Acanthocephala (Spiny-headed Worms or Thorny-headed Worms)
Class: Archiacanthocephala
Order: Oligacanthorhynchida
Family: Oligacanthorhynchidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Pachysentis gethi | (Machado-Filho, 1950) | Geth's spiny-headed worm | (rediscovered) | Brazil (& Mexico?) | Rediscovered? | Access |
Class: Eoacanthocephala
–No subordinate taxa
Class: Palaeacanthocephala
–No subordinate taxa
Appendix 1: Possible future additions to this list
The species Acanthogyrus barmeshoori Amin et al., 2013 was described from specimens collected from the host fish Aphanius farsicus (Farsi tooth-carp) during July 2006-June 2007. The host species is now feared extinct in the wild (Esmaeili & Freyhof, 2014).
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Detailed Presentation
Class: Archiacanthocephala
Order: Apororhynchida (1 family: Apororhynchidae; 1 genus: Apororhynchus; 7 living species)
–No subordinate taxa
Order: Gigantorhynchida (1 family: Giganthorhynchidae; 2 genera: Gigantorhynchus, Mediorhynchus; 64 living species)
–No subordinate taxa
Order: Moniliformida (1 family: Moniliformidae; 3 genera: Australiformis, Moniliformis, Promoniliformis; 20 living species)
–No subordinate taxa
Order: Oligacanthorhynchida (1 family; 12 genera; 96 living species)
Family: Oligacanthorhynchidae
| Scientific Name | Author/s | Common Name | Last Record | Distribution | Status | Taxon Profile |
| Pachysentis gethi | (Machado-Filho, 1950) | Geth's spiny-headed worm | (rediscovered) | Brazil (& Mexico?) | Rediscovered? | Access |
Class: Eoacanthocephala
Order: Gyracanthocephala (1 family: Quadrigyridae; 9 genera; many living species)
–No subordinate taxa
Order: Neoechinorhynchida (3 families: Dendronucleatidae, Neoechinorhynchidae, Tenuisentidae; 20 genera; many living species)
–No subordinate taxa
Order: Polyacanthorhynchida (1 family: Polyacanthorhynchidae; 1 genus: Polyacanthorhynchus; 4 living species)
–No subordinate taxa
Class: Palaeacanthocephala
Order: Echinorhynchida (13 families; many genera; many living species)
–No subordinate taxa
Order: Heteramorphida (1 family: Pyrirhynchidae; 1 genus: Pyrirhynchus; 1 living species)
–No subordinate taxa
Order: Polymorphida (3 families: Centrorhynchidae, Plagiorhynchidae, Polymorphidae; 23 genera; many living species)
–No subordinate taxa
Statistics
| Conservation status | Number of taxa (in percentage) |
| Extinct | 0 |
| Missing | 0 |
| Extinct in the Wild | 0 |
| Possibly Extinct in the Wild | 0 |
| Globally Rediscovered | 0 |
| Rediscovered in the Wild | 0 |
| Hypothetical | 0 |
| Invalid | 0 |
| Erroneously listed | 0 |
| Uncertain status | 1 (100%) |
| Total | 1 |