Overview

Brief Summary

Fossil species

recent & fossil

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Evolution and Systematics

Evolution

Classification

Although represented here as sister groups, Acroechinoidea, Carinacea and Irregularia actually form a set of nested clades (see image below). Due to the limitations of WoRMS this cannot be reflected in the database at present.
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© WoRMS for SMEBD

Source: World Register of Marine Species

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