Rhachotropis abyssalis Lörz, 2010, sp. nov.

• Main Author: Lörz, Anne-Nina
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2010
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Eusiridae; Rhachotropis; Rhachotropis abyssalis; Antarc*; Antarctica; Ross Sea
• Online Access: https://doi.org/10.5281/zenodo.6204006; http://treatment.plazi.org/id/03B187EA1276FFF9FF0AFCED0743FCC7

Rhachotropis abyssalis sp. nov. (Figs 13–17) Material examined . Holotype: NIWA 60483, male, 13.2 mm, TAN0802/ 288, Brenke sled, 66°45.28’S, 171°9.7’E, 12 March 2008, depth 3379–3380 m, Admiralty seamount, Ross Sea, Antarctica. Paratypes: NIWA 60484, female, 13.2 mm, photographed on board immediately after sampling (Fig 17); damaged female, 15.5 mm; damaged male, 13.4 mm; all paratypes same collection data as holotype. Etymology. Rhachotropis abyssalis sp. nov. is named for the abyssal habitat in the northern Ross Sea from which the species was collected. Diagnosis. Body delicate. Rostrum longer than head. Antenna as long as body. Eyes absent. Head twice as long as pereonite 1, lateral lobes strongly produced. Pereonites smooth. Pereopod 7 longer than body. All pleonites bearing dorsal processes. Pereonite 3 indented. Urosomite 1 bearing dorsal process, urosomites 2 and 3 smooth. Telson cleft, long and narrow. Description. Antenna 1 and 2 equal in length. Antenna 1 article 2 of peduncle with several plumose setae, article 2 slightly shorter than first article, twice as long as third article; flagellum 67 articles, the first 22 articles very short and bearing many setae. Antenna 2 peduncle article 4 shorter and wider than article 5, with several plumose setae, flagellum of 65 articles. Mandible with incisor process well developed, lacinia mobilis denticulate, molar process conical; palp article 1 short, about one fifth of article 2; article 3 longer than 2; articles 2 and 3 with long slender setae. Maxilla 1 inner plate bearing 1 subterminal plumose seta; outer plate with 9 denticulate spines; article 2 of palp with several slender setae at tip; palp twice as long as outer plate. Maxilla 2 inner and outer plate subequal in length; margins bearing stout and slender setae; inner plate wider than outer plate with 1 plumose seta. Maxilliped palp more than twice length of outer plate; article 2 of palp with epibionts. Maxilliped outer plate twice as long as inner plate, not reaching half of article 2 of maxillipedal ...