Intro to - Phylum Chordata (Fish, Amphibians, Reptiles, Birds and Mammals)
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Transcript of Intro to - Phylum Chordata (Fish, Amphibians, Reptiles, Birds and Mammals)
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Intro to - Phylum Chordata (Fish, Amphibians, Reptiles, Birds and Mammals)
Chordates, at some stage in their lives, have a:
• Dorsal (hollow nerve cord), • Notochord (supports nerve cord during embryonic
phase), • Pharyngeal pouches (paired slits in throat region –
can become gills)• Tail that extends beyond anus
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Intro to - Phylum Chordata Most Chordates are Vertebrate, meaning
they have a back bone Fish, Amphibians, Reptiles, Birds and Mammals
2 exceptionsTunicates Lancelets
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Phylum Chordata - Fish
Aquatic vertebrates; most have paired fins, scales, and gills
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Environment Salt and Fresh water Most fish cannot live in both types of
water because their kidneys cannot maintain homeostasis
Food Source Herbivores, carnivores, parasites, filter
feeders, and detritus feeds (a single fish may exhibit several modes of feeding, depending on what type of food is available)
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Maintaining Homeostasis - Internal(Circulation, Respiration, Excretion)
Have gills
Closed circulatory system with a heart that pumps blood around the body in a single loop from heart to gills then gills to rest of body
Rid their body of nitrogenous waste through ammonia through the gills or kidney
Maintaining Homeostasis - External(Response)
Well developed nervous system with a brain, cerebrum, cerebellum, and a medulla oblongata.
Lateral line system- senses other fish or prey near by
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Movement They alternate contracting paired sets of
muscles on either side of the backbone, creating a S-shaped curve down their bodies
Reproduction External or Internal fertilization In many fish the female lays the eggs
and the embryos develop and hatch outside of her body.Evolutionary Milestone Vertebrate - notochord
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Picture and Vocabulary Picture on page 771 Figure 30-6
Vocabulary: cartilage(773), swim bladder(777)