The Echinoid Directory

Calzadaster Carrasco, 2005

Diagnostic Features	Test ovate in outline with faint anterior sulcus, deppening adorally; flattened above and below with ambitus at about mid-height. Apical portion of test slightly extended. Apical disc ethmolytic with four gonopores; positioned close to anterior margin. Anterior ambulacrum mostly vertical; weakly depressed from ambitus to peristome. Pore-pairs small and uniserial. Petals parallel-sided and more or less straight; sunken. The anterior petals angled at slightly more than 180 degrees and extending to the ambitus. Posterior petals slightly longer and not reaching ambitus. Peristome large and D-shaped; downward-facing. Plastron plating not preserved. Periproct relatively large and towards top of steeply inclined posterior face. Peripetalous and latero-anal fascioles present; the combined fasciole passing inframarginally around the anterior.
Distribution	Eocene (Lutetian), Barcelona, Spain
Name gender	masculine
Type	Calzadaster friasi Carrasco, 2005, by original designation.
Species Included	Only the type species
Classification and/or Status	Irregularia, Spatangoida, Paleopneustina, Schizasteridae. Subjective junior synonym of Aguayoaster Sanchez Roig, 1952.
Remarks	There are only very slight differences in proportion that separate this taxon from the type species of Aguayoaster. Carrasco, J. F. 2005. Calzadaster friasi, un nuevo genero y una nueva especie de Spatangoida (Echinoidea) del Eoceno de Cataluna. Batalleria 12, 49-56.