Holectypus
Holectypus, genus of extinct echinoids, animals much like the modern sea urchins and sand dollars, found as fossils exclusively in marine rocks of Jurassic to Cretaceous age (between 200 million and 65.5 million years ago). Holectypus was bun shaped with a flat bottom and arched back.
Citation Information
Article Title:
Holectypus
Website Name:
Encyclopaedia Britannica
Publisher:
Encyclopaedia Britannica, Inc.
Date Published:
28 April 2016
Access Date:
February 23, 2025