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Frequently Asked Questions

• What is echinoderms?

  Echinodermata (echinoderms) Phylum of ‘spiny-skinned’ invertebrate animals which are entirely marine.

• Are echinoderms filter feeders?

  A few echinoderms are sessile filter feeders while others are actively hunting their prey. Though some filter feeder 's food is direct to their mouth Echinodermata circulatory system and nervous system is a basic system that circulates around its body.

• Why are echinoderms radially symmetrical?

  Many echinoderm species have since evolved mobility as radially symmetrical adults. Echinoderms possess a unique water vascular system, which provides structural support for a set of tube feet used for locomotion. This system consists of internal canals lined with protruding tube feet and muscular sacs called ampullae.

• What type of echinoderms are sea cucumbers?

  Echinodermata. The anus is on the aboral surface, opposite the groove. Class Holothuroidea The sea cucumbers are long-bodied echinoderms with the mouth at or near one end and the anus at or near the other. Because of their elongation along the oral-aboral plane, they lie on their sides rather than on the oral surface.

• What are echinoderms in biology?

  Echinoderms are a phylum of marine invertebrates that include starfish, brittle stars, sea cucumbers, sea urchins, sand dollars, and crinoids. They are one of the most diverse groups of marine invertebrates and play important ecological roles from the near-shore environment to the deep seas.

• What are the characteristics of echinoderms in the Paleozoic era?

  The Paleozoic echinoderms were globular, attached to the substrate and were orientated with their oral surfaces upwards. The fossil echinoderms had ambulacral grooves extending down the side of the body, fringed on either side by brachioles, structures very similar to the pinnules of a modern crinoid.

• Are echinoderms bilateral or pentaradial?

  Echinoderms evolved from animals with bilateral symmetry. Although adult echinoderms possess pentaradial, or five-sided, symmetry, echinoderm larvae are ciliated, free-swimming organisms that organize in bilateral symmetry which makes them look like embryonic chordates.

• Why do echinoderms have a 5 sided skeleton?

  Echinoderms are radically symmetrical, and the body is usually divided into five parts or multiples of five. This five-sided radial structure of echinoderms makes the body strong (Fig. 3.86). A five-sided skeleton is stronger than a four- or six-sided one because the line of weakness cannot run directly across the body.