Polychaeta
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Created by:
zoobots2011 on April 13, 2011
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Megan Dethier's Marine Invertebrate Zoology
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16 terms
Terms | Definitions |
|---|---|
 Polychaete | Class of Annelida |
| Polychaete ecology | marine; diverse habitats from pelagic to burrowing |
| Polychaetae morphology | diverse from earthworm like simple bodies to elaborate spaghetti worms |
| Polychaete key distinguishing characteristic | parapodia with many setae |
| Polychaete epidermic | can secrete mucus, tubes, glue, bioluminescent chemicals |
| Polychaete gas exchange system | gills or parapodia |
| Polychaete gas exchange molecules | hemoglobin; erthyroglobin; chlorocruorin (green) |
| Polychaete giant axons | some of largest axons in nature; allow fast escape responses |
| Polychaete families to know | Arenicolidae - lug worms Nereididae - clam worms Sabellidae - fan worms with flexible tubes Serpulidae - fan worms with calcareous tubes Glyceridae - drop-me worms Lumbrineridae - blood worms Polynoidae - scale worms Terebellidae - spaghetti worms |
| Polychaete movement | Very complex, large muscle bands, each segment has separate coelom & nerves; can move independently |
| Polychaete heads (prostomium) | well developed; many sensory structures or other concentrations of nervous system; adapted to natural history of worm (simple in burrowers, complex in predators) |
| Worms with large axons | Sabellid |
| Polychaete excretion/osmoregulation | Nephridia, variety of types - often pair of ciliated funnels in each segment that open into coelom and end in pore to outside |
| Polychaete reproduction | Dioecious; peritoneum produces eggs or sperm; gametes can go out through nnephridiuam (mixonephridium) or a separate similar ciliated funnel (gonoduct); some have special spawing forms called epitokes |
| Polychaete larva | Trochophore; spiral cleavage; determinant development |
| Determinant development | Fate of cells is determined by four cell stage of development |
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