Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Phylum Echinodermata Echinoderms =“Spiny skinned” General Characteristics Examples: sea stars, sea urchins, sand dollars, and sea cucumbers Can regenerate limbs if part of central disk attached. Organ system •Pentaradial Symmetry (adults) •Body parts arranged into groups of 5 around a central axis •Bilateral Symmetry (larva) Water Vascular System • Network of water filled canals • Water is pushed in and out of the system enabling the echinoderm to move • locomotion, attachment, one part sensory system, gas exchange, Water Vascular System con’t • • Path of the water: Madreporite Stone Canal Ring Canal Radial Canal Ampulla Tube Feet • Ampulla: muscular bulblike sac connects to tube feet Asterias dissection 1 Oral surface Aboral surface Return to axonomy Asterias dissection 2 Aboral surface removed. Asterias dissection 3 Aboral surface removed. Asterias dissection 4 Aboral surface, stomachs and some pyloric caeca removed Asterias dissection 5 Aboral surface, stomachs and some pyloric caeca removed Urchins Feed on algae, corals, dead animal remains Aristotle’s Lantern: complex jaw-like mechanism that is used to grind their food (found in urchins) Sea Cucumbers How they feed: tentacles around the mouth sweep up sediment from the water Sea Cucumbers Defense: Evisceration: Eject internal organs through the anus The organs contain toxins that immobilize prey