Pseudosuchian thermometabolism: A review of the past two decades
The Anatomical Record,
Journal Year:
2024,
Volume and Issue:
308(2), P. 315 - 341
Published: Dec. 16, 2024
Abstract
Pseudosuchia,
one
of
the
two
main
clades
Archosauria,
is
today
only
represented
by
some
20
extant
species,
crocodilians,
representing
a
fraction
its
extinct
diversity.
Extant
crocodilians
are
ectotherms
but
present
morphological
and
anatomical
features
usually
associated
with
endothermy.
In
2004,
it
was
proposed
that
pseudosuchians
were
ancestrally
endothermic
observed
in
remains
this
lost
legacy.
This
contribution
has
parts:
first
part
covers
years
studies
on
subject,
exploring
evidence
for
loss
endothermy
before
covering
variety
proxies
used
to
infer
thermophymetabolic
regime
pseudosuchians.
second
part,
quantitative
results
these
previous
integrated
into
comprehensive
ancestral
state
reconstruction
discuss
potential
scenario
evolution
thermometabolism.
Pseudosuchian
would
then
have
been
close
node
Crocodylomorpha.
The
end‐Triassic
mass
extinction
played
role
filter,
leading
survival
ectothermic
ones.
difference
Pseudosuchia
compared
those
dinosaurs,
their
metabolism
also
considered.
might
different
level
than
dinosaurian
more
expected
clarify
question.
Language: Английский
A re-description of the teleosauroid Macrospondylus bollensis (Jaeger, 1828) from the Posidonienschiefer Formation of Germany
PalZ,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 5, 2025
Language: Английский
Functional and phylogenetic signals in the pectoral girdle of Thalattosuchia and Dyrosauridae (Crocodylomorpha)
The Anatomical Record,
Journal Year:
2024,
Volume and Issue:
308(2), P. 412 - 573
Published: Nov. 25, 2024
Abstract
Crocodylomorphs
have
colonized
various
environments
from
fully
terrestrial
to
aquatic,
making
it
an
important
clade
among
archosaurs.
A
remarkable
example
of
the
rich
past
diversity
Crocodylomorpha
Hay,
1930
is
marine
colonization
undergone
by
several
crocodylomorph
lineages,
particularly
Thalattosuchia
Fraas,
1901
during
Early
Jurassic–Early
Cretaceous,
and
Dyrosauridae
de
Stefano,
1903
Late
Cretaceous–Early
Eocene.
represents
most
impressive
singular
radiation
Crocodylomorpha,
occupying
ecological
niches,
before
enigmatically
disappearing
in
Cretaceous.
Dyrosauridae,
on
other
hand,
known
for
surviving
end‐Cretaceous
mass
extinction
abundance
but
subsequently
vanished.
The
evolutionary
path
undertaken
crocodylomorphs
into
aquatic
reasons
their
disappearance
outside
events
Mesozoic
remains
a
mystery.
Despite
well‐preserved
fossil
record,
attention
has
primarily
centered
craniodental
adaptations,
overlooking
swimming‐related
adaptations
recorded
postcranial
skeleton.
This
research
involves
comprehensive
examination
pectoral
girdle
representative
members
highlighting
trajectories
over
time.
Additionally,
this
work
aims
test
phylogenetic
signal
residing
anatomy
Crocodylomorpha.
As
such,
recent
complete
dataset
been
repurposed:
42
new
characters
added
others
revised
address
our
question.
We
stress
that
constitutes
tool
supply
better
understand
relations
extinct
crocodyliforms,
also
offers
insights
development,
ecology,
biomechanics.
Language: Английский
The internal braincase anatomy of Thalattosuchus superciliosus – with implications for the endocranial evolution of metriorhynchid crocodylomorphs
Historical Biology,
Journal Year:
2024,
Volume and Issue:
unknown, P. 1 - 12
Published: Nov. 29, 2024
Thalattosuchian
crocodylomorphs
underwent
a
major
evolutionary
transition,
evolving
from
semiaquatic
forms
reminiscent
of
extant
crocodylians,
into
pelagic
marine
with
flippers,
tail
fin
and
smooth
scaleless
skin.
These
fully
aquatic
–
the
Metriorhynchidae
evolved
novel
suite
endocranial
anatomies
hypothesised
to
be
related
living
in
saltwater.
However,
much
remains
discovered
about
evolution
these
internal
braincase
structures.
Herein,
we
describe
anatomy
an
early
diverging
metriorhynchid,
Thalattosuchus
superciliosus,
using
microfocus
computed
tomography
(μCT)
data
three-dimensional
modelling.
We
compared
it
against
geosaurine
metriorhynchine
metriorhynchids,
as
well
metriorhynchoid
Pelagosaurus.
found
that
non-geosaurine
metriorhynchids
differ
geosaurines
having
less
laterally
expanded
cerebral
hemispheres,
shallower
curvatures
brain's
dorsal
margin,
lacking
ventral
deflection
pneumatic
diverticulum
pituitary
fossa
chamber.
early-diverging
have
well-defined
otoccipital
diverticula
lacked
'extreme
pelagic'
endosseous
labyrinth
morphology.
hypothesise
were
not
adapted
sustained
pursuit
lifestyle.
Moreover,
posit
within
both
metriorhynchid
subfamilies
there
was
parallel
towards
becoming
predators.
Language: Английский