Cavisomidae are a family of parasitic worms from the order Echinorhynchida.

Cavisomidae contains the following genera:[1][a] Caballerorhynchus Salgado-Maldonado, 1977 contains one species: Cavisoma Van Cleave, 1931 contains one species: Cavisoma magnum (Southwell, 1927)[2] C. magnum (Southwell, 1927) Van Cleave, 1931 was originally described as Oligoterorhynchus magnus by Southwell[3] from the stomach and pyloric ceca of the sea bass, Serranus sp.

(Serranidae) and from another fish, the spotted surgeonfish Ctenochaetus strigosus (Acanthuridae) off Negapatam, (Sri Lanka).

Other hosts include milkfish Chanos chanos (Chanidae),[4][2] Siganus lineatus (Siganidae),[5] and Grey mullet, Mugil cephalus (Mugilidae).

[2] Localities include Sri Lanka, the Red Sea, the Philippines, New Caledonia, and Iraq.