Silurid fish and Siluriform fish

Silurid fish noun - Old World freshwater catfishes having naked skin and a long anal fin more or less merged with the eellike caudal fin.

Siluriform fish and silurid fish are semantically related. In some cases you can use "Siluriform fish" instead a noun phrase "Silurid fish".

Siluriform fish noun - Any of numerous mostly freshwater bottom-living fishes of Eurasia and North America with barbels like whiskers around the mouth.

Silurid fish and siluriform fish are semantically related. Sometimes you can replace phrase "Silurid fish" with "Siluriform fish", this phrases are similar.