The Echinoid Directory

Contributed by Jenna Sullivan, May 2007

Echinolampas discoideus d'Archiac and Haime, 1853, p. 209

Diagnostic Features "Test subcircular, a little longer than broad; no angular tuberoisities on sides. Margin rounded. Slight projection above the anus. Apical summit slightly projecting at the anterior two fifths of the great diameter. Four genital pores rather small. Madreporite separates the postero-lateral radials (ocular plates). The posterior poriferous zone of the antero-lateral ambulacra is sinuous or slightly doubly curved, being moreover longer than the anterior zone. Ambulacra tend to close. The posterior ambulacra are widely open. Greater tumidity of the test behind the apex than over the region of the anterior ambulacrum, where there is some flattening. Periproct inframarginal, small, and tolerably regularly elliptical in shape." (Duncan and Sladen, 1884, p. 261)
Distribution Oligocene, Nari Series, of Sind, Pakistan; Oligocene of Central Africa near Lake Nyasa.
Type Syntypes: Natural History Museum E78560, E78561.
Classification and/or Status Species of Echinolampas.
Remarks Similar to Echionlampas ovalis, but E. discoideus is more elongate and has more elevated ambulacra. (d'Archiac and Haime, 1853, p. 210)

Archiac, E. J. A. D. de St. S., le Vicompte d' and Haime, J. 1853. Description des Animaux Fossiles du Groupe Nummulitique de l'Inde, Paris, : 209, pl. 14, fig. 3a, b.

Duncan, P. M. and Sladen, W. P. 1884. Tertiary and Upper Cretaceous Fossils of Western Sind. 4. The fossil Echinoidea from the Nari Series, the Oligocene Formation of western Sind. Palaeontologica Indica, 14th series 1 (3)