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Psammosteidae is an
extinct family of flattened,
benthic heterostracan vertebrates that
lived in
marine and
estuary environments in Europe,
Russia & North...
- Mark-Kurik, E.Yu.,
Psammosteidy (Agnatha,
Psammosteidae)
devona SSSR (Psammosteids (Agnatha,
Psammosteidae) from the
Devonian of the USSR), Tallinn: Inst...
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Pycnolepis Pycnosteidae Tartuosteus Pycnosteus Psammolepididae Psammosteus Psammosteidae Crenosteus Elgaia Karelosteus Osteoplax Placosteus Psammosteus Psarkosteus...
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Pycnolepis Pycnosteidae Tartuosteus Pycnosteus Psammolepididae Psammosteus Psammosteidae Crenosteus Elgaia Karelosteus Osteoplax Placosteus Psammosteus Psarkosteus...
- "Psammosteoidei", or as an order-level
taxon as "Psammosteida", or as a family, "
Psammosteidae". Anatomically, a
typical psammosteid resembles a
typical pteraspidid...
-
Pycnolepis Pycnosteidae Tartuosteus Pycnosteus Psammolepididae Psammosteus Psammosteidae Crenosteus Elgaia Karelosteus Osteoplax Placosteus Psammosteus Psarkosteus...
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grandis is
estimated to have
length over 50 cm (1.6 ft). Some
members of
Psammosteidae such as
Obruchevia and
Tartuosteus are
estimated to
reached up to 2 m...
-
Pycnolepis Pycnosteidae Tartuosteus Pycnosteus Psammolepididae Psammosteus Psammosteidae Crenosteus Elgaia Karelosteus Osteoplax Placosteus Psammosteus Psarkosteus...
-
Pycnolepis Pycnosteidae Tartuosteus Pycnosteus Psammolepididae Psammosteus Psammosteidae Crenosteus Elgaia Karelosteus Osteoplax Placosteus Psammosteus Psarkosteus...
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paraphyletic within Pteraspidiformes, and thus, no
longer valid,
while Psammosteidae is now
regarded as a
separate subtaxon within Pteraspidiformes, "Psammosteida...
