Morphology of echinoids

Question

15 Apr 2024

Answer :

Word Count : 293

The morphology of echinoids, commonly known as sea urchins, is fascinating and diverse, reflecting their adaptation to various marine environments. Echinoids belong to the phylum Echinodermata, characterized by a pentaradial symmetry and a calcareous endoskeleton composed of ossicles or plates. Here's an overview of their key anatomical features:

1. Test: The body of a typical echinoid is enclosed within a hard, calcareous shell called the test. This test is often spherical or disc-shaped _______ _______ _______ _____ _______ ____ _____ ________.
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