Crispatotrochus galapagensis Cairns 1991

Crispatotrochus galapagensis

?Cyathoceras sp.—Durham and Barnard, 1952:90.

DESCRIPTION OF HOLOTYPE.—Corallum ceratoid: 7.6 × 7.1 mm in calicular diameter, 11.0 mm tall, and firmly attached to substrate through a pedicel 3.8 mm in diameter, which expands into an encrusting base approximately 6.5 mm in diameter. Costae indistinct, slightly incised only near calicular edge. Theca smooth, porcellaneous, and white, masking an underlying granulation.

Septa hexamerally arranged in four complete cycles (48 septa). S1–2 equal in size and highly exsert (up to 1.6 mm), with extremely sinuous, vertical inner edges that fuse to the columella at their lower edges. S3 less exsert (up to 1.2 mm), with slightly less sinuous inner edges, extending about 0.8 distance to columella. S4 quite small, extending only about one third distance to columella, and have slightly sinuous inner margins. Septal face granulation consists of sparse, low granules about 0.10 mm tall. Fossa nonextant, being entirely filled with a fascicular columella consisting of 6 or 7 broad, loosely twisted laths interconnected among themselves. Tips of columellar laths extend slightly above calicular edge.

azooxanthellate

84-806 m

Known from seamounts and knolls