Term
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Definition
molis- "soft"
-100,000 extant spp
-35,000 extinct spp
Cambrian |
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Term
| 4 Mollusca Characteristics |
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Definition
1. muscular foot -creeping
2. shell (calcified)
3. visceral (gonad + gut = body) mass
4. radula - feeding organ (scraping) |
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Term
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Definition
1. Aplacophora- no shell bearers
2. Polyplacophora- many shell (chitons)
3. Monoplacophora- single shell
4. Gastropoda- stomach & foot (snails & slugs)
5. Bivalvia- hatchet (Pelecypoda, clams, etc)
6. Cephalopoda- head (squids, cuttles, etc)
7. Scaphopoda- spade (tusk) |
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Term
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Definition
Hypothetical ancestral mollusc -simple body plan
[image] |
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Term
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Definition
tooth bearer
-radula sits ontop (radula is made of chitinous membrane w/ teeth) |
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Term
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Definition
| final absorption into body or storage |
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Term
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Definition
made of chitinous membrane with teeth
-highly retractable
-series of teeth like cats tongue |
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Term
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Definition
-pump (heart)
-vessels
-blood (not always contained in vessels
1 Ventricle & 2 Atrium for primitive system |
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Term
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Definition
| blood + interstitial fluid |
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Term
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Definition
| ventricle-aorta-blood vessels-blood sinuses-vessels-gills-atrium-BACK |
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Term
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Definition
molluscan gill -ctenos (comb)
Bipectinate or Monopectinate (only left)
[image] |
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Term
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Definition
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Term
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Definition
| takes blood AWAY from gill |
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Term
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Definition
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Term
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Definition
Around the heart & made of coelom
-formed by schizocoely |
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Term
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Definition
kidney
-a pair
-drain the pericardium & vent into mantle cavity |
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Term
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Definition
1. Protonephridia- blind tubule
2. Metanephridia- ciliated funnel |
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Term
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Definition
4 nerve cords
2 visceral
2 pedal
-Join at the esophagus in a nerve ring |
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Term
| Circumpharyngeal Nerve Ring (CPNR) |
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Definition
| A ring of nerves and ganglia (the brain) that form a circular structure surrounding the pharynx |
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Term
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Definition
1. Dioecious - gonochoristic (separate sexes)
2. Monoecius- hermaphroditic
Primitively= free spawning, external fertilization
Derived= internal fertilization, embryo retention |
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Term
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Definition
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Term
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Definition
cavity filled with hemolymph
(visceral & pedal) |
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Term
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Definition
| use of non-compressible fluid as a skeletal element |
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