The Echinoid Directory

Rotuloidea Etheridge, 1872, p. 98

Diagnostic Features	Test discoidal; ambitus relatively thick and rounded. Posterior margin scalloped. Four gonopores in apical disc. Pentagonal with points perradial. Adapical interambulacral plates forming a uniserial series. Petals well developed and open distally. Food grooves on oral surface bifurcating close to peristome. Not forming sunken channels but simply tracks of dense pores. Basicoronal circlet composed externally of 10 paired ambulacral and 10 paired interambulacral plates. Periproct midway between peristome and posterior margin on oral face; opening between second and third pair of interambulacral plates. Internal partitions of radial elements, slightly branched.
Distribution	Pliocene; Morocco.
Name gender	feminine
Type	Rotuloidea fimbriata Etheridge, 1872, by monotypy.
Species Included	Only the type species.
Classification and/or Status	Clypeasteroida; Scutellina; Laganiformes; Rotulidae. Monotypic.
Remarks	Differs from Rotula and Heliophora in lacking finger-like projections around the rear part of the test. Etheridge, R. 1872. Quarterly Journal of the Geological Society 28, p. 97 Mortensen, T. 1948. A Monograph of the Echinoidea IV.2 Clypeasteroida. C. A. Reitzel, Copenhagen.