1) Family cobitidae 2) Fish family 3) Loaches 
The Cobitidae, the true loaches, are a family of Old World freshwater fish. They occur throughout Eurasia and in Morocco, and inhabit riverine ecosystems. Today, most `loaches` are placed in other families (see below). New species are being described regularly. ==Description and ecology== The body forms of the Cobitidae tend to be vermiform – .....
[n] - loaches
family Cobitidae noun loaches