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Ostracodermi (lit. 's****-skins') or
ostracoderms is an
unofficial clade of
vertebrate animals that
include all
armored jawless fish of the
Paleozoic Era...
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jawless fish
called the conodonts, and
small mostly armoured fish
known as
ostracoderms,
first appeared. Most
jawless fish are now extinct; but the
extant lampreys...
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vertebrates or, at any rate, for the
ensemble of all
ostracoderms and the gnathostomes.
Other ostracoderms, such as the
Galeaspida are now
known to have a...
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earliest fish with
dedicated respiratory gills and
paired fins, the
ostracoderms, had
heavy bony
plates that
served as
protective exoskeletons against...
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corresponded to
sharp decline of
jawless fish such as
conodonts and
ostracoderms. The
Silurian system was
first identified by the
Scottish geologist Roderick...
- sunfish,
giant grouper and all the
other giant bony
fishes alive today.
Ostracoderm -
armoured jawless fish.
Prehistoric fish Zhao, W.; Zhang, X.; Jia, G...
- s****" [-i is pl. of -us]) is an
extinct subclass of pteraspidomorph,
ostracoderm,
jawless vertebrate that
lived primarily in
marine and
estuary environments...
- the
former group very
abundant (especially goniatites).
Trilobites and
ostracoderms decline,
while jawed fishes (placoderms, lobe-finned and ray-finned bony...
- the
species of fish it came from.
Scales originated within the
jawless ostracoderms,
ancestors to all
jawed fishes today. Most bony
fishes are
covered with...
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those days,
placoderms were
thought to be s****ed
jawless fish akin to
ostracoderms. Some
naturalists even
suggested that they were s****ed invertebrates...
