Hornelliidae

Myers, A, 2013, A Phylogeny and Classification of the Senticaudata subord. nov. (Crustacea: Amphipoda), Zootaxa 3610 (1), pp. 1-80 : 40

Hornelliidae d'Udekem d'Acoz, 2010

Type genus. Hornellia Walker, 1904 .

Diagnostic description. Body laterally compressed or subcylindrical. Eyes well developed, round, reniform or subrectangular. Antennae 1–2 calceoli absent. Antenna 1 shorter than, subequal in length to, or longer than antenna 2; peduncular article 1 shorter than or subequal to article 2; article 2 longer than article 3; article 3 shorter than article 1; peduncular articles 1–2 not geniculate; accessory flagellum short. Antenna 2 peduncular article 1 not enlarged. Mandible molar triturative; palp symmetrical. Maxilla 1 basal endite setose along medial margin; palps symmetrical. Maxilla 2 basal endite with oblique setal row. Coxal gills on pereopods 2–6, not stalked; sternal gills absent; sternal blisters absent; oostegites fringing setae simple. Gnathopod 1 subchelate; subchelate; similar in males and females (not sexually dimorphic); smaller (or weaker) than gnathopod 2; propodus palm without robust setae along palmar margin. Gnathopod 2 similar or 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; with or without slender or robust dorsal setae (check). Urosomite 1 without large distoventral robust seta. Urosomite 2 without dorsal setae. Uropod 1 with or without basofacial robust setae. Uropod 3 sexually dimorphic or not; biramous, with or without plumose setae; endopod subequal in length to exopod. Telson deeply to weakly cleft ; dorsal or lateral robust setae present or absent; apical robust setae present or absent.

Habitat. Marine, epigean.

Included genera. Hornellia Walker, 1904 ; Metaceradocus Chevreux, 1925 .

Remarks. d'Udekem d'Acoz (2010) believes that hornelliids are related to liljeborgiids and megaluropods, but these groups do not belong in the senticaudates. For us hornelliids are more similar to cheirocratids.

Distribution. Cosmopolitan.