IMPORTANT DISTINGUISHING CHARACTERISTICS
Types of symmetry:
Asymmetric: Having no balance or symmetry
Tubular Sponges
Radial: Radiating from or converging to a common center
Sea Spike
Bilateral: where there is a similarity of parts on the right and left sides of the body
Ant
Body Types:
Acoelomate: without a hollow, true body cavity, or coelom
Gnathostimulida
Pseudocoelomate: a group of invertebrates with a three-layered body that has a fluid-filled body cavity (pseudocoelom) between the endoderm and the mesoderm (the innermost and middle tissue layers)
Planaria
Coelomate: Describes an organism with a coelom, or fluid-filled internal body cavity that is completely lined with mesoderm
Cross Section of a Coelmate
Blastopore Developement:
Protostome: the blastopore develops into the mouth and not the anus
Protostome Mollusks
Deuterostome: the blastopore turns into the anus and not the mouth
Star Fish
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