Juracanthocephalus
Juracanthocephalus is an extinct, monospecific genus of stem-group acanthocephalan that lived in the Jiulongshan Formation during the Callovian age of the Middle Jurassic,.
It shares features with both Seisonidea and Acanthocephala, suggesting they are sister groups, with Juracanthocephalus being a transitional form between the two.
The type and only species is Juracanthocephalus daohugouensis.