Pseudopleonexes Conlan, 1982

Just, J., 2002, Review of Pseudopleonexes Conlan, 1982, With a New Species from Australia (Crustacea: Amphipoda: Ampithoidae), Records of the Australian Museum 54 (1), pp. 31-40 : 36

Pseudopleonexes Conlan, 1982

Diagnosis. (Based on Conlan, 1982, with input from Barnard & Karaman, 1991 and the new species described below; cf. Table 1 and attendant discussion.) Ocular lobes produced, antennal sinus present. Antenna 1 peduncle article 3 shorter than 1; accessory flagellum absent. Epistome and upper lip directed backwards at approximately 45 degrees from the vertical. Upper lip subrounded, entire. Mandibular molar conical, triturative; palp moderately well developed, 3-articulate. Lower lip, outer lobes barely notched; mandibular lobes short, thick, pointed. Maxilla 1 palp reduced, with simple setae apically; outer plate with 10 robust setae; inner plate linguiform with a few short midmedial setae. Maxilla 2 inner plate with medial marginal setae only. Maxilliped outer plate reaching to apex of palp article 2. Gnathopod 2 larger than 1. Gnathopods 1 and 2, article 6 longer than 5. Gnathopod 1 palm variable. Gnathopod 2 weakly subchelate, article 2 dilated, articles 5–6 in male strongly setose medially. Coxal plate 1 not forward produced; plates 1–5 of equal length, none longer than wide, with 1 longer seta posteroventrally. Pereopods 3–4 article 2 strongly inflated. Pereopods 5–7 dissimilar, prehensile, 5 much shorter than 6–7; article 2 of pereopod 5 posteriorly lobed, of 6–7 without lobe. Uropod 1 reaching to approximately the middle of peduncle of uropod 2. Uropods 1–2 rami much shorter than peduncle.

Uropod 2 peduncle in male with broad, rounded distolateral lobe. Uropod 3 outer ramus with 2 uncini, one of which weakly bifid, and transverse dorsal rows of acute cuticular scales; inner ramus shorter than outer ramus, pad-like, apically setose. Telson triangular, apically with 2 upcurved, fleshy hooks. Gills on gnathopod 2 and pereopods 3–6.