The Echinoid Directory

• Test cordate with anterior sulcus; flat based and depressed in profile with low, sharp ambitus. Posterior truncated.
• Apical disc ethmolytic, with 4 gonopores; subcentral.
• Anterior ambulacrum sunken from apex and deepening towards ambitus; pore-pairs small, undifferentiated.
• Anterior paired petals with pore-pairs in anterior column rudimentary adapically and only small and poorly developed distally.
• Posterior petals bowed, with equally developed columns of conjugate pore-pairs.
• Periproct on short posterior face.
• Peristome wider than long; ovate; downward facing.
• Labral plate narrow and elongate.
• Paired sternal plates triangular and fully tuberculate.
• Numerous coarse tubercles in all but the posterior interambulacrum. Primary tubercles sunken.
• Subanal fasciole present.
• Latero-oral interambulacral tubercles in rows with slightly sunken areoles.

Upper Eocene, Hungary.

Atelospatangus (Semipetalion) anomon Szorenyi, 1963, p. 195, by original designation.

• Only the type species.

Spatangoida, Micrasterina, Loveniidae.

Monotypic.

Distinguished from Nacospatangus by its four gonopores and deep anterior sulcus. Distinguished from Atelospatangus by having small but distinct petal pore-pairs towards the ends of the anterior column of the anterior paired petals.

Szorenyi, von E. 1963. Einiges uber Mitglieder der Familie Spatangidae (Echinoidea). Palaeontologische Zeitschrift, 37, 185-197, pls 14-15.