-
Placoderms (from
Ancient Gr**** πλάξ [plax, plakos] 'plate' and δέρμα [derma] 'skin') are
vertebrate animals of the
class Placodermi, an
extinct group of...
- and
cartilaginous fishes, as well as
extinct prehistoric fish such as
placoderms and acanthodians. Most
gnathostomes have
retained ancestral traits like...
-
lepis 'scale') was a widespread,
abundant and
diverse genus of
antiarch placoderms that
lived during the
Middle to Late
Devonian period of the Paleozoic...
-
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)...
-
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...
-
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...
-
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...
-
class Placodermi.
Recent studies indicate that
Osteichthyes evolved from
placoderms like Entelognathus,
while acanthodians are more
closely related to modern...
-
vertebrate eye. Many of the
oldest fossil vertebrates,
including ostracoderms,
placoderms, crossopterygians, and
early tetrapods, have in
their skulls sockets that...
- 'berry' and Gr****: ὀστέον ostéon 'bone') is an
extinct genus of
arthrodire placoderm from the
Devonian period. Its
fossils have been
found throughout Europe...
