Echinoidea Sea Urchin





Echinoidea has a round shape. its body surface has spines like the spines of a porcupine. Some of those spines are short and dull and some are also long and sharp. Short ambulacral legs are found between the long spines.


Example :
(1). Sea urchins (Echinus)
(2). Sand dollar (Echinodiscur)

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