BOW Invertebrates

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Pick 3 invertebrates Compare them in terms of physical features and systems. Identify at least 3 similarities and 3 differences Include pictures and References

Starfish
-Echinoderms that belong to the class Asteroidea.
-Internal anatomy deals with a circulatory system(hemal system), digestive system, nervous system, water vascular system(locomotion), endoskeleton, respiration(coccurs through the tube feet and through papillae) and excretion.
-Bilateral symmetry as larval forms.
-5 rays or arms from it's central disk
-Capable of asexual and sexual reproduction.
-Dioecious(male and female)
-found in ocean

Jellyfish
-Transparent or transluscent.
-classes: Scyphozoa, Staurozoa, Cubozoa, Hydrozoa.
-found in ocean
-Most jellyfish do not have specialized digestive, osmoregulatory, central nervous, respiratory, or circulatory systems.
-Gastrovascular cavity where digestion takes place.
-Do not need a respiratory system because skin is thin enough that body is oxygenated by diffusion.
-hydrostatic skeleton.
-Don;t have a nervous system but have a nerve net located in the epidermis.
-Have ocelli for vision.
-Able to reproduce sexually and asexually.
-nematocysts

Coral
-Class: Anthozoa
-found in ocean.
-major contributors to coral reefs.
-require sunlight and grow in clear, shallow water.
-Can have porous skeletons or solid skeletons.
-Gastrovascular canals allowing the absorption of nutrients
-Exoskeleton
-Tentacles(nematocysts)
-Reproduce sexually or asexually.


sources:
http://en.wikipedia.org/wiki/Coral#Anatomy
http://en.wikipedia.org/wiki/Jellyfish#Anatomy
http://en.wikipedia.org/wiki/Starfish#Internal_anatomy