BIO 124 Lecture Notes - Lecture 14: Actinopterygii, Swim Bladder, Craniate
21 Mar 2016
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Poikilothermic cold blooded, attain heat from external environment. Fish, amphibians, and reptiles: subphylum urochordata. Adult is sessile and feeds via pharyngeal slits: subphylum cephalochordata. Class myxini hagfish: no vertebral column, have cartilage skull. Vertebral column main support for the body axis, allows for large size and fast movement and protection of the nerve cord. Endoskeleton is made of cartilage or bone and is strong, flexible, and can grow. Diversity of internal organs liver, heart, endocrine system. Marine and freshwater: well developed eyes, lateral line system, pineal eye, all species reproduce in freshwater. Class placodermi: totally fossil, early jawed fishes, bony armor usually present around head-trunk, generally flattened body, tend to be bottom-adapted with eyes rather dorsal, no true teeth, notochord persistent. Class acanthodii: spiny fish, anterior margin of each fish supported by a spine, spines along the lower lateral part of the body.
