Phylum Echinodermata
Phylum Echinodermata
Phylum Echinodermata
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<strong>Echinodermata</strong> – classification – Eleutherozoa – Echinozoa – Echinoidea – sand dollars<br />
5 interambulacral columns<br />
5 ambulacral columns<br />
Adapical portion of ambulacra<br />
developed int petals<br />
Spines are short and stubby<br />
5 food grooves radiating<br />
from peristome<br />
Often with elongated<br />
perforations (lunules)<br />
Have a lantern and perignathic<br />
Girdle, which, however, can be<br />
resorbed in adult stages
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