Fossil Crinoidea

Crinoidea

Asteroidea

Holothuroidea

Ophiuroidea

Welcome to Assembling the Echinoderm Tree of Life

The tree of life is incomplete without inclusion of the diverse marine animal phylum Echinodermata. The Echinodermata includes familiar organisms such as starfish and sea urchins as well as a wide array of extinct forms stretching back to the Cambrian Period.