Cranial osteology and paleoneurology of Tarjadia ruthae: An erpetosuchid pseudosuchian from the Triassic Chañares Formation (late Ladinian‐?early Carnian) of Argentina
The Anatomical Record,
Год журнала:
2024,
Номер
307(4), С. 890 - 924
Опубликована: Янв. 23, 2024
Abstract
Tarjadia
ruthae
is
a
quadrupedal
terrestrial
pseudosuchian
from
the
Middle‐early
Upper
Triassic
of
Chañares
Formation,
La
Rioja
Province,
Argentina.
Originally,
this
species
was
identified
as
an
indeterminate
archosaur
and
later
doswelliid
archosauriform
based
on
very
fragmentary
specimens
characterized
by
ornamentation
skull
roof
osteoderms.
Additional
(including
skulls
postcrania)
recovered
in
last
decade
show
that
erpetosuchid,
enigmatic
group
composed
six
registered
Middle‐Upper
continental
units
Tanzania,
Germany,
Scotland,
North
America,
Brazil,
Argentina
Parringtonia
gracilis
Tanzania
are
best
preserved
more
abundant
species.
Although
monophyly
Erpetosuchidae
well
supported,
alternative
high‐level
positions
within
Archosauria
have
been
suggested,
such
sister
taxon
to
Crocodylomorpha,
Aetosauria,
or
Ornithosuchidae.
In
order
improve
knowledge
about
erpetosuchids,
we
performed
detailed
description
paleoneurological
reconstruction
,
two
articulated
partial
(CRILAR‐Pv
478
CRILAR‐Pv
495)
other
specimens.
We
analyzed
stratigraphic
geographic
occurrence
historical
new
provided
emended
diagnosis
(the
same
for
genus
species,
due
monotypy)
along
with
comparative
cranial
endocast.
The
robust,
thick
strongly
ornamented
roof,
triangular
dorsal
view,
concave
lateral
margins
at
mid‐length
form
abrupt
widened
posterior
region.
external
nares
smallest
openings
skull.
antorbital
fossa
deeply
excavated
has
small
heart‐shaped
fenestra
both
lobes
pointing
anteriorly.
supratemporal
fenestrae
large
rounded
orbits,
infratemporal
L‐shaped
extensive
excavation
jugal,
quadratojugal
quadrate.
hemimandibles
low,
slightly
dentigerous
region
convex
region,
conferring
them
S‐shaped
profile
view.
mandibular
elliptic,
being
twice
longer
than
high.
maxillary
dentition
restricted
anterior
mid
rostrum.
Since
braincase
partially
damaged,
surface
brain
could
not
be
entirely
reconstructed.
As
result,
endocast
anteroposteriorly
elongated
seemingly
flat,
cephalic
flexure
seems
lower
expected
suchian.
labyrinth
wider
high,
semicircular
canals
remarkably
straight,
canal
one.
Язык: Английский
The dawn of an Era: New contributions on comparative and functional anatomy of Triassic tetrapods
The Anatomical Record,
Год журнала:
2024,
Номер
307(4), С. 713 - 721
Опубликована: Фев. 12, 2024
Abstract
The
Triassic
period
stands
as
a
crucial
moment
for
understanding
tetrapod
evolution,
marking
the
emergence
and
early
diversification
of
numerous
lineages
that
persist
in
today's
ecosystems.
Birds,
crocodiles,
testudines,
lizards,
mammals
can
all
trace
their
origins
to
Triassic,
which
is
distinguished
by
several
adaptive
radiation
events
fostered
unparalleled
diversity
body
plans
lifestyles.
Beyond
this
macroevolutionary
significance,
serves
fertile
ground
scientific
inquiry,
especially
studies.
aim
Special
Issue
assemble
diverse
array
new
contributions
focused
on
continental
tetrapods
globally,
encouraging
collaboration
among
researchers
across
generations,
pooling
efforts
comprehend
pivotal
evolutionary
history.
