Pleojassa wandeli Conlan 2021, new combination

• Main Author: Conlan, Kathleen E.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Ischyroceridae; Pleojassa; Pleojassa wandeli; Signy Island; South Orkney Islands
• Online Access: https://doi.org/10.5281/zenodo.4534329; http://treatment.plazi.org/id/03DFE565EA4DD452FF133642D185FD73

Pleojassa wandeli (Chevreux, 1906) new combination (Figs 29–34) Jassa wandeli Chevreux, 1906, 94–99, Figs 54–56; 1913, 181, Fig. 61; J. L. Barnard, 1958, 85. Jassa falcata : Sexton & Reid, 1951, 73–74; (form 1) Thurston, 1974a, 46–47: 1974b, 101–102; Lowry & Bullock, 1976, 73. Description of male. (Not type; Billie Rocks, Signy Island, South Orkney Islands, 5 March 1965, M. H. Thurston, coll. (NHM 1969:735:39 station 10 (95)). Length 9.8 mm. Antenna 2 : overlapped by antenna 1 to midway along article 5; article 5 and flagellum, posterior margin covered in a mass of plumose setae; simple setae absent; flagellum 3 articles, the last half the length of the second; article 1 87% of full flagellum length. Mandible : palp articles 2 and 3 without a dorsal fringe of setae; raker spines 4 right, 5 left. Gnathopod 1 : coxal margins, anterior 113% of dorsal length; ventral margin straight; basis, anterior margins with a few fine setae spaced along their length, posterior margin with a single distal seta; carpus, length 65% of propodus length, posterior lobe 50% of anterior margin length, anterodistal setal cluster short, 39% of the anterior margin length; propodus, palm convex, with one defining spine slightly proximal of centre. Gnathopod 2 : coxal margins, anterior 21% and posterior 83% of ventral length, ventral margin straight; carpus less than a quarter the length of the propodus, posterior lobe without a distal seta; propodus, palm, hinge tooth rectangular cuboid, shallowly bifid centrally, setae sparse but spread throughout the palm, thumb 36% of propodus length, distally squared, posterior margin straight, with clusters of setae subapically, and 3 groups posteriorly, and with 1 minute defining spine at its tip. Pereopod 3 : coxa, greatest depth at the centre; basis, anterior margin straight; merus, anterior marginal setae in discrete, well spaced clusters, about a third the article width, article width 61% of length; carpus 44% overlapped by the merus; propodus, width 56% of length. Pereopods 5–7 : setae ...