Order EVENTOGNATHI 



As Heterognathi, but with hrain case produced between orbits 



Family CATOSTOMIDAE Suckers 



Family CYPRINIDAE Minnows 



Family MEDIDAE Desert Minnows 

 Order NEMATOGNATHI 



Scaleless; the first four vertebrae coossified with the Weberian 



apparatus 



Family AMEIURIDAE Catfishes 

 Order HAPLOMI 



Soft-rayed fishes, with no mesocoracoid; pelvic fins abdominal; 



maxillary forming side of upper jaw 



Family ESOCIDAE Pikes 



Family UMBRIDAE Mud-minnows 



Family NOVUMBRIDAE Western Mud-minnow 

 Order CYPRINODONTES 



As in Haplomi, but with the side of upper jaw formed by the pre- 



maxillary 



Family CYPRINODONTIDAE KiUifishes 



Family EMPETRICHTHYIDAE Death Valley Minnow 



Family POECILIIDAE Top-minnows 



Family AMBLYOPSIDAE Cave Blindfishcs 

 Order SYNENTOGNATHI 



Pelvic fins abdominal; dorsal and anal fins without spines; dorsal 



fin much posterior; air bladder ductless; lateral line forming a ridge 



along side of belly 



Family BELONIDAE Needlefishes 

 (Many marine genera and species) 

 Order ANACANTHINI 



Pelvic iins jugular; dorsal fin extending almost the length of the 



back; tail isocercal; scales small or absent 



Family GADIDAE Codfishes 



(Many marine genera and species) 

 Order SALMOPERCAE 



Dorsal fin with two spines; adipose fin present; head naked; air 



bladder with rudimentary duct 



Family PERCOPSIDAE Trout-perch 

 Order XENARCHI 



With a spiny dorsal fin; anus jugular; scales ctenoid 



Family APHREDODERIDAE Pirate-perch 

 Order HETEROSOMATA 



Cranium twisted anteriorly; both eyes on the same side of the 



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