Reef to Rainforest: Discovering Tropical Species, Places, Nature


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Crinoid or feather star. Janine Cairns-Michael
Opioderma sp. brittlestar. Paul Humann
Fromia sp. sea star or starfish. Janine Cairns-Michael
Tripneustes gratilla, Sea Eggs. Scott W. Michael
Colochirus robustus, Yellow Cucumber.

[edit] The Echinoderms

Feather Stars, Sea Stars, Brittle Stars, Sea Urchins, Sea Cucumbers

Number of Living Species: 6,000.

Common Characteristics: Body has pentamerous radial symmetry (five parts around a central axis); internal skeleton of calcareous ossicles that may be flexible, as in sea stars, or fused into a rigid shell (test), as in sea urchins.

Noteworthy Behaviors: Locomotion achieved with the aid of tiny suckerlike pods that are part of a unique vascular system, a complex network of fluid-filled canals and appendages in the body wall.

[edit] Feather Stars

Class Crinoidea (Crinoids, Feather Stars, Sea Lilies): 550 species

[edit] Starfishes

Class Asteroidea (Sea Stars, Starfish): 1,500 species

[edit] Basket Stars and Brittle Stars

Class Ophiuroidea (Basket Stars, Serpent Stars, Brittle Stars): 2,000 species

[edit] Sea Urchins

Class Echinoidea (Sea Urchins, Heart Urchins, Sand Dollars): 950 species

[edit] Sea Cucumbers

Class Holothuroidea (Sea Cucumbers): 900 species

From: Reef Life by Denise Nielsen Tackett