Term
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Definition
| Bristles that project out from the epidermis to provide traction and other capibilities |
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Term
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Definition
| "many" Polychaetes have parapodia on every body segment |
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Term
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Definition
| "few"- Oligochaetes lack parapodia |
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Term
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Definition
| Their bodies are composed of serially repeated units |
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Term
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Definition
| Walls that separate segments |
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Term
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Definition
| Circular grooves that mark body segments (ring-like constrictions) |
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Term
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Definition
| Region anterior to the mouth |
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Term
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Definition
| Second body segment in an annelid body (directly behind the prostomium) |
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Term
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Definition
| Terminal portion of annelid body bearing the anus |
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Term
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Definition
| Wave-like movement patterns that act to propel an animal forward |
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Term
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Definition
| Cells that replace lost setae by developing new ones |
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Term
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Definition
| Organisms that obtain nutrients by consuming decomposing plant and animal parts |
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Term
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Definition
| How earthworms move: contractions of circular muscles in the anterior end lengthen the body, where it is anchored by setae; then longitudinal muscles shorten the body, pulling the posterior end forward |
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Term
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Definition
| mesodermal epithelium that lines the body wall, forming dorsal and ventral mesentaries |
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Term
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Definition
| Paired lateral projections on each side of most segments in polychaetes (modified for movement, respiration, or feeding) |
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Term
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Definition
| Thickened, saddle-like portion of certain midbody segments of many oligochaetes and leeches. Produces the cocoon in which eggs are deposited during sexual reproduction |
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Term
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Definition
| Glands in an earthworm's esophagus that secrete calcium ions into the gut (reduces the calcium ion concentration of their blood) |
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Term
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Definition
| Cells released into the coelom where they float freely as eleocytes |
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Term
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Definition
| Transport materials to the body tissues |
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Term
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Definition
| Longitudinal fold projecting into the intestine that greatly increases the absorptive and digestive surface |
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Term
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Definition
| Connective tissue and spaces; lacunae channels may serve as an auxiliary circulatory system |
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Term
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Definition
| Subdivision of body segments |
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Term
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Definition
| Muscular part of digestive system that grinds food into small pieces (posterior to crop) |
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Term
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Definition
| Thin-walled region of esophagus specialized for storing food |
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