Pachynus barnardi Hurley, 1963

Lowry, J. K. & Stoddart, H. E., 2012, The Pachynidae fam. nov. (Crustacea: Amphipoda: Lysianassoidea) 3246, Zootaxa 3246 (1), pp. 1-69 : 38

Pachynus barnardi Hurley, 1963

Pachynus barnardi Hurley, 1963: 31 , figs 6, 7. ―J.L. Barnard, 1966a: 70. ―J.L. Barnard, 1966b: 26. ―J.L. Barnard, 1969b: 218, figs 25a–c. ―J.L. Barnard, 1971: 44. ― Lowry, 1984: 78, fig. 24. ― Austin, 1985: 601. ― Barnard & Karaman, 1991: 510. ― García-Madrigal, 2007: 107.

Pachynus sp. J .L. Barnard, 1964: 232.

Diagnostic description. Antenna 1 peduncular article 1 without posterodistal spine; accessory flagellum present, 2-articulate, article 1 short; flagellum with weak 1-field callynophore in female, [male not known]. Mandible lacinia mobilis a simple robust seta; lamina dentata absent; accessory setal row absent; molar absent; palp attached midway; palp article 2 slender, longer than article 3; article 3 with anterior margin convex, not strongly tapering distally, with anterior margin convex. Maxilla 1 outer plate with 8 setal-teeth in 5/3 arrangement, setal-teeth smooth; palp well developed, 2-articulate, with apical robust setae. Maxilliped inner plate small; outer plate small; palp 4-articulate, article 4 large. Gnathopod 1 chelate; ischium smaller than propodus, not swollen posteroproximally; carpus extremely compressed; propodus length about 1.5 × breadth, posterior margin well developed, palm with produced corner, corner of palm with complex robust seta; dactylus reaching to corner of palm. Gnathopod 2 propodus length less than 2 × breadth, palm minute, transverse. Pereonite 4 without dorsal spines. Pereonite 5 without dorsal spines. Pereopod 5 merus with posteroproximal shoulder. Pereopod 6 basis with posteroventral lobe produced beyond ischium; merus as broad as long, with posteroproximal shoulder. Pereopod 7 basis subovate, about as long as wide with posterior margin smooth or weakly dentate. Epimeron 3 posterior margin without projections, posteroventral corner subquadrate. Uropod 3 biramous, inner ramus just reaching base of article 2 of outer ramus. Telson entire.

Remarks. This species is very similar to P. chelatum , as discussed under that species. It is possible that some of the material reported in the literature as P. barnardi , such as that of J.L. Barnard (1971) from Oregon, could be P. chelatum .

Distribution. Oregon to southern Mexico, Gulf of California, eastern North Pacific Ocean; 30–800 m depth.