Phylum Echinodermata: Sand Dollars, Starfish, and Sea

UrchinsBy: Amanda Brainerd

Endoskeleton Five-part radial symmetry Water-vascular system Skin Gills No head or brain

Key Characteristics

Anatomy

Sieve Ring canal Tube feet Anus Stomach Digestive glands Skin gills Reproductive glands

Simple digestion In through mouth and down esophagus Two-stomach system Intestines Anus

Digestion

Water vascular system Tube Feet Skin Gills Bumps or Spines on surface Hemolymph Circulation

Respiration

Water vascular system Madreporite Ring Canal Water Tube Feet

Internal Transport

Anus Mouth Tube feet and skin gills No real excretion system Diffusion

Excretion

Eyespots Nerves Tube Feet Spiny Skin Statocysts

Response

Tube and thin layers of muscles Tube feet Water vascular system Suckers and arms Spines https://www.youtube.com/watch?v=

cec4YPXBnXk

Movement

Diecious Sexual Reproduction External fertilization Fission and regeneration Larvae settle on ocean floor

Reproduction

Examples

Echinodermata has approximately 7000 described living species and about 13,000 extinct species known from the fossil record.

Brittle Stars can be found at depths as great as 6000 meters.

Sea stars have up to 200 light sensitive eye spots.

Some species can live up to 10 years. Echinoderms are the most complex of

invertebrates.

Facts

http://echinodermsg.blogspot.com/2007/04/digestion.html

http://intro.bio.umb.edu/112s99Lect/bodyplans/starfish.html

http://echinodermsf.blogspot.com/2007/04/internal-transport.html

http://www.mesa.edu.au/echinoderms/ http://www.oceaninn.com/the-nature-preserve/echino

derms/

Words Cited