Microdesmidae
This family is often refered to as the wormfish family. These are similar to the fish from the family of Kraemeriidae in the fact that they too will submerge themselves in the sand and mud. The only difference is the anatomical appearance of the Microdesmidae family. Fishes in the Microdesmidae family are small fish which often resemble an eel.
Read more about this topic: Gobioidei