Inquicus fellatus is an extinct, bowling pin-shaped gnathiferan[1] worm from the Chengjiang Biota, in what was once a marine environment from the Early Cambrian Yunnan province.

[2] Inquicus individuals were up to three centimeters long, shaped like a bowling pin with an elongated body that tapered to a slightly bulbous head.

[3] Although Inquicus attached to host worms, it is unlikely that the relationship was directly parasitic.

The species also was stiff, with there being no evidence that it could bend its mouth backwards to feed on the host.

It is more likely that they simply rode on their hosts while browsing for food, or used them as a form of locomotion.