Ontogenetic and interelemental study of appendicular bones of Caiman latirostris Daudin, 1802 sheds light on osteohistological variability in crocodylians
Journal of Morphology,
Journal Year:
2024,
Volume and Issue:
285(4)
Published: April 1, 2024
Abstract
The
osteohistology
of
vertebrates
provides
a
reliable
source
to
deduce
biological
information,
particularly
regarding
growth
and
development.
Although
osteohistological
studies
in
Neosuchia
(Crocodyliformes,
Mesoeucrocodylia)
are
relatively
numerous,
the
number
species
studied
within
group
is
still
small.
Extant
crocodilians
known
exhibit
intraspecific
variability
linked
environmental
conditions,
habitat,
feeding,
other
intrapopulation
factors.
Here,
we
analyzed
living
South
American
Caiman
latirostris
throughout
posthatching
ontogeny.
histology
several
appendicular
bones
13
different‐sized
captive
wild
individuals
were
examined.
some
thin
sections
revealed
classic
lamellar,
parallel‐fibered,
or
woven
bone
matrices,
others
showed
variation
mix
between
organization
tissue.
These
histological
differences
likely
related
dynamics
caimans.
In
juveniles
studied,
remnants
embryonic
observed.
Osteohistological
prevailing
conditions
documented.
Furthermore,
our
results
show
ontogenetic
type
tissues
deposited
development
C.
.
This
study
offers
broad
framework
for
life
history
interpretations
insight
into
evolutionary
extinct
crocodylian
lineages.
Language: Английский
Origins of slow growth on the crocodilian stem lineage
Current Biology,
Journal Year:
2023,
Volume and Issue:
33(19), P. 4261 - 4268.e3
Published: Sept. 15, 2023
Language: Английский
New data on the bone histology of Araripesuchus buitreraensis (Crocodylomorpha: Notosuchia) from the Late Cretaceous of Argentinean Patagonia
Historical Biology,
Journal Year:
2024,
Volume and Issue:
37(2), P. 293 - 303
Published: Jan. 10, 2024
Araripesuchus
is
a
genus
of
Notosuchia
from
the
Upper
Cretaceous
southern
continents.
A
previous
paleohistological
study
performed
in
individuals
assigned
to
one
South
American
species
(Araripesuchus
buitreraensis)
has
revealed,
among
other
palaeobiological
inferences,
cyclical
and
slow
growth
dynamics.
To
increase
knowledge
about
dynamics
intraskeletal
interspecific
histological
variation,
here
we
analyse
microstructure
femur,
tibia,
fibula,
metatarsal
(II,
III
IV)
two
osteoderms
an
individual
referred
cf.buitreraensis
(MPCA-Pv
263)
Late
Argentina.
All
elements
present
cortex
formed
by
both
parallel
fibred
lamellar
bone
tissues
interrupted
lines
arrested
(LAGs),
revealing
general
rate
annually
interrupted.
similar
strategy
been
inferred
for
notosuchians,
as
Iberosuchus
macrodon,
but
important
variation
regarding
this
parameter
evident
clade.
Although
tissue
suggests
that
reached
sexual
maturity
(i.e.
increasing
intrinsic
fibre
arrangement
outer
cortex),
absence
external
fundamental
system
indicates
somatic
maturation
not
attained.
MPCA-Pv
263
exhibit
discrete
layer
WFB
cortical
whose
origin
still
unambiguous.
Language: Английский
A review of the non‐semiaquatic adaptations of extinct crocodylomorphs throughout their fossil record
The Anatomical Record,
Journal Year:
2024,
Volume and Issue:
308(2), P. 266 - 314
Published: Nov. 25, 2024
Abstract
Crocodylomorphs
constitute
a
clade
of
archosaurs
that
have
thrived
since
the
Mesozoic
until
today
and
survived
numerous
major
biological
crises.
Contrary
to
historic
belief,
their
semiaquatic
extant
representatives
(crocodylians)
are
not
living
fossils,
and,
during
evolutionary
history,
crocodylomorphs
evolved
live
in
variety
environments.
This
review
aims
summarize
non‐semiaquatic
adaptations
(i.e.,
either
terrestrial
or
fully
aquatic)
different
groups
from
periods,
highlighting
how
exactly
those
lifestyles
inferred
for
animals,
with
regard
geographic
temporal
distribution
phylogenetic
relationships.
The
ancestral
condition
Crocodylomorpha
seems
been
lifestyle,
linked
several
morphological
such
as
an
altirostral
skull,
long
limbs
allowing
erect
posture
specialized
dentition
diets
based
on
land.
However,
some
members
this
clade,
thalattosuchians
dyrosaurids
display
opposite,
aquatic
interestingly
same
type
observations.
Finally,
new
techniques
inferring
paleobiology
extinct
animals
put
forward
last
decade,
appearing
complementary
approach
traditional
descriptions
comparisons.
Such
is
case
paleoneuroanatomical
(CT
scan
data),
histological,
geochemical
studies.
Language: Английский
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
Life history and growth dynamics of a peirosaurid crocodylomorph (Mesoeucrocodylia; Notosuchia) from the Late Cretaceous of Argentina inferred from its bone histology
Journal of Anatomy,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 23, 2025
Abstract
Notosuchia
were
a
successful
lineage
of
Crocodyliformes
that
achieved
remarkable
diversity
during
the
Cretaceous
Gondwana,
particularly
in
South
America.
Although
paleohistology
has
expanded
our
knowledge
paleobiology
notosuchians,
several
clades
this
remain
poorly
understood
aspect.
Here
we
help
to
address
gap
by
conducting
first
histological
analysis
appendicular
bones
peirosaurid.
To
increase
about
growth
dynamics
and
examine
intraeskeletal
interspecific
variation,
analyze
microstructure
tibia,
fibula,
phalanx,
fragment
ornamented
element
(possible
osteoderm
or
skull
bone)
possible
long
bone
an
individual
assigned
Peirosauridae
indet.
(MAU‐Pv‐437).
The
peirosaurid
studied
here
appears
have
reached
sexual
but
not
somatic
maturity
minimum
age
inferred
from
results
lower
estimated
than
osteoderms
previous
study
on
same
individual.
cortical
MAU‐Pv
437
is
formed
vascularized
parallel
fibered
bone/lamellar
which
indicates
experienced
moderate
rate.
This
different
what
been
observed
for
other
notosuchians
specimens,
suggesting
lack
uniform
pattern
clade.
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