This
issue
encompasses
almost
40
varied
contributions,
spanning
topics
from
comparative
functional
anatomy,
including
descriptions
novel
taxa,
comprehensive
anatomical
reviews,
systematic
investigations,
phylogenetic
analyses,
paleoneurological
studies,
biomechanical
assessments,
detailed
examinations
histology
ontogeny.
Collectively,
offers
an
extensive
exploration
anatomical,
ecological,
perspectives,
unveiling
fresh
insights
into
intriguing
vertebrate
Язык: Английский
The first ontogenetic model for non‐crocodylomorph loricatans, based on osteohistology of the ontogenetic series of Prestosuchus chiniquensis from the Middle Triassic of Brazil
The Anatomical Record,
Год журнала:
2024,
Номер
308(2), С. 598 - 628
Опубликована: Ноя. 20, 2024
Abstract
Prestosuchus
chiniquensis
is
an
iconic
non‐crocodylomorph
loricatan
from
the
Brazilian
Triassic
beds
and
best‐known
taxon,
represented
by
several
specimens.
The
completeness
preservation
of
its
skeleton
make
it
a
valuable
taxon
for
paleobiological
studies.
We
explore
microstructure
bone
tissues
appendicular
elements
ribs
three
specimens
to
access
variety
aspects
paleobiology,
such
as
histovariability,
ontogeny,
growth
patterns.
Integrating
our
data
other
osteohistologically
studied
P.
specimens,
we
proposed
first
time
ontogenetic
model
loricatans.
encompasses
six
distinct
age
classes
(I–VI)
that
allow
us
infer
patterns
possibly
expand
phylogenetically
close
taxa.
During
early
ontogeny
(age
I–II),
sustained
fast
was
maintained
fibrolamellar
complex.
In
mid
III–IV),
highly
vascularized
parallel‐fibered
predominates,
suggesting
intermediary
rates.
A
change
poorly
parallel‐fibered/lamellar
would
mark
attainment
sexual
IV–V)
skeletal
maturity,
comprising
class
VI.
An
external
fundamental
system
(EFS)
present
in
outermost
cortex
main
histological
feature
characterize
Major
histovariability
features
are
between
bones
skeletally
immature
individuals.
most
prominent
them
presence
complex
ribs.
advanced
stages,
tends
be
minor.
Our
also
support
previous
hypothesis
one
new
among
assigned
,
increasing
diversity
specimen
UFRGS‐PV‐0152‐T,
awaits
formal
anatomical
description.
study
advances
preliminary
understand
non‐crocodylomorphs
loricatans
Pseudosuchia
whole.
Язык: Английский
Sampling and collector biases as taphonomic filters: an overview
Anais da Academia Brasileira de Ciências,
Год журнала:
2024,
Номер
96(4)
Опубликована: Янв. 1, 2024
Sampling
(or
sample)
bias
is
a
widespread
concern
in
scientific
research,
across
several
disciplines.
The
concept
of
sampling
originated
statistical
studies.
consequence
biased
sample
that
scientists
will
conclude
about
population
different
from
their
target.
In
paleontology,
typically
related
to
fieldwork
context.
Human
factors,
known
as
sullegic
(e.g.
collection
method,
historic
resampling)
and
trephic
(transport,
curatorial
processes)
factors
can
generate
bias.
Other
factor
the
ugly
fossil
syndrome
(i.e.
choosing
based
on
completeness
specimens,
or
according
researcher
interest).
Thus,
implies
information
loss.
Biased
samples
add
artificial
results
be
considered
an
additional
taphonomic
filter.
Therefore,
collector
role
choices
are
frequently
linked
almost
indistinguishable.
Compared
treatment
this
topic
other
research
fields,
little
discussion
has
been
held
vertebrate
especially
regarding
what
happens
at
interface
between
biosphere,
lithosphere,
anthroposphere,
during
transition
anthroposphere
patrisphere
(museums).
Numerous
questions
still
arise.
As
community,
we
must
pay
attention,
minimize
loss
information,
field
activities
cataloging.
Язык: Английский