Lab13_Chordata - Phylum Chordates Defined by the presence...

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1 Phylum Chordates Defined by the presence of four morphological features : (1) pharyngeal gill slits, (2) a notochord, (3) a dorsal hollow nerve cord, and (4) a muscular tail that extends past the anus. Hemichordates are not members of phylum Chordata because they have only pharyngeal gill slits that function in feeding and gas exchange. (dorsal hollow nerve cord) (pharyngeal gill slits) Phylum Chordates Include 42,500 species of fish, amphibians, reptiles, and mammals. Bony skeleton provides sites for muscle attachment for efficient movement. Three subphylum – Urochordata (tunicates) suspension feeders that live attached to hard substrates in the ocean. – Cephalochordata (lancelets) look like fish – Vertebrata
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