Echinoderms and Arthropods Echinoderms (spiny skinned) starfish, urchins, sea cucumbers and sand dollars -Radially symmetrical called Pentamerous radial symmetry -no head, no dorsal or ventral side -complete digestive tract - endoskeleton -can have spines or bumps -Water Vascular system -tube feet for movement -Madreporite, small dot that connects vascular system Sea Stars Asteroides Mouth - anus Aboral and oral
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Echinoderms and Arthropods
Echinoderms (spiny skinned) starfish, urchins, sea cucumbers and sand dollars
-Radially symmetrical called Pentamerous radial symmetry -no head, no dorsal or ventral side
-complete digestive tract - endoskeleton
-can have spines or bumps -Water Vascular system -tube feet for movement
-Madreporite, small dot that connects vascular system
Sea Stars Asteroides
Mouth - anus
Aboral and oral
Brittle Stars Ophiuroidea
Very long and flexible arms
Quick movements
No anus
Sea Urchins Echinoidea
Round skeleton (Test)
moveable spines tube feet for movement
Aristotle’s Lantern
Sea Cucumbers Holothuroidea
Like big slugs Don’t move much but
move by tube feet Mouth - anus Evisceration
Arthropods Crustaceans
Barnacles, copepods, isopods, krill Shrimp, Lobsters and Crabs