Everything I need to know about Echinoderms
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| How many tissue layers do echinoderms have? | Triploblastic
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| Are echinoderms segmented or unsegmented? | Segmented
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| How does the mesoderm line the echinoderms body wall? | Eucleomate
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| What type of body symmetry do echinoderms have? | Secondary pentamerous radial symmetry.* Bilateral as larvae radial as adults.
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| What is the structure of an echinoderms skeleton? | * endoskeleton with spines through skin. Plates of calcium carbonate.
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| What type of vascular system do echinoderms have? | * water vascular system
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| What is Echinoderm Taxonomy based on? | Deviations from ancestral body plan
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| What is the most primitive class of echinoderms? | Crinodia- sea lily's and feather stars with tube feet and spines
prominent arms
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| Class ophiudroia | Basket stars and brittle stars- mouth on the underside of body disk. Prominent arms
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| Class Asteroida | Starfish
Prominent arms
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| What is the class with deviations from the ancestral body plan without arms called? | Concentracycloida- Sea Dasies
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| What is the structure of the echinoderms digestive system? | 2 ring canals. Some have an incomplete digestive system.
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| Sand Dollar | Has shortest oral to aboral surface
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| Sea Biscut | Mid length oral to aboral surface
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| Sea urchen | Long oral to aboral surface
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