The Echinoid Directory

Rotula Schumacher, 1817, p. 33

[=Echinotrochus Pomel, 1883, p. 72, type species (objective)]

Diagnostic Features
  • Test discoidal; ambitus sharp.
  • Four gonopores in apical disc. Pentagonal with ocular plates at the points.
  • Adapical interambulacra a uniserial series of plates.
  • Petals well developed and open distally.
  • Posterior of test strongly digitate.
  • Food grooves on oral surface well developed; bifurcating immediately after basicoronal circlet.
  • Basicoronal circlet composed of paired ambulacral and paired interambulacral plates (20 in total).
  • Periproct midway between peristome and posterior margin on oral face; opening between second pair of paired interambulacral plates.
  • Internal partitions well-developed around margin; formed of V-shaped bars on either side of radial elements.
?Miocene, Recent; West Africa.
Name gender feminine
Rotula multiloba Schumacher, 1817 (=Echinodiscus deciesdigitatus Leske, 1778) by monotypy.
Species Included
  • Only the type species.
Classification and/or Status

Clypeasteroida; Scutellina; Laganiformes; Rotulidae.



Differs from Rotuloidea and Heliophora in having lunules in the anterior part of the test.

Mortensen, T. 1948. A Monograph of the Echinoidea IV.2 Clypeasteroida. C. A. Reitzel, Copenhagen.

J. W. Durham 1955 Classification of clypeasteroid echinoids. University of California Publications in Geological Sciences 31, 73-191.