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These are the lecture slides of Introduction to Biology. Key important points are: Vertebrate Biology, Phylum Chordata, Class Chondrichthyes, Class Placodermi, Class Osteichthyes, Possess Medial Nostril, Hagfish Characteristics, Lamprey Characteristics, Modern Sharks
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Subphylum Urochordata
Subphylum Cephalochordata
Subphylum Vertebrata
tunicates lancets^ Agnathans Fish Sharks tetrapods
Class Agnatha , the jawless fishes Subclass (or order) Cyclostomata, the lampreys and hagfishes.
Class Chondrichthyes , the cartilaginous-skeleton fishes Subclass Holocephali, the chimaeras, or ratfishes Subclass Elasmobranchii, the sharks, skates, and rays
Class Placodermi
Class Acanthodii
Class Osteichthyes , the bony fishes Subclass Actinopterygii, the ray-finned fishes Superorder Chondrostei, the primitive ray-finned bony fishes: sturgeons, paddlefish, and bichirs Superorder Holostei or Neopterygii, the intermediate ray-finned fishes: gars and the bowfin Superorder Teleostei or Neopterygii, the advanced bony fishes: herring, salmon, perch. Subclass Crossopterygii, the coelacanth Subclass Dipnoi or Dipneusti, the lungfishes
Class Agnatha
Characteristics
Sharks, skates, rays, chimera
Class Chondrichthyes
Ovipary - eggs enclosed in capsule; eggs are laid and hatched outside the mother
Ovovipary - give birth to young, eggs develop in uterus
Vivipary - give birth to young, placental connection
Class Placodermi
Superorder Chondrostei
Superorder Holostei
Acanthostega
Ichthyostega
Transition fossil from fw Crossopterygian to tetrapod
Class Amphibia
Characteristics
3,500 species
Class Amphibia
“Canaries in the coal mine”