1) Family solenidae 2) Mollusk family 3) Razor clams 
Solenidae, commonly called `razor shells,` is a family of marine bivalve mollusks in the unassigned Euheterodonta. ==Taxonomy== Originally razor shells were all classified as Solenidae. Then the genera were grouped into two sub-families, the Cultellinae and Soleninae. Later, the two subfamilies were recognized as separate families, with Cultelli.....
[n] - razor clams
family Solenidae noun razor clams