Chapter23Sum07

Chapter23Sum07 - Vertebrates Chapter 23 Vertebrates...

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Vertebrates Chapter 23
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Vertebrates – subphylum of Chordata Properties of vertebrates: 1.Skull 2.Backbone 3.Vertebrae
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Features of Chordates Features of Chordates at some stage of life cycle: - dorsal, hollow nerve cord - notochord - pharyngeal slits - post-anal tail
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Invertebrate chordates Lancelets – fish-shaped Tunicates – simplest Larvae – swimmers –side-by-side like fish Adults – attach to substrate and filter feed
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Fig. 23-2, p.378 DORSAL, TUBULAR NERVE CORD NOTOCHORD PHARYNX WITH GILL SLITS TAIL EXTENDING PAST ANUS eyespot tentacle-like structures around mouth epidermis segmented muscles (myomeres) midgut aorta gonad hindgut pore of atrial cavity anus Lancelet body plan defines the four chordate features:
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nerve cord notochord gut Tunicate larva Water in Water out pharynx with gill slits Tunicate adult Fig. 23-3, p.379 pharyngeal slits muscular tail
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Fig. 23-3c, p.379 Head end attaches to a substrate
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Protostomes – Arthropoda, Annelida, Mollusca Deuterostomes – Echinodermata, Chordata (whale, sea urchin, human, gut dev is same in embryonic development)
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sponges cnidarians echinoderms flatworms annelids mollusks roundworms arthropods chordates multicelled body radial ancestry, two germ layers true tissues coelom lost coelom reduced pseudocoel coelom reduced molting PROTOSTOMES mouth from blastopore bilateral, coelomate ancestry, three germ layers DEUTEROSOMES anus from blastopore Animal Evolutionary Tree
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Agnathans: (The vertebrate group lacking jaws, some cartilage around brain) A lamprey feeding on a fish.
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Common to most fish: Hinged jaws Gills Forefins and hind fins Carnivores
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skates rays sharks Skeleton is ? Avoid sinking by?
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Chapter23Sum07 - Vertebrates Chapter 23 Vertebrates...

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