PROC. BIOL. SOC. WASH. 95(3), 1982, pp. 610-620 REDESCRIPTION OF EXOEDICEROS FOSSOR (STIMPSON, 1856) AN AUSTRALIAN MARINE FOSSORIAL AMPHIPOD, THE TYPE-GENUS OF THE NEW FAMILY EXOEDICEROTIDAE J. Laurens Barnard and Margaret M. Drummond Abstract. — The type-species of Exoediceros, for which the type material has been lost, is redescribed from fresh Australian material and compared to its junior synonym Exoediceros arenicola (Has well), for which type-material is available. This is compared to Exoediceros maculosus Sheard (1936), a sympatriot. A new family, Exoedicerotidae, is described to include Exoediceros, Exoediceropsis, Bathyporeiapus , Metoediceros, Parhalimedon, and Patuki, all southern 2-eyed (or blind) genera with apical spination on the rami of uropods 1-2. These are assumed to be more primitive than the advanced Oedicerotidae which have dom-inated the northern hemisphere and the deep-seas. Several genera formerly identified as Oedicerotidae, Exoediceros, Exoedice-ropsis, Bathyporeiapus , Metoediceros, Parhalimedon, and Patuki, are now con-sidered to be distinguishable as a new family to stand in a position plesiomorphic to the Oedicerotidae. The type-species of the type-genus, Exoediceros, is rede-scribed herein so as to establish this family. Legends: Capital letters describe morphological parts; lower case letters to left of capital letters denote specimens cited in figure legends, lower case letters to right of capital letters or in body of drawing are cited in following list: A, antenna; B, body; C, coxa; D, dactyl; E, pleon; F, accessory flagellum; G, gnathopod; H, head; I, inner plate or ramus; J, gill; K, palp; L, labium; M, mandible; N, pleopod; O, outer plate or ramus; P, pereopod; Q, brood plate; R, uropod; S, maxilliped; T, telson; U, prebuccal anterior; X, maxilla; Y, calceolus; Z, aesthetasc; m, medial; r, right; s, setae removed. Exoedicerotidae, new family Diagnosis. — Amphipoda-like Oedicerotidae but apices of rami on uropods 1-2 spinose; eyes, when present, paired. Description. — Body laterally compressed, scarcely or not processiferous, uro-somites 1-3 free. Head not strongly galeate, rostrum medium, thin or weak. Peduncles of antennae medium to short, flagella usually calceoliferous, calceoli probably of oedicerotid kind 7 (Lincoln and Hurley 1981), accessory flagellum 0-1 -articulate. Labrum weakly excavate or entire, epistome occasionally produced. Mandible strong, incisor toothed, raker row well developed, molar triturative to obsoles-cent, palp 0-3 -articulate. Inner lobes of lower lip fleshy and separate. Maxillae well developed, inner plates poorly to strongly setose. Maxillipeds well devel-oped, outer plate small to large, palp 4-articulate. Coxae 1-4 well developed, coxa 4 lobate and excavate or not, coxa 5 generally
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