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MONTESSORI ZOOLOGY : Main Characteristics of Echinodermata


Echinoderm means spiny skin. Even though
 echinoderms are called invertebrates,
they do seem to have an internal skeleton 
of calcium plates. They also all have a
five part body, a water vascular system
and structures called tube feet. 

It includes the starfishesbrittle stars,
sea urchins, sea cucumbers and
sea liliesAll are marine in habitat and
radically symmetrical, a skeleton of
calcium carbonate is often present.


 -Pinegreenwoods Montessori
Montessori Zoology