Fissarcturus walteri Brandt, 2013, sp. nov.

• Main Author: Brandt, Angelika
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2013
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Antarcturidae; Fissarcturus; Fissarcturus walteri; Southern Ocean; Ross Sea; Hallet; Antarc*
• Online Access: https://doi.org/10.5281/zenodo.6151671; http://treatment.plazi.org/id/DC1C8790AC6AFFFAF3F4FF0BFBEFF82F

Fissarcturus walteri sp. nov. (Figs 2–6) Material examined. Holotype. 3 (11.5 mm), ZMH K- 43512; Cape Hallet, station H in 5, 16 February 2004, 72°17.2’S 170°17.9’E, 84 m depth, Rauschert dredge. Paratype. Juvenile (7.2 mm), ZMH K- 43513, collected from same locality as holotype. Type locality. Southern Ocean, Ross Sea, Cape Hallet. Composition. For species composition see Poore & Schotte 2012 (World list of Marine Isopoda). Diagnosis. Supraocular spines blunt, short, anteriorly directed, followed by small pair of oval elevations and larger pair of rounded elevations on posterior margin of cephalon. Supracoxal spines reduced to small blunt rounded elevations. Description of holotype male. Body (Fig. 2) in lateral and partly dorsal view, 5.75 times as long as wide, dorsally mostly smooth, with only shallow elevations and few blunt spines on pleotelson and shallow blunt supracoxal elevations laterally on pereonites. Supraocular spines short, blunt directed frontally, followed by pair of oval elevations and larger pair of rounded elevations on caudal margin of cephalon. Coxal plates small lobes with shallow elevations, without setae. Eyes black in fixed condition, slightly protruding laterally. Cephalon lightly narrower than pereonite 1 (0.9); fused with pereonite 1 to form cephalothorax, smooth, with laterally rounded elevation on coxal plate of pereonite 1. All following pereonites smooth, without spines. Pereonite 1 as long as 2 and about as wide as pereonites 1–4, pereonite 4 longest, 1.3 times as long as pereonite 3. Pereonites 5–7 slightly decreasing in length, pereonite 5 broadest of the posterior pereonites and only slightly shorter than pereonite 4. All pleonites fused to pleotelson, pleonite 1 and 2 indicated with suture line, Pleonite 3 dorsolaterally indicated by smooth lateral suture lines. Pleotelson 0.3 body length. Pleotelson with caudally directed lateral spines on fused pleonites, third pleonite medially with 2 blunt, short, caudally directed spines. Pleotelson with 2 laterocaudal blunt spines ...