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Placoderms (from Gr**** πλάξ (plax, plakos) 'plate' and δέρμα (derma) 'skin') are
members of the
class Placodermi, a
group of
prehistoric fish
known from...
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thought to have
lacked pectoral or
pelvic fins. In
addition to this, some
placoderms (extinct fish with bony plates) were
shown to have a
third pair of paired...
- This list of
placoderms is an
attempt to
create a
comprehensive listing of all
genera from the
fossil record that have ever been
considered to be members...
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Dunkleosteus consists of ten species, some of
which are
among the
largest placoderms ("plate-skinned") to have ever lived: D. terrelli, D. belgicus, D. denisoni...
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record from the
Silurian by two
groups of fish: the
armoured fish
known as
placoderms,
which evolved from the ostracoderms; and the
Acanthodii (or
spiny sharks)...
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characteristics are
considered homologous characteristics derived from
common placoderm ancestors[clarification needed], and
present also in
basal cartilaginous...
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connection between the
teeth and the
original dermal scales. The old
placoderms did not have
teeth at all, but had
sharp bony
plates in
their mouth. Thus...
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Actinolepis is an
extinct genus of
actinolepid placoderm from the
Early Devonian. Four
species are known: A.
magna from Estonia, A.
spinosa from Latvia...
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lepis 'scale') was a widespread,
abundant and
diverse genus of
antiarch placoderms that
lived during the
Middle to Late
Devonian period of the Paleozoic...
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including all
living cartilaginous and bony fish, as well as the
extinct placoderms and acanthodians. Most fish are cold-blooded,
their body
temperature varying...
