Here
we
describe
a
new
derived
tyrannosaurine,
Daspletosaurus
wilsoni
sp.nov.,
from
Judithian
strata
(~76.5
Ma)
intermediate
in
age
between
either
of
the
previously
described
species
this
genus.D.
displays
unique
combination
ancestral
and
characteristics,
including
cornual
process
lacrimal
reduced
height
relative
to
D.
torosus
more
basal
tyrannosaurines,
prefrontal
with
long
axis
oriented
rostrally
than
horneri
tyrannosaurines.The
description
taxon
provides
insight
into
evolutionary
mode
Tyrannosaurinae,
lending
strength
previous
hypotheses
anagenesis
within
increasing
resolution
which
evolution
lineage
can
be
reconstructed.Cladistic
phylogenetic
methods,
stratigraphy,
qualitative
analysis
morphology
relevant
taxa
supports
an
anagenetic
model
for
origin
morphological
novelty
genus,
highlighting
predominance
among
contemporary
dinosaur
lineages.
The Anatomical Record,
Год журнала:
2024,
Номер
307(12), С. 3685 - 3716
Опубликована: Апрель 26, 2024
Recent
years
have
seen
increasing
scientific
interest
in
whether
neuron
counts
can
act
as
correlates
of
diverse
biological
phenomena.
Lately,
Herculano-Houzel
(2023)
argued
that
fossil
endocasts
and
comparative
neurological
data
from
extant
sauropsids
allow
to
reconstruct
telencephalic
Mesozoic
dinosaurs
pterosaurs,
which
might
proxies
for
behaviors
life
history
traits
these
animals.
According
this
analysis,
large
theropods
such
Tyrannosaurus
rex
were
long-lived,
exceptionally
intelligent
animals
equipped
with
"macaque-
or
baboon-like
cognition",
whereas
sauropods
most
ornithischian
would
displayed
significantly
smaller
brains
an
ectothermic
physiology.
Besides
challenging
established
views
on
dinosaur
biology,
claims
raise
questions
count
estimates
could
benefit
research
general.
Here,
we
address
findings
by
revisiting
Herculano-Houzel's
work,
identifying
several
crucial
shortcomings
regarding
analysis
interpretation.
We
present
revised
encephalization
dinosaurs,
derive
phylogenetically
informed
modeling
amended
dataset
endocranial
measurements.
For
large-bodied
particular,
recover
lower
than
previously
proposed.
Furthermore,
review
the
suitability
variables
numbers
relative
brain
size
predict
cognitive
complexity,
metabolic
rate
coming
conclusion
they
are
flawed
Instead
relying
when
reconstructing
argue
integrative
studies
needed
approach
complex
subject.
Journal of Anatomy,
Год журнала:
2024,
Номер
245(3), С. 490 - 500
Опубликована: Май 10, 2024
Derived
ornithopods,
such
as
hadrosaurids,
show
a
high
occurrence
of
fossilized
lesions
and
diseases.
However,
paleopathologies
in
iguanodontians
seem
to
be
less
common,
considering
the
rich
fossil
record
these
taxa
Europe,
particular
Belgium,
Britain
Spain.
Here,
we
describe
an
iguanodontian
femur
discovered
England
that
exhibits
large
overgrowth
its
lateral
aspect,
not
previously
recognized
any
other
similar
remains.
The
specimen
was
scanned
with
micro-computed
tomography
(microCT)
later
sectioned
three
sites
for
histological
analysis.
belongs
early
adult
Iguanodontia
indet.,
based
on
presence
woven
parallel
fibered
complex
outer
cortex
four
lines
arrested
growth.
Internal
analysis
dome-like
suggests
it
can
diagnosed
fracture
callus.
injury
might
have
negatively
impacted
upon
animal's
locomotion
trauma
had
occurred
region
above
knee,
crucial
spot
hindlimb
musculature.
Finally,
cancellous
medullary
bone-like
tissue
cavity
next
pathological
overgrowth.
An
attempt
made
determine
precise
nature
this
tissue,
bone
is
linked
ovulation
period
(avian)
dinosaurs,
whereas
types
endosteal,
been
bones.
Journal of Paleontology,
Год журнала:
2025,
Номер
unknown, С. 1 - 10
Опубликована: Янв. 23, 2025
Abstract
Identifying
feeding
interactions
in
the
fossil
record
remains
a
key
challenge
for
paleoecologists.
We
report
rare
occurrence
of
conical,
perforative
bite
mark
cervical
vertebra
an
azhdarchid
pterosaur,
which
we
identified
as
juvenile
individual
Cryodrakon
boreas
Hone,
Habib,
and
Therrien,
2019
from
Campanian
Dinosaur
Park
Formation
Alberta,
Canada.
