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Triploblastic
germ layer of embryonic tissue that includes an endoderm, mesoderm, and ectoderm
→ associated with complexity and additional body cavity
Diploblast
germ layers of embryonic tissue with only an Endoderm and Ectoderm, may have a middle non living layer
Porifera
phylum of sponges
→ marine and freshwater
→ 9,000 described species
possess:
→ multicellularity
→ embryonic layering
→ actin-myosin contractile elements
→ collagen
silicon dioxide, carbonate
spicules that make up a sponges skeleton are composed of
Calcaera
calcaerous sponges with calcium carbonate spicule skeleton
Hexaactinellida
class of Glass sponges whose skeleton is made up of siliceous spicules
demospongiae
class of sponges with siliceous spicules OR organic skeleton, sometimes calcium carbonate
heteroscelromorpha
class of sponges where skeleton in mostly absent, or composed of very small silieceous spicules
Note 
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