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Everything I need to know about Echinoderms

How many tissue layers do echinoderms have? Triploblastic
Are echinoderms segmented or unsegmented? Segmented
How does the mesoderm line the echinoderms body wall? Eucleomate
What type of body symmetry do echinoderms have? Secondary pentamerous radial symmetry.* Bilateral as larvae radial as adults.
What is the structure of an echinoderms skeleton? * endoskeleton with spines through skin. Plates of calcium carbonate.
What type of vascular system do echinoderms have? * water vascular system
What is Echinoderm Taxonomy based on? Deviations from ancestral body plan
What is the most primitive class of echinoderms? Crinodia- sea lily's and feather stars with tube feet and spines prominent arms
Class ophiudroia Basket stars and brittle stars- mouth on the underside of body disk. Prominent arms
Class Asteroida Starfish Prominent arms
What is the class with deviations from the ancestral body plan without arms called? Concentracycloida- Sea Dasies
What is the structure of the echinoderms digestive system? 2 ring canals. Some have an incomplete digestive system.
Sand Dollar Has shortest oral to aboral surface
Sea Biscut Mid length oral to aboral surface
Sea urchen Long oral to aboral surface
Created by: 100003332070938