Taxonomy and Classification of Fish
Station 1. Fish Diversity
Classification of the Major Taxa of Fish
! Phylum Chordata ! Subphylum Vertebrata ! Supraclass Agnatha ! Order Osteostraci ! Order Anaspida ! Order Heterostraci ! Order Coelolepida ! Order Cyclostomata ! Class Myxinoidea ! Class Petromyzontida ! Class Placodermi ! Order Arthrodiriformes ! Order Antiarchiformes ! Supraclass Gnathostomata ! Class Chondrichthyes ! Subclass Elasmobranchii ! Order Cladoselachiformes ! Order Xenacanthiformes ! Order Selachii ! Order Batoidea ! Subclass Holocephali ! Order Chimaeriformes ! Class Acanthodii ! Class Osteichthyes ! Subclass Actinopterygii ! Infraclass Chondrostei ! Infraclass Holostei ! Infraclass Teleostei ! Subclass Sarcopterygii ! Order Crossopterygii ! Order Dipnoi examples jawless fishes
hagfish lampreys
jawed fishes
extinct Paleozoic sharks Paleozoic freshwater sharks typical sharks skates and rays chimaeras or ratfishes various extinct fishes higher bony fishes ray-finned fishes sturgeon, paddlefish; primitive ray-finned fishes gars, bowfins; dominant ray-finned fishes of Mesozoic most bony fish; dominant in Cenozoic and recent times lobe-finned fishes ancestors of land vertebrates lungfishes
Station 1. Fish Diversity
CLASS: AGNATHA
JAWLESS FISHES includes the living forms LAMPREYS and HAGFISHES, and several extinct forms
The jawless fish (supraclass Agnatha; a = without, gnathos = jaws) include the extinct ostracoderms and the living lamprey eels and hagfishes. Ostracoderms, the earliest known fossil chordates, have been found in the rocks of the Ordovician, Silurian and Devonian periods, These jawless fish were small, armored, bottom-dwelling freshwater filter feeders. The head was covered with thick bony plates, and the trunk and tail were covered with thick scales. Ostracoderms had median fins; some species had paired pectoral fins. The living relatives of the Ostracoderms are the lampreys and hagfishes. These animals have cylindrical bodies up to a meter long
Classification of the Major Taxa of Fish
! Phylum Chordata ! Subphylum Vertebrata ! Supraclass Agnatha ! Order Osteostraci ! Order Anaspida ! Order Heterostraci ! Order Coelolepida ! Order Cyclostomata ! Class Myxinoidea ! Class Petromyzontida ! Class Placodermi ! Order Arthrodiriformes ! Order Antiarchiformes ! Supraclass Gnathostomata ! Class Chondrichthyes ! Subclass Elasmobranchii ! Order Cladoselachiformes ! Order Xenacanthiformes ! Order Selachii ! Order Batoidea ! Subclass Holocephali ! Order Chimaeriformes ! Class Acanthodii ! Class Osteichthyes ! Subclass Actinopterygii ! Infraclass Chondrostei ! Infraclass Holostei ! Infraclass Teleostei ! Subclass Sarcopterygii ! Order Crossopterygii ! Order Dipnoi examples jawless fishes
hagfish lampreys
jawed fishes
extinct Paleozoic sharks Paleozoic freshwater sharks typical sharks skates and rays chimaeras or ratfishes various extinct fishes higher bony fishes ray-finned fishes sturgeon, paddlefish; primitive ray-finned fishes gars, bowfins; dominant ray-finned fishes of Mesozoic most bony fish; dominant in Cenozoic and recent times lobe-finned fishes ancestors of land vertebrates lungfishes
Station 1. Fish Diversity
CLASS: AGNATHA
JAWLESS FISHES includes the living forms LAMPREYS and HAGFISHES, and several extinct forms
The jawless fish (supraclass Agnatha; a = without, gnathos = jaws) include the extinct ostracoderms and the living lamprey eels and hagfishes. Ostracoderms, the earliest known fossil chordates, have been found in the rocks of the Ordovician, Silurian and Devonian periods, These jawless fish were small, armored, bottom-dwelling freshwater filter feeders. The head was covered with thick bony plates, and the trunk and tail were covered with thick scales. Ostracoderms had median fins; some species had paired pectoral fins. The living relatives of the Ostracoderms are the lampreys and hagfishes. These animals have cylindrical bodies up to a meter long