Isthomosacanthidae is a family of parasitic spiny-headed (or thorny-headed) worms.

G. golvani was found parasitizing the Atlantic chub mackerel (Scomber colias).

[2] Gorgorhynchoides Cable and Linderoth, 1963 contains many species.

Found in Australia and has 14 to 16 rows of 3 large, 7 spiniform hooks on their proboscis.

Isthomosacanthidae species parasitize fish hosts.