Revision of the Frasnian Late Devonian conodont genus Ancyrodella

This paper revises all the species of the Frasnian Late Devonian genus Ancyrodella. Seventeen species are recognized, as well as several intraspecific morphotypes not considered separate species. Illustrated specimens are all from collections from the Canning Basin, Western Australia, but publications of global Devonian tropical localities are also reviewed in the synonymies. The taxonomic approach herein is one using the controversial "vertical chronospecies" based primarily on the Pa elements ' platform outline and the pattern of secondary carinae and keels, if present. Multielement reconstructions have been few. In view of the widespread confusion and variable application of species names, zonations based on the succession of Ancyrodella species appear premature.