List 5 things you have learned about arthropods. Complete sentences!! Bellringer List 5 things you have learned about arthropods. Complete sentences!!

Sea stars, brittle stars, sea cucumbers, sand dollars, sea urchins…. Phylum Echinodermata “Spiny Skin” Sea stars, brittle stars, sea cucumbers, sand dollars, sea urchins….

General Characteristics Adult—radial symmetry, larva—bilateral symmetry Sexual reproduction and regeneration Each arm has a digestive, reproductive, and nervous system (allows for regeneration) Endoskeleton

Water vascular system Allows them to eat, move, and exchange gases through hydraulics Works by way of tubes (tube foot—hollow tube w/a suction cup end) Water enters an opening on the dorsal side…sieve plate Goes into the ring canal and radial canal in each arm

A muscular sac (Ampulla) helps to force water into the tube foot and then they lift Like using a plunger