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15 Cards in this Set
- Front
- Back
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Describe acoelomates
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-No body cavity except digestrive tract
-Region between gut(endoderm) and epidermis filled with mesenchyme and muscle. -Simplest of triploblastic body form |
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What is the purpose of a coelom?
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The coelom protects the reproductive organs and gut and it is used for storage. It is recruited as part of the hydrostatic skeleton and for movement.
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Describe blastocoelomates
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- Persistant blastocoel between gut and body wall
-Can store millions of eggs |
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Describe eucoelomates
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-True coelom= mesodermal cavity
-Often used for movement and hydrostatic skeleton |
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Describe schizocoely
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The formation of the coelom happens by splitting the mesoderm in half
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Describe enterocoely
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The formation of coelom happens by out pocketing of the gut.
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What is a Reynolds Number and how does it affect invertebrates?
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Quantifies the ratio of inertial force to viscous force. Life at low Reynolds numbers is very different from what we experience. Viscous force much stronger and more important.
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What are some examples of locomotion and support?
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-Ameboid locomotion:some larvae, amoebid cells in body
-Cillia & flagella: larval stage of everything but arthropods, comb jellies -Hydrostatic skeleton: earthworms -Rigid skeleton: -Endoskeleton: sponges, invert chordates, starfish -Exoskeleton: arthropods |
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Name some feeding strategies
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-Suspension feeding: trapping particles suspended in fluid
-Deposit feeding: feeding on settled food particulate underneath the sediment |
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Name 3 types of life cycles in invertebrates
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-Indirect development: different stages involving metamorphosis
-Direct Development: no metamorphosis and each stage looks like the others Mixed development- young held inside and released after hatching |
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Describe the parasitic life cycles
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Ectoparasite- living and feeding on outside
Endoparasite- feeding on inside Mesoparasite- living in body cavity |
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What are the 2 theories of the origin of metazoa?
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Syncytial theory and colonial theory
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Describe the phylum porifera
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-pore bearing
-Parazoan (lack true embryological germ layers) - True tissues absent; multicellular but cells totipotent -Sessile, suspension feeders with unique water canals -Assymetrical or +/- radially symmetrical -Unique water-collar cells: choanocytes -Reaggregation |
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What are the type of spicules found in sponges?
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-Calcium carbonate: Class Calcarea
-Silceous & 6-rayed: Class Hexactinellida(Marine only) -If siliceous, not 6-rayed; or made of collagen(spongin): Class desmospongiae |
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What is unique about glass sponges?
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The first light transducers. They allow light to travel down their spicules to bring light to otherwise dark cavities. This provides energy to photosynthetic symbionts.
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