| Summary: | Spirodiscus ottofinamusi sp. nov. urn:lsid:zoobank.org:act: D1A2535B-20DD-4B68-BEE0-CB12A63DE5F4 Figs 1–5 Holotype Op 98, Australia, New South Wales, off Byron Bay (28°22'17"S 154°38'50"E), 8 June 2017, 3811– 3754 m, Australian Museum (AM) W.54171. Paratypes AM W.49511, as above (5 spec.). Additional material . Op. 66, Australia, New South Wales, off Newcastle (33°26'54"S 152°43'58"E), 30 May 2017, 4378– 4195 m: W.49691 (2 spec.). Op 79, Australia, New South Wales, Hunter Commonwealth Marine Reserve (32°7'51"S 152° 31'38"E), 4 June 2017, 4031 m: W.49683 (2 spec.). Op 98, Australia, New South Wales, off Byron Bay (28°22'17"S 154°38'50"E), 8 June 2017, 3811– 3754 m: W.49704 (20 spec.), W.49687 (6 spec.). Op 103, Australia, Queensland, off Moreton Bay (27°1"S 154°13'23"E), 10 June 2017, 4260–4280 m: W.49671 (1 spec.), W.49684 (16 spec.), W.49685 (3 spec.), W.49740 (53 spec.). Op 110, Australia, Queensland, off Fraser Island (25°13'11"S 154°9'37"E), 11 June 2017, 4005–4010 m: W.49512 (3 empty tubes.), W.49686 (15 spec.), W.52131 (1 spec.). Comparative material examined Spirodiscus groenlandicus (McIntosh, 1877) — W.46398, North Atlantic Ocean, Porcupine Seabight, off Brittany (50°4'N 13°55'36"W), 15 April 1978; W.46399, western Indian Ocean, Mozambique Channel, north of Madagascar, south-east of Glorioso Islands (11°44'S 47°30'E), 4 April 1977. Bathyditrupa hovei Kupriyanova, 1993 —W.46391, North Atlantic Ocean, Iberian Basin, west of southern Spain (37°18'N 15°33'W), 17 May 1981; W.46392, North Atlantic Ocean, Iberian Basin, north of Madeira (34°6'6"N 17°6'18"W), 30 May 1981; W.46394, North Atlantic Ocean, Iberian Basin, west of northern Spain (42°51'12"N 15°55'18"W), 11 Jun 1981. Description Tube : Less than 1 cm long, 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 (Figs 1E, 4A,B). In spaces between two neighbouring keels (forming one pair) walls slightly thicker than in spaces ...
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