Crispatotrochus rugosus Cairns 1995

Corallum ceratoid, elongate, usually curved, and slightly flared distally. Specimens can be attached to an older coralla near the calicular margin. Pedicel robust and massive (PD:GCD = 0.32–0.45), expanding to a thin encrusting base. Calice slightly elliptical (GCD:LCD = 1.05–1.1), and serrated, however, small specimens sometimes display a hexagonal calicular margin with each corner corresponding to each S1. Theca covered with thin transverse ridges, which are more prominent near base. Well preserved coralla bear slightly ridged costae (C1–4) separated by very thin shallow striae. Corallum white, but a specimen from New Caledonia has C–1 and upper edges of S1–2 pigmented brown. Septa hexamerally arranged in four complete cycles according to formula: S1>S2>S3>S4. S1 highly exsert (up to 3 mm), thicker than higher septal cycles, with rounded upper margin, and vertical sinuous axial edges almost reaching columella. S2 less exsert, about four fifths width of S1, and have very sinuous axial edges. The sinuosity of secondaries starts above the sinuosity of the primaries. S3 equal to slightly less exsert, but wider and more sinuous than S4. Usually the sinuosity of tertiaries starts above sinuosity of secondaries. Upper outer edges of S4 fuse to the adjacent S1 or S2, becoming more exsert than S3. Fossa of moderate depth containing a columella composed of 3–5 slender twisted elements.

New Caledonia; Wallis and Futuna – Combe and Field Banks; Vanuatu – Tanna, Efaté, Epi, and Espiritu Santo; Australia – off Cape Leveque (western Australia); Philippines – Verde Island Passage; Malaysia – Sabah (Celebes Sea); Kermadec Islands; Lord Howe Seamount Chain; 142–616 m.

azooxanthellate

142-1050 m

shelf to slope