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Class: Agnatha are?
jawless vertebrates (suckers)
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Name the characteristics of Class: Agnatha.
- No paired appendages
- Cartilage Skeleton
- single nostril on top of head (monorhinous)
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List the other information about Class: Agnatha.
Ostracoderms are the oldest known fossil vertebrates, covered externally by bony plates. (No fins)
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What are the subclasses of Class: Agnatha?
- Petromyzontia (Lampreys)
- Myxinoidea (Hagfish)
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Class: Placodermi are?
first jawed vertebrates.
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Name the characteristics of Class: Placodermi.
- Heavy bony armor
- paired fins developing
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List the other information about Class: Placodermi.
It was known only from fossils, some investigators consider then a subclass of Chondrichthyes.
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What are Class: Chondrichthyes?
cartilagenous jawed fishes.
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Name the characteristics of Class; Chondrichthyes.
- upper jaw not attached to braincase
- teeth from placoid scales
- internal ferilization with claspers
- most ovoviviparous
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What are the subclasses of Class: Chondrichthyes?
- Elasmobranchii
- Holocephali
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What are the orders in Class:Chondrichthyes Subclass: elasmobranchii?
- order squaliformes (True shark)
- order Rajiiformes (Skates and rays)
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What is the order in Class: Chondrichthyes Subclass Holocephali?
order Chimaeriformes (Ratfishes and chimaeras)
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What are Class: Acanthodii?
spiny sharks (extinct) 3-5 inches long
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List the information about Class: Acanthodii.
some investigators group these with Osteichthyes, some with Placodermi, and some say they stand apart.
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What are Class: Osteichthyes?
Bony fishes; have jaws, paired appendages, and dermal scales.
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What are the subclasses in Class Osteichthyes?
- Sarcopterygii (lobe finned fishes)
- Actinopterygii (ray-finned fishes)
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What are the orders in Class: Osteichthyes subclass Sarcopterygii?
- Order Crossopterygii
- Order Dipnoi ( Lung fishes )
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What are the infraclasses in Class: Osteichthyes Subclass Actinopterygii?
- Chondrostei (Sturgeons and paddlefishes)
- Neopterygii ( Gars and bowfin, modern ray finned fishes)
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