Diagnosis

English

eng

Medium size, elongate, often with pointed posterior extremity, greatest width posterior to center, rounded margin; apical system monobasal, anterior, four genital pores; petals well developed, broad, closing distally, with broad interporiferous zones, poriferous zones of same petal of same length, pores conjugate, outer pore elongate but not slit-like, ambulacral plates beyond petals single pored; periproct marginal, slightly visible from above or below, longitudinal; peristome transverse, anterior, large, subpentagonal; bourrelets well developed, vertical walled; phyllodes broad, single pored, with two or sometimes three series of pores in each half-ambulacrum; buccal pores present.

Kier, P. M. 1962. Revision of the cassiduloid echinoids. Smithsonian Miscellaneous Collections 144, iv+1-262. available online at https://www.biodiversitylibrary.org/page/24741645 Available for editors