The Echinoid Directory

• Test small (lectotype 14.3 mm) elongate, ovate, with a pointed posterior margin. Greatest width posterior of centre, low posteriorly, inflated anteriorly, with a flat adoral surface, slightly sunken towards the peristome.
• Apical disc monobasal, with 4 gonopores.
• Petals broad, unequal, petal III short, half the length of the lateral petals, between one third and half of the length of the posterior petals. Pores conjugate, ambulacral plates beyond petals with single pores.
• Peristome anterior, circular.
• Periproct inframarginal, round.
• Bourrelets undeveloped.
• Phyllodes slightly developed single pored, with slight crowding of pores near the peristome.
• Buccal pores present.

• Upper Cretaceous (Maastrichtian) to Danian of Morocco.

Termieria henrici Lambert, 1931, p. 31; by original designation.

• Only the type species.

Irregularia; Neognathostomata; Plesiolampadidae.

Monotypic.

Kier (1962, p. 197) remarks that the only two specimens known of the type species may in fact be immature, and therefore characters considered to be generic may not occur in mature specimens. Kier (1962) states that in a larger specimen, although the difference in the number of pore pairs would remain the same, the proportional difference between the pore pairs and between the length of the petals would change. This is true, however, petal III would still be reduced in length relative to the other petals. Other characters such as the shape of the peristome and periproct are unlikely to significantly alter with an increase in size.

Somewhat similar to Gentillia, differing in having much simpler phyllodes composed of a sngle irregular series of pores rather than distinct inner and outer columns. Also the pores in ambulacrum III are uniserial rather than biserially arranged.

P. M. Kier. 1962. Revision of the cassiduloid echinoids. Smithsonian Miscellaneous Collections 144, (3), 262 pp.