15. Chordates posted - 16. Phylum Chordata Subph....

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Unformatted text preview: 16. Phylum Chordata Subph. Urochordata Subph . Cephalochordata Class Myxini Cl. Chondrichthyes Cl. Dipnoi Cl. Actinistia Cl. Actinopterygii Cl. Reptilia Cl. Amphibia Cl. Cephalaspidomorphi 17 17 18 19 20 21 22 23 24 25 Cl. Mammalia 17. Notochord 17. Notochord A Chordate phylogeny Pharyngeal gill slits Dorsal, tubular nerve cord Segmented muscles Notochord Postanal tail 17. Chordate traits Fig. 34.3 See fig. 34.2 Class Myxini Cl. Chondrichthyes Cl. Dipnoi Cl. Actinistia Cl. Actinopterygii Cl. Reptilia Cl. Amphibia Cl. Cephalaspidomorphi 17 17 18 19 20 21 22 23 24 25 Cl. Mammalia Subph. Urochordata Subph . Cephalochordata Subphylum Cephalochordata Subphylum Cephalochordata 1. Fishlike body form 2. No appendages 3. Locomotion: undulation of body and tail Fig. 34.5 ‘Lancelet’ 1 cm Class Myxini Cl. Chondrichthyes Cl. Dipnoi Cl. Actinistia Cl. Actinopterygii Cl. Reptilia Cl. Amphibia Cl. Cephalaspidomorphi 17 17 18 19 20 21 22 23 24 25 Cl. Mammalia Subph. Urochordata Subph . Cephalochordata http://www.ucmp.berkeley.edu/ http://www.ucmp.berkeley.edu/ chordata/urochordata.gif chordata/urochordata.gif Urochordata: Urochordata: Sea squirts Sea squirts 18. Cranium 18. Cranium Class Myxini Cl. Chondrichthyes Cl. Dipnoi Cl. Actinistia Cl. Actinopterygii Cl. Reptilia Cl. Amphibia Cl. Cephalaspidomorphi 17 17 18 19 20 21 22 23 24 25 Cl. Mammalia Subph. Urochordata Subph . Cephalochordata Class Myxini Cl. Chondrichthyes Cl. Dipnoi Cl. Actinistia Cl. Actinopterygii Cl. Reptilia Cl. Amphibia Cl. Cephalaspidomorphi 17 17 18 19 20 21 22 23 24 25 Cl. Mammalia Subph. Urochordata Subph . Cephalochordata Class Myxini (hagfishes) Class Myxini (hagfishes) Cartilaginous skull surrounds brain Notochord No appendages http://people.whitman.edu/~yancey/hagfish.jpg http://people.whitman.edu/~yancey/hagfish.jpg 19. Vertebral 19. Vertebral column column Class Myxini Cl. Chondrichthyes Cl. Dipnoi Cl. Actinistia Cl. Actinopterygii Cl. Reptilia Cl. Amphibia Cl. Cephalaspidomorphi 17 17 18 19 20 21 22 23 24 25 Cl. Mammalia Subph. Urochordata Subph . Cephalochordata Fig. 25.15 Fig. 25.15 Hox Hox gene complex gene complex duplication duplication 19. Subphylum Vertebrata19....
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This note was uploaded on 07/13/2008 for the course BIO 151 taught by Professor Grinblat during the Spring '08 term at University of Wisconsin Colleges Online.

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15. Chordates posted - 16. Phylum Chordata Subph....

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