Coelopleurus wetherelli is one of the only species of echinoid which can be found in the London Clay. It is quite rare.
Below is an example of Coelopleutus wetherelli
Kingdom: Animalia
Phylum: Echinodermata
Subphylum: Echinozoa
Class: Echinoidea
Subclass: Euechinoidea
Infraclass: Carinacea
Subterclass: Echinacea
Order: Arbacioida
Family: Arbaciidae
Genus: Coelopleurus (Cloest living relative)
Species: Coelopleurus wetherelli
Image from James Black
The genus Coelopleurus is still alive today and are known as abyssal sea urchins and are often brightly colored.
On the left is an example of a living member of the Coelopleurus genus.
Acknowledgments:
Thank you very much James Black for allowing usage of the images on this page.
References:
https://www.marinespecies.org/aphia.php?p=taxdetails&id=1033610