Type genus. Bathyporeia Lindstrom, 1855.
Diagnostic description. Body laterally compressed. Eyes present, well developed, reniform. Antennae 1–2 calceoli gammarid (type 1). Antenna 1 shorter than antenna 2; peduncular article 1 longer than article 2; longer than article 3; shorter than article 1; peduncular articles 1–2 geniculate; peduncular articles 2–3 not geniculate; accessory flagellum minute. Antenna 2 peduncular article 1 not enlarged. Mandible molar non-triturative or with tiny triturating patch; palp symmetrical. Maxilla 1 basal endite setose along medial margin; 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 absent; oostegites fringing setae simple. Gnathopod 1 subchelate; similar in males and females (not sexually dimorphic); smaller (or weaker) than gnathopod 2 or 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 not produced along posterior margin of propodus, projecting between merus and propodus. Pereopods 3–4 not sexually dimorphic. Pereopod 4 with well developed posteroventral lobe. Pereopod 5 shorter than pereopod 6; coxa equilobate. Pereopod 7 longer than pereopod 5. Pleonites 1–3 without dorsal carinae. Urosomites 1–3 free; with 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 not sexually dimorphic; biramous, with few plumose setae; endopod minute. Telson deeply cleft; dorsal or lateral robust setae present; apical robust setae present.
Habitat. Marine, epigean.
Included genera. Amphiporeia Shoemaker, 1929; Bathyporeia Lindstrom, 1855.
Distribution. North Atlantic Ocean, Mediterranean and Black Seas.