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 fast start: Evidence of rapid growth in Trialestes romeri, an early Crocodylomorpha from the Upper Triassic continental beds of Argentina based on osteohistological analyses
Journal of Anatomy,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 31, 2025
The
palaeobiology
aspects
of
early
Crocodylomorpha
during
their
origin
in
the
Triassic
are
poorly
known,
despite
occupying
an
important
palaeoecological
role
continental
environments.
In
this
study,
we
report
microstructural
features
appendicular
bones
two
specimens
Trialestes
romeri,
a
non-Crocodyliformes
from
Upper
NW
Argentina.
Our
goals
to
infer
life
history
(i.e.
age
estimation
and
maturity
events),
inter-elemental
variation
growth
dynamics
within
phylogenetic
framework.
samples
include
humerus
ulna
holotype
(PVL
2561)
femur
referred
specimen
3889).
All
elements
mostly
composed
by
fibrolamellar
complex
with
variable
distribution
parallel-fibred
bone
cortex.
Furthermore,
they
possess
uniform
homogeneous
vascularisation,
formed
mainly
laminar
pattern.
PVL
2561
records
lines
arrested
(LAGs)
no
cyclical
marks
were
registered
ulna.
Meanwhile,
3889
exhibit
single
LAG.
Hence,
slight
disparate
is
reported
both
individuals.
absence
external
fundamental
system
(EFS)
homogenous
matrix
vascularisation
suggest
that
did
not
attain
sexual
somatic
maturity.
Overall,
histological
T.
romeri
indicate
rapid
rate
just
like
other
crocodylomorphs
(Terrestrisuchus,
Saltoposuchus),
whereas
others
rather
moderate
(Crocodylomorpha
indet.
BP/1/8484
specimen)
or
slower
(Hesperosuchus)
rate.
These
findings
reveal
rates
widely
present
among
occurrence
evolutionary
might
it
plesiomorphic
condition.
Language: Английский
On the inference of red blood cell size from fossils
The Anatomical Record,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Feb. 13, 2025
Language: Английский
Pseudosuchia: Masters of survival and diversification
The Anatomical Record,
Journal Year:
2024,
Volume and Issue:
308(2), P. 238 - 244
Published: Dec. 13, 2024
Abstract
In
the
context
of
an
increasing
interest
for
Pseudosuchia,
we
have
compiled
a
Special
Issue,
comprising
14
collaborative
studies
that
deepen
our
understanding
pseudosuchian
evolution.
These
contributions
range
from
description
new
taxon
to
exhaustive
reviews
thermometabolism,
morphological
adaptation,
systematics,
and
detailed
investigations
into
ontogeny,
paleoneurology,
paleohistology,
paleobiology.
Through
these
papers,
explore
evolutionary
history
archosaurs,
spotlighting
their
rise
diversification
following
end‐Permian
mass
extinction.
Language: Английский