Cidaris smithi Clark and Twitchell 1915 (pencil urchin)

Echinoidea - Cidaroida - Cidaridae

Full reference: W. B. Clark and M. W. Twitchell. 1915. The Mesozoic and Cenozoic Echinodermata of the United States. United States Geological Survey Bulletin 54:1-341

Belongs to Cidaris according to W. B. Clark and M. W. Twitchell 1915

See also Cooke 1941

Sister taxa: Cidaris (Cidaris), Cidaris admeto, Cidaris alabamensis, Cidaris alata, Cidaris alpis, Cidaris baculifera, Cidaris blandis, Cidaris bowerbankii, Cidaris branneri, Cidaris californicus, Cidaris catenifera, Cidaris cojimarensis, Cidaris cornaliae, Cidaris cubensis, Cidaris curioni, Cidaris dilleri, Cidaris dixiensis, Cidaris fasciculata, Cidaris flexuosa, Cidaris fumagalli, Cidaris georgiana, Cidaris guembeli, Cidaris klipsteini, Cidaris liagora, Cidaris lorenzanus, Cidaris loveni, Cidaris martinezensis, Cidaris modestus, Cidaris moereus, Cidaris mortoni, Cidaris omboni, Cidaris ordinatus, Cidaris parastadifera, Cidaris perdubius, Cidaris perornata, Cidaris plumasensis, Cidaris pratti, Cidaris schlonbachi, Cidaris serrifera, Cidaris shastensis, Cidaris splendens, Cidaris subnobilis, Cidaris subnodosa, Cidaris taylorensis, Cidaris tehamensis, Cidaris texanus, Cidaris tribuloides, Cidaris tubuloides, Cidaris wahalakensis

Type specimen: Its type locality is The Rocks, which is in a Priabonian foreshore claystone in the Yazoo Formation of Alabama

Ecology: slow-moving low-level epifaunal grazer-omnivore

Distribution: found only at The Rocks

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