EEB 109 Week 4 Lab Manual - EEB 109 LAB INTRODUCTION TO...

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EEB 109 LAB INTRODUCTION TO MARINE SCIENCE Summer 2007 BONY FISHES The Bony Fishes (Superclass Osteichthyes) Introduction The Phylum Chordata shows a remarkable diversity in form, from small invertebrate sea squirts to mammals. Most members of this phylum belong to the Subphylum Vertebrata , which includes fish, amphibians, reptiles, birds and mammals. A few are members of the invertebrate Subphylum Urochordata (tunicates and sea squirts) and Cephalochordata ( Branchiostoma sp.). These diverse forms are included in the same phylum because they have some general characteristics in common. All members of the Phylum Chordata, at some time in their development, have a notochord (a stiff but flexible rod of cartilage for support), pharyngeal gill slits or arches and a dorsal hollow nerve cord . In tetrapods (four-limbed vertebrates) the pharyngeal gill slits are found only in the embryonic stages. Other chordates include the “fishes”. However, a fish is sometimes difficult to define. Usually this aquatic vertebrate is covered with scales, has fins, is poikilothermic (“cold blooded”) and obtains O 2 from the water with gills. But some exceptions can be found to all these general characteristics.
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  • Winter '08
  • CASSANO
  • Bony Fishes, pharyngeal gill slits, Phylum Chordata

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