Term
| What level of organization do cnidarians have? |
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Definition
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| What type of symmetry do cnidaria and ctenophora have? |
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Definition
| radial or biradial symmetry |
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Definition
| cell that contain stinging organelles called nematocysts |
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Term
| What are the two life stages of a cnidarian? |
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Definition
| polyp (sessile) or medusa (jelly-fish) |
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Term
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Definition
| gelatinous substance between the epidermal and gastrodermal tissue layers |
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Definition
| stinging and toxic, they are discharged from the cell |
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Term
| Spirocytes and ptychocytes |
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Definition
| special type of cnidocyte that heps in feeding |
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Definition
| an extended mouth edge used in capturing and ingesting prey |
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Term
| Describe the nerve net in cnidarians |
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Definition
2 nerve nets, one at the base of the epidermis and one at the base of the gastrodermis --> they interconnect
Nerve impulses move across synapses in either direction by NTs
They don't have a CNS but medusae forms have ring nerves that serve as marginal sense organs |
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Definition
| nerves have junctions with epitheliomuscular cells and nematocysts |
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Definition
| feeding polyps with terminal mouth and a circle of tentacles that feed the entire hydroid colony |
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Definition
| sense organs found on indentations on the margin of the bell of a scyphozoan |
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Definition
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Definition
found in sea anemones
- a slit-shaped mouth that leads into the pharynx, it is a ciliated groove |
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Definition
| gastrodermal tubes through which gastrovascular vacities communicate in octocorralia |
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Definition
| on the tentacles of pleurobrachia, and they secrete sticky material to hold animals |
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Definition
| a bell-like chamber: cilia sense changes in ressure from a statolith as the animal changes position - found in comb jellies |
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