Prehistroic Models: Echinodermata

Echinodermata means “spiny or hedgehog skin” consist of sea stars, sea urchins, sand dollars, sea cucumbers, and crinoids “sea lillyies”. Most animals have bilateral symmetry, adults echinoderms have pentameral (five-point) symmetry. The earliest members of this group appears during the Cambrian Perion over 500 million years ago.

Domain: Eukarya – Kingdom: Animalia – Phylum: Echinodermata – Superclass: Asterozoa – Class: Asteroidea

(sea  stars formally “starfish”)

Triassic to Present

Sea Star

Sea Star

Sea Star

Sea Star

Sea Star

Domain: Eukarya – Kingdom: Animalia – Phylum: Echinodermata – Subphylum: Echinozoa – Class: Holothuroidea

(sea cucumber)

Ordovician to Present

Sea Cucumber

The video below is from my YouTube Jurassic James 65:

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