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Placoderms (from
Ancient Gr**** πλάξ (plax, plakos) 'plate' and δέρμα (derma) 'skin') are
vertebrate animals of the
class Placodermi, an
extinct group of...
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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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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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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...
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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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including all
living cartilaginous and bony fish, as well as the
extinct placoderms and acanthodians. In a
break to the long
tradition of
grouping all fish...
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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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during the
Silurian was the
diversification of
jawed fish,
which include placoderms,
acanthodians (which gave rise to
cartilaginous fish) and osteichthyan...
- (/æliˌiːnəˈkænθəs/) (meaning "alien spine") is a
genus of
selenosteid placoderm from the
Famennian Ostrówka
Quarry in the Świętokrzyskie Mountains, Poland...
- 'berry' and Gr****: ὀστέον ostéon 'bone') is an
extinct genus of
arthrodire placoderm from the
Devonian period. Its
fossils have been
found throughout Europe...
