Term
| What are the oldest echinoderms? |
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Definition
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Term
| which side is up in crinoids? |
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Definition
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Term
| What are tube feet modified for in crinoids? |
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Definition
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Term
| how do crinoids hold to rocks? |
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Definition
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Term
| what are some common names of crinoids? |
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Definition
| sea lilies, feather stars. these are ansectral to sea stars. |
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Term
| What type of symmetry do most echinoderms have? |
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Definition
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Term
| Echinoderms are most closely related to whom? |
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Definition
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Term
| how are echinoderms related to chordates? |
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Definition
deuterostomes
radial cleavage-indeterminate development
gill slits present in larval form(bilateral)
enterocoely |
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Term
| What is the common name for ophithuroidea? |
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Definition
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Term
| what is the class of brittle stars? |
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Definition
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Term
| what are overlapping pieces of exoskeloton called? |
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Definition
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Term
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Definition
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Term
| what is the common name of holothuroidea? |
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Definition
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Term
| what is the class of sea cucumbers? |
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Definition
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Term
| What is the symmetry of the sea cucumber? |
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Definition
| still penaradial but secondarily bilateral |
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Term
| do sea cucumbers have a hard skeleton? |
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Definition
| no. very soft. ossicles scattered through out. |
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Term
| what is respiratory structure in sea cucumber(holothuroidea)? |
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Definition
| respiratory tree. butt breathing. |
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Term
| what assists in respiration for cucumber? |
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Definition
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Term
| what is the functions of body cavities in echinos? |
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Definition
circulation,
skeleton/move
excretion
reproduction(broadcast spawn)
space to grow/move. |
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Term
| what is a tripartate coelum? |
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Definition
3 cavities formed during embryo
general for circulation
water vascular unique to echi's
perihemal - distribution of nutrients |
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Term
| what is the water vascular system used for? |
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Definition
| circulation, movement, gas exchange. |
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Term
| how many skeletons in echino's? |
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Definition
2
hard for protection
hydrostatic-water vascular system |
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Term
| what is class echinoidea? |
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Definition
| sea urchins, sand dollars |
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Term
| what is the class of sea urchins/sand dollars? |
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Definition
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Term
| what is unique to echnoidea(urchins etc) |
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Definition
| ambulacral regions extend to aboral side(not ventral) |
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Term
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Definition
| clean off themsleves in echino's(stars/urchins) |
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Term
| who has aristotles lantern and what is it? |
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Definition
class echinoidea(urchins,$)
specialized mouth parts for scraping/eating algae and kelp |
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Term
| who has poisonous pedicellariae sometimes? |
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Definition
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Term
| what is the respiration in urchins echinoidea? |
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Definition
| tube feet sticking out all around. for gas exchange. |
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Term
| are urchins, echinoidea, secondarily bilateral too? |
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Definition
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Term
| what kind of repiration/circulation in echinoderms? |
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Definition
| get oxygen out of water by countercurrent system |
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Term
| describe countercurrent in echino's |
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Definition
picks up O2 from water flowing past.
flows past general coelum for drop off. |
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Term
| what is common name for asteroidea? |
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Definition
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Term
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Definition
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Term
| what does only asteroidea haveZ? and what it does? |
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Definition
| catch collagen between ossicles that they can use to change from liquid to solid in order to pry open mussels etc. |
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Term
| what do sea stars do with their cardiac stomach? |
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Definition
| evert stomach outside to release enzymes and digest soft parts of prey |
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Term
| how many parts of sea star do you need for regeneration? |
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Definition
| only one. regenerates completely. |
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Term
| what do pedicillariae do? |
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Definition
| clean surface of animals , echino's |
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Term
| what is endoskeloton made of in sea stars? |
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Definition
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Term
| another name for endoskeleton? |
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Definition
|
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Term
| what can you have between ossicles(hard skeleton) |
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Definition
| dermal branchia for gas exchange. |
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Term
| where is radial canal found on sea stars? |
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Definition
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Term
| how does hydrostatic skeleton work? |
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Definition
muscles push on fluid,notbones.
longitudinal muscles shorten tube foot--fluid goes back to ampullae. |
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Term
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Definition
| yes eyes spots on each end of arm |
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Term
| what is another way to describe sand $? |
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Definition
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Term
| what are the fastest moving echinoderms? |
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Definition
| brittle stars ophiuroidea |
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Term
| where are gonads located in sea star? |
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Definition
| below pyloric caecae in arms. |
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Term
| where are the tentacle retractor muscles on a cucumber? |
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Definition
| attach inside tentcles and to body wall |
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Term
| where are the tentacle retractor muscles on a cucumber? |
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Definition
| attach inside tentcles and to body wall |
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Term
| what is and where is polian vessicle? |
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Definition
attached to ring canal in cucumber near mouth.
help water vascular system |
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