Endocranial anatomy and phylogenetic position of the crocodylian Eosuchus lerichei from the late Paleocene of northwestern Europe and potential adaptations for transoceanic dispersal in gavialoids
The Anatomical Record,
Год журнала:
2024,
Номер
308(2), С. 636 - 670
Опубликована: Сен. 3, 2024
Abstract
Eosuchus
lerichei
is
a
gavialoid
crocodylian
from
late
Paleocene
marine
deposits
of
northwestern
Europe,
known
skull
and
lower
jaws,
as
well
postcrania.
Its
sister
taxon
relationship
with
the
approximately
contemporaneous
species
minor
east
coast
USA
has
been
explained
through
transoceanic
dispersal,
indicating
capability
for
salt
excretion
that
absent
in
extant
gavialoids.
However,
there
currently
no
anatomical
evidence
to
support
adaptation
extinct
Furthermore,
placement
within
Gavialoidea
labile,
some
analyses
supporting
affinities
Late
Cretaceous
early
Paleogene
“thoracosaurs.”
Here
we
present
novel
data
on
internal
external
anatomy
E.
enables
revised
diagnosis,
6
autapormorphies
identified
genus
10
features
enable
differentiation
.
Our
phylogenetic
recover
an
diverging
gavialid
not
part
“thoracosaur”
group.
In
addition
thickened
semi‐circular
canal
walls
endosseous
labyrinth
paratympanic
sinus
reduction,
identify
potential
osteological
correlates
glands
surface
prefrontal
lacrimal
bones
These
potentially
provide
dispersal
,
also
them
Portugalosuchus
Given
earliest
stratigraphically
oldest
gavialoids
either
have
nasal
gland
and/or
recovered
deposits,
this
suggests
capacity
might
be
ancestral
Gavialoidea.
Mapping
geological
onto
phylogeny
indicates
was
probably
more
than
one
independent
loss/reduction
Язык: Английский
The neuroanatomy and pneumaticity of Hamadasuchus (Crocodylomorpha, Peirosauridae) from the Cretaceous of Morocco and its paleoecological significance for altirostral forms
Journal of Anatomy,
Год журнала:
2023,
Номер
243(3), С. 374 - 393
Опубликована: Июнь 13, 2023
We
describe
the
endocranial
structures
of
Hamadasuchus,
a
peirosaurid
crocodylomorph
from
late
Albian-Cenomanian
Kem
group
Morocco.
The
cranial
endocast,
associated
nerves
and
arteries,
endosseous
labyrinths,
pneumatization,
as
well
bones
braincase
new
specimen,
are
reconstructed
compared
with
extant
fossil
crocodylomorphs,
which
represent
different
lifestyles.
Cranial
this
specimen
identified
belonging
to
close
affinities
Rukwasuchus
yajabalijekundu,
another
'middle'
Cretaceous
Tanzania.
comparable
those
R.
yajabalijekundu
but
also
baurusuchids
sebecids
(sebecosuchians).
Paleobiological
traits
such
alert
head
posture,
ecology,
behavior
explored
for
first
time,
using
quantitative
metrics.
expanded
narrow
semi-circular
canals
enlarged
pneumatization
skull
Hamadasuchus
linked
terrestrial
lifestyle.
Continuing
work
on
neuroanatomy
supposedly
crocodylomorphs
needs
be
broadened
other
groups
will
allow
characterize
whether
some
internal
affected
by
lifestyle
these
organisms.
Язык: Английский
Evaluation of the endocranial anatomy of the early Paleogene north African gavialoid crocodylian Argochampsa krebsi and evolutionary implications for adaptation to salinity tolerance in marine crocodyliforms
Journal of Anatomy,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 15, 2025
Abstract
Argochampsa
krebsi
is
a
gavialoid
crocodylian
from
the
early
Paleogene
of
North
Africa.
Based
on
its
recovered
phylogenetic
relationship
with
South
American
species,
it
has
been
inferred
to
have
capable
transoceanic
dispersal,
but
potential
anatomical
correlates
for
marine
lifestyle
yet
be
identified.
CT
scans
mostly
complete
and
well‐preserved
skull,
we
reconstruct
endocranial
anatomy
compare
that
other
gavialoids.
We
demonstrate
possesses
concave
depressions
internal
surface
prefrontals
lacrimals,
which
represent
osteological
salt
glands
in
unequivocally
metriorhynchoid
thalattosuchian
crocodyliforms.
