taxonomy of non-teleosts

Class Cyclostoma; Family Myxinoformes

hagfish; anguilliform w/subterminal mouth surrounded by 6 barbels; diphycercal caudal fin

Class Cyclostoma; Family Petromyzontiformes

lamprey; anguilliform w/inferior mouth; teeth on hood and tongue; 7 gill slits

Class Heterostraci (extinct)

somewhat compressed body w/subterminal mouth; hypocercal tail; bony shield covering head & anterior body

Class Anaspida (extinct)

compressed body w/terminal mouth; hypocercal tail; body covered in small bony plates

Class Osteostraci (extinct)

depressed head w/inferior mouth; heterocercal tail, covered by bony shield; pectoral fins

Class Placodermi; Order Antiarchi (extinct)

Superclass Gnathostoma; armored, jawed fish; somewhat depressed w/small inferior mouth; very large pectoral fins; heavily armored anteriorly

Class Placodermi; Order Arthrodira (extinct)

Superclass Gnathostoma; large terminal mouth, small pectoral fins, heavily armored anteriorly

Class Chondrichthyes; Family Chimaeriformes

Subclass Holocephali; large head w/large eyes; terminal mouth; large spine anteriror to dorsal fin; cephalic clasper in male

Class Chondrichthyes; Family Heterodontiformes

Subclass Elasmobranchii; no operculum; heavy spines at dorsal fins; inferior mouth

Class Chondrichthyes; Family Carcharhiniformes

Subclass Elasmobranchii; no operculum; dorsal fins spineless; inferior mouth; nictitating membrane; anal fin present

Class Chondrichthyes; Family Lamniformes

Subclass Elasmobranchii; no operculum, dorsal fins spineless, lack nictitating membrane; elongate and serrated teeth

Class Chondrichthyes; Family Squaliformes

dogfish shark; inferior mouth, large spiracles, some with fin spines

Class Chondrichthyes; Family Squatiniformes

angel sharks; pectoral fins greatly enlarged, depressed head and body, gill slits opening laterally, subterminal mouth, pectoral fins not attached to head

Class Chondrichthyes; Family Rajiformes

Subdivision Batodei; very thin tail w/two small dorsal fins but caudal tail reduced or absent OR tail thick w/two dorsal fins and well-developed caudal fin, dorsal spines usually present

Class Chondrichthyes; Family Myliobatiformes

Subdivision Batodei; tail very thin w/no caudal or dorsal fin, no spines, elongate sting down dorsum of tail

Class Osteichthyes; Infraclass Actinistia (extinct)

coelacanths; terminal mouth, slightly compressed body

Class Osteichthyes; Infraclass Dipnoi (extinct)

true lungfishes; heterocercal tail, two dorsal fins, pointed paired fins w/fleshy basal lobes extending almost to tip

Class Osteichthyes; Family Lepidosireniformes

lungfishes; terminal mouth, body somewhat anguilliform, diphycercal tail