Echinoderms are a phylum of exclusively marine deuterostome invertebrates characterized by pentaradial symmetry in adults, a calcareous endoskeleton composed of ossicles, and a unique water vascular ...
Echinoderm research and diversity in Latin America / Juan José Alvarado and Francisco Alonso Solís-Marín -- The echinoderms of Mexico : biodiversity, distribution and current state of knowledge / ...
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