Stebbing, 1888
Body smooth. Rostrum small to large. Eyes very small or absent. ANT I longer than or subequal to ANT II; calceoli present. ART 1 of peduncle of ANT I (Cleonardo longipes 2) subequal to head, ART 2 not shorter than ART 1, ART 3 not produced, in males twice as short as ART 1 of main flagellum; accessory flagellum uni-articulate or absent. Epistome not produced. Mandibular molar columnar, triturative, ART 2 of mandibular palp without lobes. Inner lobe of MX I with 2 apical setae (1 seta in Pacific species C. macrocephala). Inner lobe of MX II subequal in length to, but broader than (sometimes slightly), outer lobe. Lower lip with small inner lobes. CX I not strongly produced anteriorly. P I and II large, subchelate, with distinct palmar margins and palmar spines, not of eusirid form; ART 5 shorter than 6, with strong posterior lobes. P III-VII elongate, simple, ART 4-6 each much longer than ART 2, dactyls long (Cleonardo longipes, Cleonardo longipes 1). Epimeral plate III with smooth posterior margin, sharp posteroventral corner. Exopodites of UR I-III shorter than endopodites. Telson cleft.
Eight species, cold- or deep-water. Still not found in the South Atlantic, but widely distributed in world ocean. Cleonardo longipes Walker, 1906, which may be found in the region, is described here.