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Chordates Zoology Donald Winslow 4 April 2008 Following Hickman et al. 2008, Ch 23 pp 497-506, 508-510, 512 (protochordates & early vertebrates)‏ Ch 24.

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Presentation on theme: "Chordates Zoology Donald Winslow 4 April 2008 Following Hickman et al. 2008, Ch 23 pp 497-506, 508-510, 512 (protochordates & early vertebrates)‏ Ch 24."— Presentation transcript:

1 Chordates Zoology Donald Winslow 4 April 2008 Following Hickman et al. 2008, Ch 23 pp , , 512 (protochordates & early vertebrates)‏ Ch (fishes); Ch (amphibians)‏ Ch (reptiles); Ch (birds); Ch (mammals)‏

2 Characteristics of chordates Notocord, often endoskeleton Dorsal hollow nerve cords Often predators Pharyngeal gill slits, often become gills Paired appendages—fins, limbs, wings Postanal tail Segmented myotomes

3 Phylum Chordata Subphylum Urochordata—tunicates Subphylum Cephalochordata—lancelets Subphylum Vertebrata (Craniata)‏ –The fishes (paraphyletic)‏ –Class Amphibia (paraphyletic)‏ –Class Reptilia (paraphyletic)‏ –Class Aves (monophyletic)‏ –Class Mammalia (monophyletic)‏

4 Quasi-cladistic classification Chordata –Urochordata –Euchordata Cephalochordata Craniata –Myxini (hagfishes)‏ –Petromyzontida (lampreys)‏ –Gnathostomata (jawed fishes & tetrapods)‏ »Chondrichthyes (cartilaginous fishes)‏ »Teleostomi (bony fishes & tetrapods)‏

5 The Teleostomi Osteichthyes (bony fishes)‏ –Class Actinopterygii (ray-finned fishes)‏ –Class Sarcopterygii (lobe-finned fishes)‏ Tetrapoda (terrestrial four-legged beasts)‏ –Class Amphibia –Amniota Class Reptilia & Class Aves (birds)‏ Class Mammalia

6 The Fishes Pisces, ichthyology Superclass Agnatha (jawless fishes)‏ –Slender, eel-like, median fins –Cartilaginous skeleton, persistent notochord –No vertebrae –External fertilization, separate sexes Superclass Gnathostomata –Jawed fishes & tetrapods

7 Superclass Agnatha Class Myxini (hagfishes)‏ –Feed on dead & dying animals, knots Class Petromyzontida (lampreys)‏ –Ectoparasites –Larvae (ammocoetes) resemble Amphioxus

8 Gnathostomes Class Chondrichthyes (cartilaginous fishes)‏ –Subclass Elasmobranchii (sharks & rays)‏ –Subclass Holocephali (chimaeras)‏ Osteichthyes (bony fishes)‏ –Class Actinopterygii (ray-finned fishes)‏ Chondrosteans (sturgeon, paddlefish, bichir)‏ Neopterygians (bowfins, gars, teleosts)‏ –Class Sarcopterygii (lobe-finned fishes)‏ Lungfishes & coelacanth

9 Spotted Gar


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