-
ptyctodontids did not, that the
armored plates and
scales of
holocephalians are made of dentine, and the
armored plates and
scales of
ptyctodontids were...
-
their skin,
while ptyctodontids do not; the
armoured plates and
scales of
holocephalians are made of dentine,
while those of
ptyctodontids are made of bone;...
- find
confirmed the
hypothesis that a sub-group of placoderms,
called ptyctodontids,
fertilized their eggs internally. Some
fishes that
fertilize their...
- Holoptychius's
pectoral fins were
placed high on the body.
Ptyctodontida The
ptyctodontids (beak-teeth) are an
extinct monotypic order of
unarmored placoderms...
- Materpiscis, a
ptyctodontid placoderm fish that is the
oldest vertebrate known to give live birth...
- 1977.
Placoderm interrelationships reconsidered in the
light of new
ptyctodontids from Gogo,
Western Australia.
Linnean Society of London,
Symposium Series...
- in the
light of new
ptyctodontids from Gogo
Western Australia. Linn. Soc. Symp.
Series 4: 123-198. Long, J.A. 1997.
Ptyctodontid fishes from the Late...
- from the side as
apposed from
other angles.
Other placoderms such as
ptyctodontid placoderms have
similarly shaped claspers. For example, the
clasper of...
- ago and
outside the gnathostomata.
Viviparity in
Incisoscutum and the
ptyctodontids show that
these placoderms were the
first K-strategists in relation...
-
Eczematolepis is an
extinct genus of
ptyctodontidan from the
Milwaukee Formation of Wisconsin.
Three species are known: E. fragilis, E.
pustulosus and...
