-
Cyathaspidida is a
taxon of
extinct cyathaspidiform heterostracan agnathans whose fossils are
found in
Silurian to
Lower Devonian marine strata of Europe...
- taxa.
Until recently,
there were
several families within the
suborder Cyathaspidida,
including Cyathaspididae, Irregularaspididae, Anglaspididae, Poraspididae...
- Nakaolinaspis？
Cyathaspidida Amphiaspidida...
- Nakaolinaspis？
Cyathaspidida Amphiaspidida...
- Nakaolinaspis？
Cyathaspidida Amphiaspidida...
- Nakaolinaspis？
Cyathaspidida Amphiaspidida...
-
grouped together with
their relative Ctenaspis of Canada), and the
Cyathaspidida (i.e., Cyathaspis, Poraspis, and Anglaspis),
grouped together with their...
- Nakaolinaspis？
Cyathaspidida Amphiaspidida...
- of
extinct cyathaspidiform heterostracan agnathans in the
suborder Cyathaspidida.
Family Ariaspidae contains Ariaspis, and its sister-taxa originally...
-
Chordata class:
Pteraspidomorphi Subclass:
Heterostraci Order:
Cyathaspidiformes Suborder:
Cyathaspidida Family:
Cyathaspidae Genus:
Poraspis Kiær, 1930...
