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Cards In This Set
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In order to be a member of the Phylum Chordata an organism must meet four criteria
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1. dorsal (hollow nerve chord)
2. notochord
3. pharyngeal pouches
4. tail (that extends beyond the anus)
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What is a notochord?
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Long supporting rod that runs through the body below the nerve chord
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In vertebrates the notochord is replaced by
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Backbone aka vertabrae
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What are slits found near the throat of a chordate which may develop into gills?
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Pharyngeal pouches
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What is lost during many adult stages of humans?
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Tails
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What is below the hollow nerve chord?
(aka picture)
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Notochord
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What are openings near the chordates stomach?
(aka picture)
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Pharyngeal pouches
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Nonvertabrate chordates, fishes, amphibians, reptiles, birds, and mammals all come from an _______ ancestor
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Invertebrate
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–__% of chordates are in the subphylum Vertebrata
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96%
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Two subphyla/ non vertabrates are
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1. tunicates
2.lancelets
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What's in common with tunicates and lancelets.
what is the differencee?
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Common: filter feeders
difference: tunicates grow out of chordate characteristics. lancelets also have head+mouth
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3 characteristics of fish
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Paired fins, scales, gills
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What is the protective bony covers of gills?
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Operculum
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Respiration in fish happens thru?
they are made of what?
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Gills for gas exchange
(filaments with capillaries)
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What five things do fish use for feeding?
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Mouth, stomach, esophagus, pyloric ceca, intestine, anus
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