Percopsidae

Percopsidae is a family of fish in the order Percopsiformes, with one extant genus with two species, both endemic to North America, and five described fossil genera.^[4]

Percopsidae
Percopsis omiscomaycus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Actinopterygii
Order:	Percopsiformes
Family:	Percopsidae Agassiz, 1850
Genera[1][2]
†Amphiplaga Cope, 1877 †Erismatopterus Cope, 1870 †Libotonius Wilson, 1978 †Lindoeichthys Murry et al., 2020 †Massamorichthys Murray, 1996 Percopsis Agassiz, 1849
Synonyms
Libotoniidae Grande, 1988[3]

Amphiplaga brachyptera

They are small fish with weak fin spines, and an adipose fin similar to those of trout. They feed on insects and small crustaceans.^[5]