As of 2004, the following species were considered valid:
As generally recognized, the following species belong in Aceros:
Santa Cruz County is home to the following endangered species:
Although the taxonomy of the genus has not been reviewed since 1955, the following species are recognised:
As generally recognized, the following species belong in the genus Rhyticeros:
Monterey County has habitat to support the following endangered species:
It contains at least the following species :
The genus contains at least the following species:
Up to 2004 the following species had occurred:
The taxonomy of the group is unclear, it contains at least the following species:
