Pseudotiron coas J.L. Barnard, 1967

Just, Jean, 2022, 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), Zootaxa 5139 (1), pp. 1-89 : 71

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.