Animal Survey - 5. Body cavity- space between outer body...

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Animal Survey- Systematics A. Classification criteria 1. Animals- Eukaryotic, multicellular, ingestive heterotrophs 2. Tissues (do they have them or not?)- group of cells that function for a specific purpose a. Parazoa- don’t have tissues - Phylum Porifera- only animals without tissue b. Eumetazoa- all other animals, they have tissue c. Protista Parazoa Eumetazoa 3. Body symmetry a. radial symmetry- body parts are arranged regularly around central axis - Cnidarians- jelly fish, Hydra - Ctenophores- comb jellies b. Bilateral symmetry- “two sides,” two similar sides c. Radiata and Bilateria are branches
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4. Germ Layers a. embryonic germ layers (tissues) - ectoderm- outermost layer, develops into epidermis (skin) & nervous system - mesoderm- middle layer, develops into our muscles, bones, circulatory system, etc… - endoderm- innermost layer, develops into digestive system (1) diploblastic -the organism has only two layers (Cnidarians, Ctenophores) (2) triploblastic- organism has all three layers
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Unformatted text preview: 5. Body cavity- space between outer body wall and digestive tube a. acoelomate- no body cavity b. pseudocoelomate- false cavity, a body cavity that forms in between the mesoderm and endoderm- Rotifera- wheel animals, have cilia on top of head- Nematoda- round worms c. coelomate- true body cavity, body cavity within mesoderm 6. Embryonic development a. protostomes- first the mouth, blastophore becomes mouth- Platyhelminthes- Nemertea- Mollusca- Annelida- Nematoda- Rotifera- Onychophora- Arthropods b. deuterostomes- second the mouth, blastophore develops into the anus.- Echinoderms- starfish, etc- Chordates- fish, etc B. Major Groups 1. Parazoa- Porifera 2. Eumetazoa a. Radiata- Ctenophora, Cnidaria b. Bilateria- Acoelomates- Platyhelminthes- Pseudocoelomates- Rotifera, Nematoda- Coelomates (1) Protostome- Nemertea, Mollusca, Annelid, Arthropoda, Platyhelminthes, Rotifera, Nematoda (2) Deuterostomes- Echinodermata, Chordata...
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Animal Survey - 5. Body cavity- space between outer body...

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