The Echinoid Directory

Adytaster Lambert, 1895, p. 162

Diagnostic Features	Test ovate, effectively without anterior sulcus; ambitus rounded; posterior truncate. Apical disc structure unknown. Anterior ambulacrum ?weakly sunken adapically; pore-pairs small, different from the petal pore-pairs in other ambulacra. Petals cruciform; weakly sunken; anterior and posterior petals subequal in length. Peristome small, subcircular and closer to centre than anterior. Plastron plating unknown. Periproct small and towards top of posterior truncate face. No fascioles.
Distribution	Eocene, Spain.
Name gender	masculine
Type	Cyclaster lucentinus Cotteau, 1890, p. 47, by original designation.
Species Included	Only the type species.
Classification and/or Status	Spatangoida, family indet. Monotypic.
Remarks	Too poorly known at present to be able to place. See discussion in Mortensen (1950, p. 356). Lambert, J. 1895. Essai d'une monographie du genere Micraster et notes sur quelques échinides. Pp. 149-267. In de GROSSOUVRE, A. (ed.) Recherches sur la Craie supérieure. Mémoires du Service de la Carte géologique de France 1 (Chaptre IV). Mortensen, T. 1950. A monograph of the Echinoidea. V. Spatangoida 1. C. A. Reitzel, Copenhagen.