The
presence
these
suggests
likely
frequented
pelagic
environments
provides
additional
support
capability
dispersal
within
Gavialoidea.
also
newly
interpret
Miocene
north
African
Sutekhsuchus
dowsoni
,
providing
further
saltwater
tolerance
was
widespread
possibly
ancestral
Gavialoidea,
given
they
previously
reported
Late
Cretaceous–early
species
Eosuchus
lerichei
Portugalosuchus
azenhae
.
In
addition
gavialoids,
as
well
metriorhynchids,
identify
gland
Paleocene
northwest
dyrosaurid
Rhabdognathus
aslerensis
represents
another
crocodyliform
lineage
thought
dispersal.
Given
dyrosaurids,
metriorhynchoids
are
distantly
related
lineages,
evolution
convergent
ecological
adaptation
occupation
environments.
Nevertheless,
limited
evaluation
across
Crocodyliformes,
including
most
extant
such
remains
possible
much
more
widespread.
Язык: Английский
Giant longirostrine crocodylians from the Lower Miocene of Pakistan: new material and taxonomic review
Papers in Palaeontology,
Год журнала:
2025,
Номер
11(3)
Опубликована: Май 1, 2025
Abstract
This
study,
based
on
previously
undescribed
crocodylian
remains
from
the
Lower
Miocene
of
Bugti
Hills
(Balochistan,
Pakistan),
identifies
at
least
three
distinct
species.
It
confirms
validity
species
initially
identified
as
‘
Gavialis
’
pachyrhynchus
,
establishing
it
sister
taxon
to
massive
Rhamphosuchus
crassidens
.
Consequently,
is
reclassified
Additionally,
Gharialis
curvirostris
now
acknowledged
a
valid
under
new
genus
name
Pseudogavialis
closely
related
Another
set
represents
third
species,
although
poor
preservation
hinders
precise
identification.
The
phylogenetic
relationship
between
Tomistoma
and
one
most
debated
issues
in
phylogeny.
Molecular
analyses
suggest
sister‐taxa
dating
back
Early
Miocene,
while
morphological
place
base
tree,
diverging
‘thoracosaurs’,
with
Gavialoidea–Crocodyloidea
split
Cretaceous.
inclusion
newly
described
yields
variable
outcomes,
highlighting
sensitivity
results
considered.
insertion
Portugalosuchus
azenhae
found
‘thoracosaur’,
aligns
traditional
findings,
Indo‐Pakistani
supports
molecular
hypothesis.
Nevertheless,
large
number
gavialoids
‘thoracosaurs’
makes
result
strongly
stratigraphically
incongruent.
fossil
significantly
impacts
our
understanding
relationships.
Even
when
align
data,
persistent
stratigraphic
incongruence
does
not
resolve
–
dilemma.
Язык: Английский
Neuroanatomy of the crocodylomorph Portugalosuchus azenhae from the late cretaceous of Portugal
Journal of Anatomy,
Год журнала:
2023,
Номер
242(6), С. 1146 - 1171
Опубликована: Фев. 2, 2023
Abstract
We
present
the
first
detailed
braincase
anatomical
description
and
neuroanatomical
study
of
Portugalosuchus
azenhae
,
from
Cenomanian
(Late
Cretaceous)
Portugal.
This
eusuchian
crocodylomorph
was
originally
described
as
a
putative
Crocodylia
one
oldest
representatives
this
clade;
however,
its
phylogenetic
position
remains
controversial.
Based
on
new
data
obtained
high
resolution
Computed
Tomography
images
(by
micro‐CT
scan),
aims
to
improve
original
taxon
also
update
scarce
knowledge
Eusuchia
time
interval,
key
period
understand
origin
evolution
these
clades.
The
resulting
three‐dimensional
models
CT
allowed
well‐preserved
neurocranium
internal
cavities.
Therefore,
it
possible
reconstruct
cavities
olfactory
region,
nasopharyngeal
ducts,
brain,
nerves,
carotid
arteries,
blood
vessels,
paratympanic
sinus
system
inner
ear,
which
estimate
some
neurosensorial
capabilities.
By
comparison
with
other
crocodylomorphs,
analyses
showed
that
back
in
Cenomanian,
already
displayed
an
olfactive
acuity,
sight,
hearing
cognitive
skills
within
range
observed
basal
eusuchians
crocodylians,
including
extant
species.
