What invertebrates have endoskeletons?

1 Answer
Jun 19, 2018

If we consider prominent invertebrate animal phyla, the answer will be Porifera and Echinodermata.


Sponges included under Phylum Porifera possess endoskeletal elements in the form of mineralised spicules and organic spongin fibre. Spicules are made of calcium compunds and/or silica. In fact, Poriferans are classified on the basis of their endoskeleton.

In members of Phylum Echinodermata , endoskeleton is made up of calcareous dermal ossicles of various shape and size. Such ossicles also show spines and bumps, all covered by a very thin layer of skin.