What is "gnathostomulid"

n. (context zoology English) Any member of the Gnathostomulida, the phylum of jaw worms. They are nearly microscopic marine animals that inhabit sand and mud beneath shallow coastal waters.

Gnathostomulids, or jaw worms, are a small phylum of nearly microscopic marine animals. They inhabit sand and mud beneath shallow coastal waters and can survive in relatively anoxic environments. They were first recognised and described in 1956.