Syngenochilus radiapex

Syngenochilus radiapex is an extinct species of sea snail, a marine gastropod mollusc, in the superfamily Conoidea, currently unassigned to a family. Dating to the early Oligocene to the early Miocene, fossils of the species have been found in the Otway Basin and Port Phillip Basin of Victoria, Australia.

Description

In the original description, Powell described the species as follows:
The species has a protoconch with a flat first whorl, and the axial sculpture noted by Powell appears to disappear with age. The holotype measured in height and in diameter, but likely is of a specimen that had not fully grown. Other specimens have been identified with heights ranging between, and diameters of between.

Taxonomy

The species was first described by A. W. B. Powell in 1944 as the type species of the genus Syngenochilus, also described in the same paper. The holotype is held by the Auckland War Memorial Museum.

Distribution

S. radiapex is found in fossil beds of the Otway Basin and Port Phillip Basin in Victoria, Australia, including the Glen Aire Clay, Jan Juc formation, Puebla Formation and Bird Rock Cliffs, Torquay. Fossils of this species have been dated to between the early Oligocene to the early Miocene.