Bothriocidaris

Bothriocidaris is an extinct genus of echinoid from the Ordovician. It grew to 1.6 centimetres (0.63 in) in size and fed on plankton.

Bothriocidaris Temporal range:
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Echinoidea
Order:	Bothriocidaroida
Family:	Bothriocidaridae
Genus:	Bothriocidaris Eichwald, 1860

Bothriocidaris globulus. from the Encyclopædia Britannica, 1911. The short spines which were attached to the tubercles are not drawn.

References

• Dinosaurs to Dodos: An Encyclopedia of Extinct Animals by Don Lessem and Jan Sovak
• Parker, Steve. Dinosaurus: the complete guide to dinosaurs. Firefly Books Inc, 2003. Pg. 55

Kolata, Dennis; Strimple, Harrell; Levorson, Calvin (1977-01-01). "A New Species of Bothriocidaris (Echinoidea) from the Cincinnatian Maquoketa Group of Iowa". Proceedings of the Iowa Academy of Science. 84 (4): 146–149. ISSN 0085-2236.