Tirons of the world: a review of ‘ tironid’ amphipods, description of new genera and species, and establishment of a new subfamily Tironinae Stebbing, 1906 stat. nov. (Crustacea, Synopiidae) Author Just, Jean text Zootaxa 2022 2022-05-23 5139 1 1 89 http://zoobank.org/145cb6f5-2ea8-40b0-9cca-3e942aa4a5b9 journal article 95147 10.11646/zootaxa.5139.1.1 8ab25605-ec09-4d57-9dbd-7da2b032e5e8 1175-5326 6572023 145CB6F5-2EA8-40B0-9CCA-3E942AA4A5B9 Pseudotiron coas J.L. Barnard, 1967 Pseudotiron (?) coas J.L. Barnard, 1967 , 164–167, fig. 81. Pseudotiron coas .—J.L. Barnard 1972 , p. 75 . Type Material . Holotype , ♂ , 3 mm .—Original designation; unique ( AHF No. 6038). Distribution . Cedros Trench, Baja California , 2667–2706 m . Remarks . In his description of Pseudotiron (?) coas J.L. Barnard (1967) expressed some doubt as to whether the species belonged in that genus. He did not repeat or comment on his doubt in a subsequent brief diagnosis of the species (J.L. Barnard, 1972 ). Pseudotiron coas shares with P. bouvieri the distinctive head-shape with a short, rounded rostrum and a straight, vertical lateral margin joining the lower margin in a rounded, nearly right angle; gnathopods are simple, elongate; pereopods 3–7 are typically pre-stubby; the telson is elongate and fully cleft; uropod 3 rami of subequal length, with some apical robust setae apparently broken off (sockets visible on both rami). The main difference between Pseudotiron coas and P. bouvieri is the shape of coxal plate 3, which is shown by J.L. Barnard (1967 , fig. 81k) to be nearly rectangular with concave posterior margin, as opposed to the pelagont, angular posterior projection of the latter species.