Definitionn. marine invertebrates with tube feet and five-part radially symmetrical bodies
Last update: September 25, 2015
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Mucronalia, foot reduced, but still operculate, eyes present, animal fixed by its very long proboscis which is deeply buried in the tissues of an Echinoderm, no pseudopallium. [Please select]
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This blastema then begins to change, and gradually assumes the form of the perfect Echinoderm. [Please select]
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He considers the Rotifers to be "the permanent forms of Echinoderm larvæ." [Please select]
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”[29] Müller considered that the mouth and pharynx of the larva were either absorbed or cast off with the calcareous rods, but were never converted into the corresponding organs of the perfect Echinoderm. [Please select]
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”[36] Even in the same species of Echinoderm the degree of development attained by the larva differs to a certain extent according to the temperature, the supply of food, &c. [Please select]
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