See also:

• Science: Biology: Flora and Fauna: Animalia: Echinodermata  (80)
• Science: Biology: Zoology: Echinodermata  (4)

• Archaeocidaris urii - Image of fossilised spines of this echinoid from the Early Carboniferous, found in Cumbria, UK.
• Clypeus plotii - Photograph of a fine specimen of this irregular echinoid from the Middle Jurassic.
• Discovering Fossils: What is an Echinoid? - Provides photographs and information on echinoids, or sea urchins, the arrival of regular species in the fossil record in the Cambrian and the appearance of irregular ones in the Jurassic.
• Hemicidaris mantochensis - Several photographs of fossilised tests of this echinoid, found at Portlandian, France.
• Holectypus hemisphaericus - Images of this echinoid from the Middle Jurassic, found at Beaminster, UK.
• Jurassic Echinoids - Photographs of several fine specimens found in the UK.
• Micraster coranguinum - Photographs of this irregular echinoid from the Late Cretaceous, found in Croydon, UK.
• Peer's Echinoid Pages - Information about and images of echinoids from the Cretaceous Period (Maastrichtian) from the Netherlands.
• 9th International Echinoderm Conference - Links to abstracts.