The Echinoid Directory

Hypselolampas Clark, 1917, p. 109

Diagnostic Features	Test of medium size, elongate, inflated, with a smoothly rounded anterior margin and a slightly pointed or slightly truncated posterior margin. Oral surface weakly depressed around peristome Apical system anterior, monobasal, with three genital pores, no pore in the left anterior genital plate Petals long, open, straight, extending almost to margin; adjacent pore pairs widely spaced, ambulacral plates beyond petals single pored Peristome subcentral to slightly anterior, a little longer than wide Periproct marginal, longitudinal Bourrelets well developed; projecting as low mounds Phyllodes slightly widened, single pored; comprising few pores (6-8) in outer series in each half-ambulacrum plus usually just a single pore insert representing the inner series Buccal pores present Tubercles slightly larger adorally, no naked granular zone in interambulacrum 5
Distribution	Recent, Indo-Pacific
Name gender	feminine
Type	Catopygus recens A. Agassiz, 1879, p. 204; by original designation.
Species Included	Only the type species
Classification and/or Status	Irregularia; Cassiduloida; Neolampadidae Subjective junior synonym of Studeria Duncan, 1891.
Remarks	Clark (1917, p. 104) appears to have erected this genus on the premise that Studeria elegans (the type species of Studeria) does not appear to be congeneric with S. recens. However, Clark (1917) fails to give diagnostic characters by which to differentiate these genera. Kier (1962) reports that after studying Agassiz\'s figure he cannot identify characters of sufficient importance to warrant generic distinction. Having studied both type species we are in agreement with Kier, the type species are almost certainly congeneric and therefore Hypselolampas should be regarded as a subjective junior synonym of Studeria. H. L. Clark. 1917. The Echinoneidae, Nucleolitidae, Urechinidae, Echinocorythidae, Calymnidae, Pourtalesiidae, Paleostomatidae, Aeropsidae, Palaeopneustidae, Hemiasteridae, and Spatangidae. Memoirs of the Museum of Comparative Zoology, 46 (2), 81-284, pls 144-161. P. M. Kier. 1962. Revision of the cassiduloid echinoids. Smithsonian Miscellaneous Collections 144, (3), 262 pp.