subchelate; smaller (or weaker) than gnathopod 2; propodus palm with row or rows of simple or bifid robust setae along palmar margin. Gnathopod 2 subchelate; similar in males and females (not sexually dimorphic); carpus not produced along posterior margin of propodus, projecting between merus and propodus. Pereopods 3–4 not sexually dimorphic. Pereopod 4 without posteroventral lobe. Pereopod 5 shorter than pereopod 6; coxa with large anteroventral 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 with large distoventral robust seta. Urosomite 2 without dorsal setae. Uropod 1 with 1 or 2 basofacial robust setae. Uropod 3 sexually dimorphic; biramous, without plumose setae; endopod minute. Telson notched ; dorsal or lateral robust setae absent; apical robust setae present.

Habitat. Freshwater, hypogean.

Included genera. Allocrangonyx Schellenberg, 1936 .

Distribution. USA.