Alexandrella chione d'Acoz & Verheye 2017, sp. nov.

• Main Authors: d'Acoz, Cédric d'Udekem, Verheye, Marie L.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2017
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Amphipoda; Stilipedidae; Alexandrella; Alexandrella chione; Bransfield Strait; Southern Ocean
• Online Access: https://doi.org/10.5281/zenodo.3857702; http://treatment.plazi.org/id/4A5A879BFF2E68D5FD99FCD2CFE1F81F

Alexandrella chione sp. nov. urn:lsid:zoobank.org:act: 90F1FE7A-F36C-4411-A7A8-833B300A0862 Figs 324–335 Alexandrella australis –? Holman & Watling, 1983a: 33, in part [specimen from RV Eltanin only], not figs 1–3. —? Klages 1988: 82, fig. 20c. —? Berge & Vader 2005a: 1330 –1332, fig. 1. Alexandrella sp. – d’Udekem d’Acoz & Verheye 2013: 62, fig. 3.8.1B (in colour). non Acanthonotozoma australis Chilton, 1912: 205, pl. 2 fig. 19. Etymology From the Greek, χιων, snow. The name, which is a noun in apposition, alludes to the pure white colour of the species. Type material Holotype RV Polarstern cruises SOUTHERN OCEAN: immature ♀, cruise PS81,ANT-XXIX/3, stn 227-2, Bransfield Strait, 62°55.83ʹ S, 58°41.09ʹ W to 62°55.76ʹ S, 58°41.46ʹ W, 562–564 m, muddy bottom, Agassiz Trawl, 5 Mar. 2013, coll. C. d’Udekem d’Acoz and M. Verheye (RBINS, INV. 122887). Description HEAD. Rostrum tiny, extremely narrow in frontal view, reaching 0.3 of article 1 of peduncle of antenna 1 (dorsomedial tooth included); lateral head lobes triangular (forming a sharp squared angle); ventral lobe forming an extremely strong hemi-elliptic protrusion; connection between this protrusion and head forming a deep notch (shape: sharp squared angle). EYES. Circular, small, pale, non-ommatidian, disappearing in alcohol. PEREION–PLEOSOME TOOTH PATTERN. Pereionites 1–6 totally smooth; pereionite 7 posteriorly carinate and with medium-sized tooth projecting backwards; pleonites 1–2 carinate, with medium-sized tooth projecting backwards; pleonite 3 carinate, with distinctly sigmoid profile (distinctly convex in anterior 0.8, distinctly concave in posterior 0.2), with medium-sized tooth projecting backwards. EPIMERAL PLATES 1–3. Posteroventral angle: very obtusely rounded in plate 1, produced into a mediumsized tooth in plates 2–3. UROSOME ORNAMENTATION. Urosomite 1 with deep notch on proximal third, followed by elevated carina, anteriorly rounded and slightly produced forward, dorsally nearly straight (posteriorly very slightly concave), ...