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Porifera - Sponges (Pore bearer)
- aquatic
- no true tissues
- two layers of cells surround a central gastric cavity lines with flagellated cells that draw water and microscopic food through pores in the body wall
- body supported by spicules and fibers
- may be solitary or colonial
- Asymmetry
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Cnidaria - sea anemones, jellyfish, corals
- Aquatic
- body composed of many varied cells in 2 layers
- radial symmetry
- gastrovascular cavity with single opening to outside
- moth surrounded by tentacles containing stinging cells (nematocysts)
- two body forms - a motile medusa (jellyfish) and attached polyp
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Platyhelminthes - Flatworm
- body flattened dorso - ventrally
- bilateral symmetry
- acoelomoate - lacking a coelom
- gut branched with single opening
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Mollusca - Shellfish
- soft body composed of a heart, visceral mass and foot
- body often covered by shell
- three cell layers with coelom
- bilateral symmetry
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Annelida - segmented worms
- Cylindrical, segmented, elongated body
- bilateral symmetry
- three cell layers with coelom
- bristles composed of chitin typically present
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Anthropoda - joint legged animals
- Segmented, coelomate body
- bilateral symmetry
- chitinous jointed exoskeleton covers entire body
- legs jointed
- bouble, solid, ventral nerve cord
- class: crustacea (crab), diplopoda (millipede), chilopoda (centipede), insecta (fly), arachnida (spider)
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Chordata
- some stage in life:
- Notochord (an internal, solid, stiffening rod)
- Hollow dorsal nerve cord
- paired pharyngeal gill slits
- post anal tail
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SUB PHYLUM OF CHORDATA
Vertebrata
- Notochord partly or wholly replaced by vertebral column in adults
- clearly differentiated head with brain enclosed in cranium
- muscular ventral heart
- class: Agnatha, chondrichthyes, pices, amphibia, reptilia, aves, mammalia
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