Torquaratoridae (Latin for "neck plow") is a family of acorn worms (Hemichordata) that lives in deep waters between 350 and 4000 meters.

Cilia on their underside are used to glide over the ocean floor at about 8 cm (3 in) per hour, while detritus is sucked into their gut, leaving behind a constant trail of feces.

[2] One species (Coleodesmium karaensis) has been shown to care for the offspring by bearing about a dozen embryos surrounded by a thin membrane in shallow depressions on the surface of the mother's pharyngeal region.

Located on the inner surfaces of these flaps, the numerous ovaries and testicles bulge outwards in an epidermal pouch attached to the rest of the body by a slender stalk.

The extra-wide-lipped species shows the most obvious adaptations to the free living lifestyle, and they are found almost exclusively on rocks of deep-sea lava formations.