Spirodiscus groenlandicus McIntosh 1877, comb. nov.

• Main Authors: Kupriyanova, Elena K., Ippolitov, Alexei P.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2015
• Subjects: Biodiversity; Taxonomy; Animalia; Annelida; Polychaeta; Sabellida; Serpulidae; Spirodiscus; Spirodiscus groenlandicus; North Atlantic; North East Atlantic
• Online Access: https://doi.org/10.5281/zenodo.5324180; http://treatment.plazi.org/id/741287F4FFED8C28FF25FB7296192376

Spirodiscus groenlandicus (McIntosh, 1877) comb. nov. Figures 1 D, 6, 7 Ditrypa [SiC!] groenlandica McIntosh, 1877: 219. Ditrypa groenlandica .— McIntosh 1879: 509, fig. 1A–B.— Hartman 1959: 573.—1971: 1426.— Zibrowius 1977: 292. Ditrupa grönlandica .— Ditlevsen 1914: 732. ? Filogranula spp.— Hartman & Fauchald 1971: 182 [in part, only in R/V CHAIN St. 85]. Material examined. R/V DISCOVERY, cruise 92, North-East Atlantic, south-west of Ireland: St. 9756 #14, 15.4.1978, 50°04.0'N, 13°55.6'W, 3680–3697 m ( neotype NHMUK ANEA 2015.972, 1 spec. prepared for SEM AM W.46398). R/V CRYOS, cruise ABYPLAINE: St. 10-DS10, 11.6.1981, 42°51.2'N, 15°55.3'W, 4270–4360 m (4 spec. MNHN PNT 26, 3 spec. SMF 23973, 1 spec. prepared X-ray diffraction analysis sample #1). R/V LE SUROIT, cruise BENTHEDI, North Madagascar: St. 87 CH, 3.4.1977, 11°44'S, 47°35'E, 3716 m (5 spec. NBCL ZMA V. P o l 5542, 3 spec. LACM-AHF Poly 7015, 3 spec. NHMUK ANEA 2015. 973–975); St. 90 CH, 4.4.1977, 11°44'S, 47°30'E, 3700 m (3 spec. in tubes plus 1 removed, AM W.46399, tube fragments prepared for SEM PIN 5485/12 and X-ray diffraction analysis sample #2, 2 spec. USNM 1283053). R/V MARION DUFRESNE, cruise MD 20, South-Eastern Madagascar: St. 15-CP8, 2.9.1979, 31°52.0'S, 48°28.8'E, 3825 m (1 spec. SMF 23972). R/V CHAIN, St. 85, 37°59.2’N, 69°26.2’W, 3834 m (53 spec. and tubes LACM-AHF ). R/V VITYAZ-2, North Atlantic Ocean, St. 79, 34° 54.3N, 45°39.0’W, 4440 m (1 dry spec. in tube SIO ). Description. Tube : white opaque, free-lying, tusk-shaped, slowly expanding, octagonal in cross-section, with 8 smooth keels (longitudinal ridges) arranged all around the tube and grouped by pairs (Fig. 6 F, 7B). In spaces between two neighbouring keels (forming one pair) walls slightly thicker than in spaces separating different pairs. Sides between keels concave. Short growth stops resembling tiny irregularly displaced transverse constrictions present. Tube ultrastructure : wall (Fig. 6 A) with two layers consisting of elongated rice grain-shaped crystals. Inner ...