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.
Historical Biology,
Год журнала:
2024,
Номер
unknown, С. 1 - 24
Опубликована: Ноя. 28, 2024
The
original
publication
on
the
Pliocene
Otibanda
Formation
in
Papua
New
Guinea
briefly
reported
crocodyliform
fossils,
including
isolated
teeth
that
were
tentatively
assigned
to
notosuchian
subclade
Sebecosuchia.
In
this
study,
we
reassess
material
from
and
provide
first
detailed
descriptions
of
same,
purported
sebecosuchian
teeth.
Direct
examination
these
confirms
their
ziphodont
condition
based
labiolingual
compression
crowns
presence
serrated
mesial
distal
carinae.
addition
teeth,
there
are
also
non-serrate
conical
referred
an
undetermined
species
Crocodylus
as
well
fragmentary
postcranial
elements
refer
Crocodylia
incertae
sedis.
Considering
geological
age
geographical
origin
tooth
Guinea,
they
unlikely
belong
a
crocodyliform.
Instead,
it
is
more
plausible
referable
Mekosuchinae,
highly
diverse
crocodylian
clade
inclusive
forms
was
prevalent
mainland
Australia
for
most
Cenozoic.
Journal of Anatomy,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 20, 2024
Abstract
The
endosseous
labyrinths
are
associated
with
several
functions,
including
hearing
and
spatial
orientation.
Throughout
their
evolutionary
history,
crocodylomorphs
have
thrived
in
diverse
environments,
the
morphology
of
has
been
suggested
as
a
proxy
for
inferring
lifestyle.
However,
relationships
between
shape
ontogenetic
phylogenetic
factors
difficult
to
interpret
rarely
investigated
depth
previously,
particularly
terms
dataset
size.
Here,
we
present
most
complete
date
on
extant
crocodylians,
111
specimens
covering
22
species
different
status
(from
hatchlings
adults).
Using
3D
geometric
morphometrics,
show
that
allometry
constitutes
major
contributor
variation
crocodylian
development
this
structure
is
likely
linked
braincase
conformation,
all
genera.
We
also
find
moderate
signal,
but
only
without
considering
size
effect,
so
it
could
not
be
translated
into
relevant
discrete
morphological
characters.
Based
these
results,
discuss
remaining
problems
prevent
inclusion
fossil
forms
highly
divergent
lifestyles
study
how
ecological
differences
shaped
crocodylomorphs.
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.
