Percopsiformes
Encyclopedia
Percopsiformes is a small order of ray-finned fish
, comprising the trout-perch and its allies. It contains just nine species, grouped into three families.
They are generally small fish, ranging from 5 centimetres (2 in) to 20 centimetres (7.9 in) in adult body length. They inhabit freshwater habitats in North America. They are grouped together because of technical characteristics of their internal anatomy, and the different species may appear quite different externally.
Actinopterygii
The Actinopterygii or ray-finned fishes constitute a class or sub-class of the bony fishes.The ray-finned fishes are so called because they possess lepidotrichia or "fin rays", their fins being webs of skin supported by bony or horny spines , as opposed to the fleshy, lobed fins that characterize...
, comprising the trout-perch and its allies. It contains just nine species, grouped into three families.
They are generally small fish, ranging from 5 centimetres (2 in) to 20 centimetres (7.9 in) in adult body length. They inhabit freshwater habitats in North America. They are grouped together because of technical characteristics of their internal anatomy, and the different species may appear quite different externally.
Families
- PercopsidaePercopsidaePercopsidae is a family of fish in the order Percopsiformes. Its living members are two North American fresh water species of the genus Percopsis, trout-perch Percopsis omiscomaycus and sand roller Percopsis transmontana .They are small fish with weak fin spines, and an adipose fin similar to...
(trout-perches) - Aphredoderidae (pirate perch)
- Amblyopsidae (cavefishes)