Cidarina cidaris, common name Adam's spiny margarite, is a species of sea snail, a marine gastropod mollusk in the family Eucyclidae.[1] [2]
The height of the gray to grayish white shell attains 20 mm.
(Original description in Latin by Carpenter) "Testa magna, conica, Turcicoidea, tenui ; albido-cinerea, nacreo-argentata ; anfr. nucleosis —? (decollatis), norm, vii, subplanatis, suturis alte insculptis ; superficie spirae tota valide tuberculosa, seriebus tribus, alteris postea intercalantibus; peripheria et basi rotundatis, carinatis; carinis circ. 8, haud acutis, irregularibus, scabris, haud tuberculosis; lacuna umbilicali vix conspicua ; apertura subrotundata ; labro tenuissimo; labio obsoleto ; columella arcuata. "
This species occurs in the Pacific Ocean from Alaska to Baja California.