Phylum Echinodermata
Phylum Echinodermata
Phylum Echinodermata
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
“Regularia and Irregularia”<br />
represent no phylogentic groups, still used as a convenient, informal classification<br />
Regularia: strict pentamere symmetry<br />
upper surface (aboral) with central apical disc bearing periproct with anus<br />
long spines for protection<br />
epibenthic grazers<br />
paraphyletic group<br />
Irregularia: pentamere symmetry with superimposed bilateral symmetry<br />
mouth located more anterior<br />
anus at posterior end<br />
test covered with a mat of short spines<br />
infaunal depost feeders<br />
most probably monophyletic<br />
<strong>Echinodermata</strong> – classification – Eleutherozoa – Echinozoa - Echinoidea
Change language