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Psammosteida also
called as
Psammosteoidei is a
suborder of
pteraspidid heterostracan agnathans. The
psammosteids had broad,
flattened bodies, suggesting...
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Semipodolaspis Protopteraspididae Protopteraspis Doryaspis Escharaspis Miltaspis Stegobranchiaspis Unkaraspis "Trygonaspis"
Psammosteida Pteraspidoidei...
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treated as a suborder, "Psammosteoidei", or as an order-level
taxon as "
Psammosteida", or as a family, "Psammosteidae". Anatomically, a
typical psammosteid...
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Psammosteidae is now
regarded as a
separate subtaxon within Pteraspidiformes, "
Psammosteida," as the
sister taxon of the most
basal family, Anchipteraspidae. Pteraspididae...
- to psammosteids, some authorities, such as Tarlo,
place them
within Psammosteida.
Because the
ornamentation on the
plates and
scales are very similar...
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belongs to the
clade Drepanaspididae, a
subdivision of the
family Psammosteida.
Psammosteida belongs to the
order Pteraspidiformes and
class Pteraspidomorphi...
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thought to
represent a
transitional form
between the
Pteraspididae and the
Psammosteida,
bearing the
broad head
shield shape of the latter, due to a more benthic...
- †Pteraspidomorpha Subclass: †Heterostraci Order: †Pteraspidiformes Suborder: †
Psammosteida Family: †Psammosteidae
Genera Drepanaspis Psammosteus Pycnosteus Schizosteus...
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Semipodolaspis Protopteraspididae Protopteraspis Doryaspis Escharaspis Miltaspis Stegobranchiaspis Unkaraspis "Trygonaspis"
Psammosteida Pteraspidoidei...
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Semipodolaspis Protopteraspididae Protopteraspis Doryaspis Escharaspis Miltaspis Stegobranchiaspis Unkaraspis "Trygonaspis"
Psammosteida Pteraspidoidei...
