Sea urchins, or echinoids, are a group of marine animals, ... Over 200 complete fossil echinoids are preserved in exquisite detail on a limestone surface, in an area of just 1m 2.

Echinoids are a major group of marine invertebrates with a long fossil record. If you know nothing about the group the obvious place to start is at the Introduction. Here you will find some basic ...

THE Echinoidea afford probably greater opportunities for accurate phylogenetic study than any other class of animals. This is due to the fact that a fossil Echinoid is, when well preserved, often ...

Fossil spines of irregular echinoids (sea urchins) indicate their long-standing existence since the Cretaceous period, as well as their evolution under the influence of fluctuating environmental ...

The researchers integrated their genetic findings with fossil-based dating, in order to map the evolutionary history of the echinoids over time as accurately as possible.

ON Feb. 13 we took a single specimen of the Spatangoid Urechinus naresianus in a bucket-sample at 110 metres, seven miles south of Sanda, off the Mull of Kintyre. It was a young individual only, 5 ...