Phylum Echinodermata
Phylum Echinodermata
Phylum Echinodermata
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Crinoidea (major groups and relationships)<br />
= Aethocrinea<br />
1 development of true arms with extension of the ambulacra<br />
2 loss of the basal circlet<br />
3 loss of the lintel circlet<br />
4 fixed brachials and fixed interradials incorporated into the calyx<br />
5 with the mouth exposed on the tegmen and loose plate sutures<br />
6 loss of the anal plate and an entoneural system enclosed within the calyx plates<br />
<strong>Echinodermata</strong> – classification – Pelmatozoa – Crinoidea<br />
Early Ordovician to Permian<br />
Ordovician<br />
since Triassic<br />
Early Ordovician to Permian<br />
Middle Ordovician to Permian<br />
Early Ordovician to Permian
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