In
addition,
order
test
disputed
position,
data,
helped
correct
complete
observations,
were
included
most
recent
morphology‐based
phylogenies.
differs
slightly
publication
since
is
now
located
“thoracosaurid”
Gavialoidea,
but
still
crocodylian.
Despite
all
this,
better
contrast
results,
additional
morphological
character
coding
together
DNA
should
be
performed.
Язык: Английский
A new Crocodyloidea from the middle Eocene of Zamora (Duero Basin, Spain)
The Anatomical Record,
Год журнала:
2024,
Номер
unknown
Опубликована: Март 5, 2024
The
eusuchian
crocodyliforms
recorded
in
the
Eocene
levels
of
Spanish
Duero
Basin
belong
to
three
lineages:
Planocraniidae,
with
species
Duerosuchus
piscator;
Alligatoroidea,
represented
by
several
specimens
genus
Diplocynodon;
and
Crocodyloidea,
which
includes
traditionally
attributed
Asiatosuchus.
Asiatosuchus,
established
1940
based
on
a
middle
from
Mongolia,
has
subsequently
served
as
wastebasket
taxon
for
Paleogene
remains
belonging
species,
not
only
Asia
but
also
European
North
American
records.
Many
these
are
known
highly
fragmentary
remains,
sharing
presence
characters
such
flat
triangular
skull,
long
symphyses
lower
jaw,
recognized
characteristic
crocodyloids.
In
addition
isolated
cranial
among
material
Asiatosuchus
at
stands
out
nearly
complete
skull
left
mandible,
area
Casaseca
de
Campeán
(Zamora
Province).
present
study
analyses
detail
specimens,
previously
reported
during
1980s,
analyzed
very
preliminary
way.
They
included
first
time
phylogenetic
analysis
establish
systematic
position
this
form.
results
confirm
that
it
corresponds
new
basal
crocodyloid,
defined
here
oenotriensis
sp.
nov.
Язык: Английский
Virtual reconstruction of the neurocranial anatomy of Kansajsuchus extensus (Neosuchia: Paralligatoridae) from the Upper Cretaceous of Tadzhikistan with a review of braincase osteology in Neosuchia
Cretaceous Research,
Год журнала:
2024,
Номер
164, С. 105959 - 105959
Опубликована: Дек. 1, 2024
Язык: Английский
The anatomy and taxonomy of the North African Early Miocene crocodylian ‘ Tomistoma ’ dowsoni and the phylogenetic relationships of gavialoids
Journal of Systematic Palaeontology,
Год журнала:
2024,
Номер
22(1)
Опубликована: Окт. 3, 2024
Язык: Английский
Neurocranial anatomy of Paralligator (Neosuchia: Paralligatoridae) from the Upper Cretaceous of Mongolia
Zoological Journal of the Linnean Society,
Год журнала:
2024,
Номер
203(1)
Опубликована: Дек. 13, 2024
Abstract
Neurocranial
features
appear
to
be
phylogenetically
informative
and
key
in
assessing
the
still
contentious
relationships
within
Crocodylomorpha.
However,
braincases
of
many
non-crocodylian
taxa
are
incompletely
studied
precluding
assessment
evolutionary
modifications
at
base
Crocodylia.
Here,
we
describe
braincase
osteology
neuroanatomy
paralligatorid
crocodylomorph
Paralligator
from
Upper
Cretaceous
Mongolia
based
on
computed
tomography
(CT)-scanning,
segmentation,
3D
modelling
several
specimens.
The
anatomy
brain
endocast,
nerves,
paratympanic
pneumatic
cavities
is
consistent
with
its
phylogenetic
position
close
or
Eusuchia.
shares
a
suit
neuroanatomical
basal
eusuchians
crocodylians
reflecting
plesiomorphic
condition
for
In
addition,
differences
endocasts
between
larger-sized
individuals
Kansajsuchus
smaller
Shamosuchus
ontogenetic
changes
extant
crocodylians.
This
suggests
that
members
more
clade
Paralligatoridae
crown-group
Crocodylia
share
similar
during
ontogeny.
We
also
review
distribution
mesethmoid
Crocodylomorpha
show
presence
clades
including
Dyrosauridae.
Язык: Английский