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Unformatted text preview: Sharks Phylum Chordata Subphylum Urochordata (tunicates, 3,000 species) Subphylum Cephalochordata (lancelets, 30 species) Subphylum Craniata (vertebrates animals with backbones; 57,674 species) Class ' Agnatha (jawless vertebrates; 100+ species) Subclass Myxinoidea (hagfish; 65 species) Subclass Petromyzontida (Lampreys) Subclass Conodonta Subclass Pteraspidomorphi (Paleozoic jawless fish) Order Anaspida Order Thelodonti (Paleozoic jawless fish) Infraphylum Gnathostomata ( jawed vertebrates) Class Placodermi (Paleozoic armoured forms) Class Chondrichthyes (cartilaginous fish; 900+ species) Class Acanthodii (Paleozoic "spiny sharks") Class Osteichthyes (bony fishes; 30,000+ species) Subclass Actinopterygii (ray-finned fish; about 30,000 species) Subclass Sarcopterygii (lobe-finned fish) Superclass Tetrapoda (four-legged vertebrates; 18,000+ species) Class Amphibia (amphibians; 6,000 species) Class Reptilia (reptiles; 8,225+ species) Class...
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This note was uploaded on 02/22/2012 for the course MSCI 102 taught by Professor Benner during the Spring '10 term at South Carolina.
- Spring '10