The Echinoid Directory

Porocidaris Desor, 1855, p. 46

[Parocidaris Nobre, 1909, p. 19 (misspelling) ]

Diagnostic Features	Test large and relatively thin-plated. Apical disc unknown. Interambulacra with some 8-10 plates in a column. Primary tubercles central; ovate, perforate, strongly crenulate. Areoles incised and confluent ambitally. Scrobicular tubercles not really differentiated; extrascrobicular zones developed only on adradial and interradial margins and relatively uniform. Ambulacra rather straight with pore-zones sunken. Pore-pairs conjugate, the two pores widely separated. perradial zone also broad, with horizontal row of small, separated tubercles to each plate. Peristome unknown. Primary spines short and blade-like with serrated margins and fine granular ornament. Collar long and distinctly granular.
Distribution	Middle Eocene, North Africa, India and the Middle East.
Name gender	feminine
Type	Cidarites schmidelii Munster, 1843, p. ***, by subsequent designation of Lambert & Thiery, 1910, p. 108.
Species Included	Only the type species is based on reasonably complete test fragments (Lambert & Thiery 1914, p. 138, list 3 other species).
Classification and/or Status	Cidaroida; Rhabdocidaridae. Monotypic.
Remarks	Highly distinctive rhabdocidarid because of the radial grooves that are so well developed around the outer part of its primary tubercle areoles. Desor, E. 1855-1858. Synopsis des echinides fossiles. Reinwald, Paris. 490 pp., 44 pls. [part published April, 1855] Lambert, J. & Thiery. P. 1909-1925. Classification raisonnees des echinides vivants et fossiles. Chaumont, Ferriere.