About Echinoderms!!

There are about 7,000 living species of echinoderms. It is the second largest group of deuterostomes. They are the largest phylum without species living in fresh water or terrestrial. Thier skeletons are major contributors to a lot of limestone formations. Echinoderms are responsible for the Mesozoic revolution of marine life. Echinoderms have sharp spines.

Sand Dollar

The animal we chose to research further for Enchinoderms is the sand dollar. Sand dollars reproduce sexually. A unique mating behavior they have is that they release gametes to attract females. Sand dollars are omnivores. They feed on small crabs, small worms, and algae. Sand dollars live below sand or muddy water, but they need to be shallow. Thier habitats are sandy muddy areas. They adapted to survive by clone themselves with thier larvae as a mechanism of defense.

Vertebrate or Invertebrate

Echinoderms are invertebrates.

Warm-blooded or Cold-blooded

Echinoderms are cold-blooded.

Type of Symmetry

Echinoderms have bilateral symmetry.