Eukaryota  >  Metazoa  >  Acanthocephala  >  Palaeacanthocephala  >  Echinorhynchida

Family	Genus	Species
Arhythmacanthidae	2	6
Cavisomatidae	1	2
Echinorhynchidae	2	41
Heteracanthocephalidae	1	2
Leptorhynchoididae	9	20
Pomphorhynchidae	4	21
Pseudoacanthocephalidae	1	27
Rhadinorhynchidae	8	42