Cidaris shastensis 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 J. P. Smith 1927

See also Clark and Twitchell 1915, Grant and Hertlein 1938 and Kier 1968

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 smithi, Cidaris splendens, Cidaris subnobilis, Cidaris subnodosa, Cidaris taylorensis, Cidaris tehamensis, Cidaris texanus, Cidaris tribuloides, Cidaris tubuloides, Cidaris wahalakensis

Type specimen: USNM 31188. Its type locality is Round Mountain, west, which is in a Triassic marine horizon in the Cedar Formation of California.

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

Distribution: found only at Round Mountain, west

Show more details


Specimen images are retrieved through the ePANDDA API.


Click image to enlarge. Click to access iDigBio record.