- the
various genera are
found in
early Devonian-aged
marine strata.
Protopteraspidids were once
thought to
represent a
taxon of
basal pteraspidids (hence...
-
marine strata of Nevada,
where it
coexisted sympatrically with the
protopteraspidid Lamiaspis, and
fellow protaspid Pirumaspis in a shallow-water marine...
- Pteraspidiformes, such as
Pteraspis and Errivaspis, though, some
protopteraspidids, such as
Doryaspis and Panamintaspis,
share various features with...
-
contains the more
derived taxa
within Pteraspidiformes, though, some
protopteraspidids, such as
Doryaspis and Panamintaspis,
share various features with...
