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24 Cards in this Set
- Front
- Back
General characteristics of animals |
Multicellular Hetero trophy Internal digestion Motility |
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Common ancestor |
Colonial flaggelated protist |
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Formation of colonies occurred because... |
Colonies are more efficient at prey capture |
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Diploblastic |
Animals have two cell layers ectoderm and endoderm |
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Triploblastic |
Animals have three cell layers ectoderm endoderm and mesoderm |
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Gastrulation |
Embryo is a hollow ball of cells that indent to form a cavity called the blastopore |
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Protostomes blastospore... |
Blastopore develops into the mouth |
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Deuterostomes blastopore... |
Blastopore develops into the anus and the mouth develops later |
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Cephalization |
Concentration of sensory organs and nerve tissues at anterior, the head |
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Acoelomate |
Does not have fluid filled body cavity |
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Pseudocoelomate |
Body cavity is a fluid-filled space where internal organs are suspended |
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Coelomate |
Body cavity is a coelom that develops in the mesoderm |
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Peritoneum |
Lines the coelom surrounds the internal organs |
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Hydrostatic |
When muscles contract fluid is pushed to another part of the cavity like snails |
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Segmentation |
Facilitates specialization of body regions and controls movements precisely |
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Bilateria |
Monophyletic group that includes protostomes and deuterostomes |
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Animals in the eumetazoan have... |
Body symmetry, a gut and nervous system, and tissues organized into distinct organs |
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Cnetophores |
Diploblastic with an extracellular matrix called mesoglea between the two layers, Complete gut |
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Placozoans |
a symmetrical and diploblastic |
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Cnidarians |
Gastrovascular cavity functions as a hydrostatic skeleton Radial symmetry Ex: jellyfishes |
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Three clades of the cnidarians |
Anthozoans (corals) Scyphozoans (jellyfish) Hydrozoans (hydras) |
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3 groups of Diploblastic animals |
Cnetophores Placozoans Cnidarians |
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Protostomes are classified by 3 groups... |
Arrow worms Lophotrochozoans Ecdysozoans |
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Deuterostomes are split into 3 groups... |
Echinoderms, hemichordates, chordates |