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