Sigmodota magdarogera O'Loughlin, sp. nov.

• Main Authors: O'Loughlin, P. Mark, Mackenzie, Melanie, Vandenspiegel, Didier, Griffiths, Huw
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Holothuroidea; Apodida; Chiridotidae; Sigmodota; Sigmodota magdarogera; Antarc*; Antarctica; Weddell Sea
• Online Access: https://doi.org/10.5281/zenodo.6096652; http://treatment.plazi.org/id/0D728790D249FFB3FF755CB9FBBEFEDF

Sigmodota magdarogera O’Loughlin sp. nov. Figures 1–4; key Material examined. Holotype. Antarctica, Weddell Sea, station ‘North-West Brunt Shelf’, AGT 64, 75.091– 75.09233 ºS, 32.21768– 32.21767ºW, agassiz trawl 610.62–611.83 m, BAS cruise JR275 RRS James Clark Ross , collected by M. Mackenzie et al. , 24/02/2012, NHMUK 2014.32. Paratypes. Antarctica, Weddell Sea, station ‘West Brunt Shelf 2’, AGT 59, 75.2658– 75.26645 ºS, 31.14481– 31.15042 ºW, agassiz trawl 607.1–610.24 m, BAS cruise JR275 RRS James Clark Ross , collected by M. Mackenzie et al. , 23/02/2012, NHMUK 2014.33–39 (7), NMV F218844 (1), NMV F218845 (1), NMV F218846 (1). Diagnosis. Sigmodotid species, vermiform, tapered posteriorly, up to 35 mm long (preserved); conspicuous dorsal and lateral wheel papillae, absent ventrally; 12 peltato-digitate tentacles, four pairs of digits, largest distally; radial plates of calcareous ring with low anterior projection, excavations for tentacular ampullae on outer side of plates, lacking perforation for nerve; single polian vesicle; pair of elongate gonad thin tubes or egg-filled sacs. Ossicles in tentacles rods, predominantly closely spinous along shafts, frequently bifurcate and minutely spinous distally, rarely with branch, rods 240–280 µ m long; ossicles in body wall wheels and sigmoid hooks; wheels clustered into discrete papillae dorsally and laterally, wheels rounded hexagonal with six spokes and teeth around inner rim continuous, posterior body wall wheel diameters 67–123 µ m, anterior body wall wheel diameters 64–168 µ m; sigmoid hooks scattered throughout body wall with very fine outer spinelets on the distal outer hook surfaces, posterior body wall hook lengths typically 133 µ m, anterior body wall hook lengths typically 170 µ m. Colour. Alcohol-preserved (briefly): yellowish, semi-translucent, white spots (wheel papillae). Preserved: offwhite. Distribution. Antarctica, Weddell Sea, North-West and West Brunt Shelf, 75ºS, 32ºW, 607– 612 m. Etymology . Named magdarogera for Magdalena Błażewicz −Paszkowycz ...