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Class Sarcopterygii (coelacanths, lungfishes)
• lobed fins
• bony supports to tips of fins
SUPERCLASS AGNATHAClass Myxini
Order Myxiniformes (hagfishes)Class Cephalaspidomorphi
Order Petromyzontiformes (lamprey)
SUPERCLASS GNATHOSTOMATAClass Chondrichthyes Subclass Holocephali
Order Chimaeriformes (chimaeras) Subclass Elasmobranchii
9 orders (sharks, rays, skates)Class Sarcopterygii Subclass Coelacanthimorpha
Order Coelacanthiformes (coelacanths) Subclass Dipnoi
Order Ceratodontiformes (Australian lungfish)Order Lepidosireniformes (S. American, African lungfish)
Class Actinopterygii - (rayfins, higher bony fishes) Subclass Chondrostei
Order Polypteriformes (birchirs, reedfish)Order Acipenseriformes (sturgeons, paddlefishes)
Subclass NeopterygiiOrder Semionotoformes (Lepisosteiformes) (gars)Order Amiiformes (bowfin)
Division Teleostei35-38 orders (modern body fishes)
SUPERCLASS GNATHOSTOMATAClass Sarcopterygii
Subclass Coelacanthimorpha
Order Coelacanthiformes (coelacanths)
• marine, deepwater species • spiral valve intestine• lobed fins homologous to tetrapod limbs• discovered in 1938 by Margaret Latimer• fossil forms in fresh, shallow waters
Latimeria chalumnae
SUPERCLASS AGNATHAClass Myxini
Order Myxiniformes (hagfishes)Class Cephalaspidomorphi
Order Petromyzontiformes (lamprey)
SUPERCLASS GNATHOSTOMATAClass Chondrichthyes Subclass Holocephali
Order Chimaeriformes (chimaeras) Subclass Elasmobranchii
9 orders (sharks, rays, skates)Class Sarcopterygii Subclass Coelacanthimorpha
Order Coelacanthiformes (coelacanths) Subclass Dipnoi
Order Ceratodontiformes (Australian lungfish)Order Lepidosireniformes (S. American, African lungfish)
Class Actinopterygii - (rayfins, higher bony fishes) Subclass Chondrostei
Order Polypteriformes (birchirs, reedfish)Order Acipenseriformes (sturgeons, paddlefishes)
Subclass NeopterygiiOrder Semionotoformes (Lepisosteiformes) (gars)Order Amiiformes (bowfin)
Division Teleostei35-38 orders (modern body fishes)
SUPERCLASS GNATHOSTOMATAClass Sarcopterygii
Subclass Dipnoi
Order Ceratodontiformes (Australian lungfish)
SUPERCLASS GNATHOSTOMATAClass Sarcopterygii
Subclass Dipnoi
Order Lepidosireniformes (African, S. Am. lungfish)
Ceratodontiformes Lepidosireniformes
(Australian) (S. American, African)body compressed cylindrical
pectoral, pelvic fins flipper-like filamentous
scales large small
gas bladder ("lung") unpaired paired
larvae no external gills with external gills
adults do not aestivate aestivate in dry season
(both) bladelike, crushing dermal ‘teeth’
Class Actinopterygii
• 50 % of known fishes• rayed fins• swim bladder
SUPERCLASS AGNATHAClass Myxini
Order Myxiniformes (hagfishes)Class Cephalaspidomorphi
Order Petromyzontiformes (lamprey)
SUPERCLASS GNATHOSTOMATAClass Chondrichthyes Subclass Holocephali
Order Chimaeriformes (chimaeras) Subclass Elasmobranchii
9 orders (sharks, rays, skates)Class Sarcopterygii Subclass Coelacanthimorpha
Order Coelacanthiformes (coelacanths) Subclass Dipnoi
Order Ceratodontiformes (Australian lungfish)Order Lepidosireniformes (S. American, African lungfish)
Class Actinopterygii - (rayfins, higher bony fishes) Subclass Chondrostei
Order Polypteriformes (birchirs, reedfish)Order Acipenseriformes (sturgeons, paddlefishes)
Subclass NeopterygiiOrder Semionotoformes (Lepisosteiformes) (gars)Order Amiiformes (bowfin)
Division Teleostei35-38 orders (modern body fishes)
Birchir (Polypterus weeksi)• ganoid scales and scutes• (abbreviate) heterocercal tail• skeleton largely cartilaginous• intestine with spiral value
reedfish - pelvics absent; bichirs - pelvics present
Acipenseriformes – paddlefish, sturgeon
• ganoid scales (and scutes)• heterocercal tail• skeleton largely cartilaginous• intestine with spiral value
SUPERCLASS AGNATHAClass Myxini
Order Myxiniformes (hagfishes)Class Cephalaspidomorphi
Order Petromyzontiformes (lamprey)
SUPERCLASS GNATHOSTOMATAClass Chondrichthyes Subclass Holocephali
Order Chimaeriformes (chimaeras) Subclass Elasmobranchii
9 orders (sharks, rays, skates)Class Sarcopterygii Subclass Coelacanthimorpha
Order Coelacanthiformes (coelacanths) Subclass Dipnoi
Order Ceratodontiformes (Australian lungfish)Order Lepidosireniformes (S. American, African lungfish)
Class Actinopterygii - (rayfins, higher bony fishes) Subclass Chondrostei
Order Polypteriformes (birchirs, reedfish)Order Acipenseriformes (sturgeons, paddlefishes)
Subclass NeopterygiiOrder Semionotoformes (Lepisosteiformes) (gars)Order Amiiformes (bowfin)
Division Teleostei35-38 orders (modern body fishes)
Semionotiformes (Lepisosteiformes), Lepisosteidae
• ganoid scales• abbreviated heterocercal tail• intestine with spiral valve • lung-like gas bladder
longnose gar (Lepisosteus osseus)
Amiiformes, Amiidae
• ganoid scales• abbreviated heterocercal tail• intestine with spiral value • lung-like gas bladder
bowfin (Amia calva)