Phallocephale is a monospecific genus of ovoviviparous velvet worm containing the single species Phallocephale tallagandensis.

Males are distinguished by the presence of an eversible knoblike structure on the head, whereas females instead have a depression on their head.

The type locality of this species is Tallaganda National Park, New South Wales, Australia.

[2] The name of the genus is derived from the Greek phallos (meaning penis) and kephale (meaning head), referring to the structure present on the heads of males of this species.

The specific epithet refers to Tallaganda National Park, where this species was discovered.