Which of the following is NOT characteristic of the Phylum Echinodermata?Įndoskeleton of dermal calcareous ossiclesīlood-vascular system with closed circulationĮchinoderm respiration is accomplished by which of the following?īecause of their sessile nature, echinoderms are often the prey of other animalsincluding other echinoderms! Many zoologists believe that early echinoderms were sessile and evolved radiality as an adaptation to sessile existence.Īttached forms of echinoderms were once plentiful, as documented by the fossil record, but today the only attached forms are in the Class Crinoidea.Ī wide variety of animals make their homes in or on echinoderms, including parasitic or commensal algae, protozoa, ctenophores, turbellarians, cirripedians, copepods, decapods, snails, clams, polychaetes, fish, and amphibians. The biological contributions of the echinoderms include which of the following?Ī water vascular system derived from a coelomic compartmentĪ dermal endoskeleton composed of calcareous ossiclesĪ metamorphosis which changes a bilateral larva to a radial adultĮchinoderms include organisms commonly called starfishes (sea stars), brittle stars, sea urchins, sea lilies, but not sea cucumbers, which belong to the Phylum Annelida. They are not closely related to the Hemichordata or the Chordata They have radial and regulative (indeterminate) cleavage Their anus develops from or near the blastopore whereas the mouth develops from elsewhere Which of the following is NOT correct about echinoderms? Please change your browser preferences to enable javascript, and reload this page.Įchinoderm adults have radial symmetry but their larvae are bilateral. You must have javascript enabled to view this website.
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