Paraliotipoma, Mclean, 2012

Mclean, James Hamilton, 2012, New species and genera of colloniids from Indo-Pacific coral reefs, with the definition of a new subfamily Liotipomatinae n. subfam. (Turbinoidea, Colloniidae), Zoosystema 34 (2), pp. 343-376 : 372

Genus Paraliotipoma n. gen.

TYPE SPECIES. — Paraliotipoma sirenkoi n. sp.

DIAGNOSIS. — Profile moderately high, with projecting peripheral carination, with weaker cords on shoulder and base, axial sculpture of about 20 primary ribs extending across shoulder and base; axial sculpture extending to partially obstruct umbilicus in final quarter whorl; umbilicus narrow; final whorl expanding, projecting; lip not angular, thickened by repeating lamellae.

DISTRIBUTION. — Known only from type species, from Chimetan Bank, South China Sea (west of Palawan, Philippine Islands).

REMARKS

This genus is clearly a member of Liotipomatinae n. subfam., for its fine axial lamellae, similar size to Liotipoma , shell profile with a peripheral angulation and projecting final lip. It differs from Liotipoma in having the lip profile in basal view more rounded, rather than angulate as in Liotipoma , and it does not have the tongue that extends from the base of the inner lip and projects across the umbilicus as in Liotipoma . The basal cords are narrower than is usual in the species of Liotipoma .

The fine lamellae between the primary axial ribs that approach the final lip are enlarged, as in Rhombipoma n. gen.