Deltocyathus suluensis Alcock 1902

Corallum circular with base fl at to slightly convex. Calicular margin serrate but not lancetted. Costae present as round granular ridges separated by well-defi ned same width intercostal furrows. Only C1-2 originates at centre of base. Septa hexamerally arranged in 5 complete cycles (S1≥S2>S3>S4>>S5). S1 only independent septa and extend half distance to columella, being separated from their pali by a moderately wide notch. Higher septal cycles progressive less wide. S1-4 and P1-4 arranged in a typical Deltocyathus fashion, fusing through porous processes. S5 rudimentary. Fossa shallow containing a well-developed papil- lose columella.

New Caledonia waters from 21°00.83’S, 164°27.34’E to 24°44’S, 169°49.15’E (Kitahara & Cairns, 2009), 416-752 m. Previous records: Indian Ocean off western Australia from Dampier Land to Port Hedland (Cairns 1998; 2004), 401-530 m; Pacifi c Ocean from Philippines and Indonesian region (Cairns & Zibrowius 1997), 204-540 m to southern Norfolk Ridges, New Zealand (Cairns 1995), 142-565 m, including Wallis and Futuna region and Vanuatu region (Cairns 1999), 400-650 m, and off Queensland, Australia (Cairns 2004), 246-1050 m.

azooxanthellate

142-1050 m