Based
on
comparative
analysis
dentition
ecomorphology
potential
trace
makers
Formation,
well
morphology
trace,
most
likely
candidate
is
crocodilian,
although
whether
it
was
made
result
scavenging
or
predatory
behavior
unknown.
Feeding
involving
pterosaurs
are
globally,
whereas
crocodilian
marks
not
uncommon
Cretaceous
terrestrial
ecosystems.
Given
opportunistic
style
known
range
food
items
both
extant
extinct
crocodilians,
can
be
counted
rare,
but
surprising,
component
at
least
some
diets.
PeerJ,
Год журнала:
2022,
Номер
10, С. e14461 - e14461
Опубликована: Ноя. 25, 2022
Here
we
describe
a
new
derived
tyrannosaurine,
Daspletosaurus
wilsoni
sp.
nov.,
from
Judithian
strata
(~76.5
Ma)
intermediate
in
age
between
either
of
the
previously
described
species
this
genus.
D.
displays
unique
combination
ancestral
and
characteristics,
including
cornual
process
lacrimal
reduced
height
relative
to
torosus
more
basal
tyrannosaurines,
prefrontal
with
long
axis
oriented
rostrally
than
horneri
tyrannosaurines.
The
description
taxon
provides
insight
into
evolutionary
mode
Tyrannosaurinae,
lending
strength
previous
hypotheses
anagenesis
within
increasing
resolution
which
evolution
lineage
can
be
reconstructed.
Cladistic
phylogenetic
methods,
stratigraphy,
qualitative
analysis
morphology
relevant
taxa
supports
an
anagenetic
model
for
origin
morphological
novelty
genus,
highlighting
predominance
among
contemporary
dinosaur
lineages.
Geological Society of America Bulletin,
Год журнала:
2023,
Номер
136(7-8), С. 2689 - 2701
Опубликована: Ноя. 15, 2023
Abstract
The
Cretaceous
paleocommunities
of
North
America
preserve
a
rich
record
biodiversity
that
suggests
many
species
occupied
narrow
biogeographic
ranges
in
comparison
to
their
ecological
equivalents
extant
systems.
How
taxa
these
systems
partitioned
niches
and
structured
communities
can
be
difficult
determine
from
fossils
alone,
which
has
led
variety
hypotheses
concerning
diets
habitat
use.
Here,
we
examine
element
ratios
(Sr/Ca,
Ba/Ca)
the
enamel
suite
co-occurring
vertebrate
sampled
spatiotemporally
constrained
interval
Oldman
Formation
Alberta,
Canada,
reconstruct
trophic
structure,
use
δ13C,
δ18O,
87Sr/86Sr
compositions
test
for
niche
partitioning
among
hadrosaurids,
ceratopsids,
ankylosaurs.
We
also
previously
proposed
dietary
troodontid
theropods.
In
large
ornithischians,
find
Ba/Ca
Sr/Ca
are
consistent
with
herbivory,
hadrosaurs
distinct
ceratopsids
ankylosaurids
ranges,
pattern
is
indicative
differences
use/breadth,
plant
sources,
feeding
height.
mammals,
varanoid
lizards,
dromaeosaurids,
tyrannosaurids
gradient
lower
animal-dominant
omnivorous
faunivorous
diets.
Troodontids,
have
been
variably
hypothesized
as
either
faunivorous,
omnivorous,
or
herbivorous
due
unusual
dentition,
fall
between
those
ornithischians
dromaeosaurids.
From
multi-proxy
data,
interpret
troodontids
mixed-feeding
plant-dominant
omnivores.
These
proxies
represent
valuable
tool
understanding
community
ecology
ecosystems
hold
enormous
potential
future
research
paleobiology.
PLoS ONE,
Год журнала:
2024,
Номер
19(7), С. e0306819 - e0306819
Опубликована: Июль 31, 2024
Paleopathology,
the
study
of
diseases
and
injuries
from
fossil
record,
allows
for
a
unique
view
into
life
prehistoric
animals.
Pathologies
have
nowadays
been
described
in
nearly
all
groups
vertebrates,
especially
dinosaurs.
Despite
large
number
skeletons,
pathologies
had
never
reported
sauropodomorph
Plateosaurus
trossingensis
.
Here
we
describe
first
using
two
individuals
with
chevrons
tail,
Upper
Triassic
Trossingen,
SW
Germany.
The
specimens
each
contain
three
consecutive
pathological
chevrons.
Our
results
show
that
were
caused
by
external
trauma
one
individual
potentially
tendinous
other.
Healing
lesions
allowed
survival
both
Using
additional
found
other
collections
multiple
localities,
observe
14.8%
within
their
chevrons,
suggesting
it
was
vulnerable
bone.
