The family is characterised by the absence of spines on the trunk and the presence of just two cement glands (used to temporarily close the posterior end of the female after copulation), heavily coiled lemnisci (bundles of sensory nerve fibers) that are enclosed in a membranous sac.

[1] Golvan, in 1969, placed the genus Pararhadinorhynchus in the family Diplosentinae because they had two cement glands and no trunk spines.

In the same year, Golvan created Allorhadinorhynchinae based on the genus Allorhadinorhynchus which has two cement glands and trunk spines.

D. amphacanthi was collected in the Philippines from the White-spotted spinefoot (Siganus canaliculatus but reported as the synonym Amphacanthus oramin) which occurs widely in the tropical Indo-Pacific.

[1] It is commonly found parasitizing the Flathead grey mullet (Mugil cephalus).