New species and genera of colloniids from Indo-Pacific coral reefs, with the definition of a new subfamily Liotipomatinae n. subfam. (Turbinoidea, Colloniidae) Author Mclean, James Hamilton Natural History Museum of Los Angeles County, 900 Exposition Blvd, Los Angeles, California 90007 (USA) jmclean @ nhm. org jmclean@nhm.org text Zoosystema 2012 2012-06-30 34 2 343 376 http://dx.doi.org/10.5252/z2012n2a10 journal article 10.5252/z2012n2a10 1638-9387 5165469 Genus Rhombipoma n. gen. TYPE SPECIES. — Rhombipoma rowleyana n. sp. DIAGNOSIS. — Whorl profile low, rounded; with whorl expansion to make final quarter whorl more projecting, sculpture of about 22 axial ribs; axial ribs absent in on final ∕₆ whorl, replaced by more prominent lamellae (lamellae not evident on earlier whorls); the final prominent lamellae continue to form the final lip; spiral sculpture of two beaded cords at periphery; lip very strongly projecting, of eight projecting axial lamellae. DISTRIBUTION. — Known only from type species, from shallow sublittoral depths, Rowley Shoals, off northwestern Western Australia . REMARKS This genus is comparable to Depressipoma n. gen. in its small size and low profile, differing in having a rounded, rather than carinate periphery, and in having reduced spiral sculpture on the shoulder and base, compared to that of Depressipoma n. gen. and Liotipoma . Whorl expansion is most extreme for all members of the subfamily. The final lip is more projecting than in species of Liotipoma and Depressipoma n. gen. , and the lamellae of the projecting lip are larger and fewer, matched in prominence by the lamellae that precede the final lip.