Yeti claws: Cheliped sexual dimorphism and symmetry in deep-sea yeti crabs (Kiwaidae)
PLoS ONE,
Год журнала:
2025,
Номер
20(2), С. e0314320 - e0314320
Опубликована: Фев. 5, 2025
Yeti
crabs
(Kiwaidae)
are
deep-sea
hydrothermal
vent
and
methane
seep
dwelling
crustaceans
that
farm
chemosynthetic
microbes
on
their
bodies.
Sexual
dimorphism
is
a
common
feature
of
decapod
crustaceans,
but
little
known
about
its
prevalence
in
species
from
habitats.
We
address
this
knowledge
deficit
by
investigating
claw
sexual
symmetry
the
hydrothermal-vent
endemic
’Hoff
crab’,
Kiwa
tyleri
.
A
total
135
specimens
East
Scotia
Ridge
were
examined,
revealing
mean
asymmetry
indices
close
to
zero
with
respect
propodus
length
height,
albeit
significantly
larger
number
marginally
left-dominant
individuals
length,
possibly
indicative
some
task
specialisation
between
claws,
or
vestigial
ancestral
trait.
Both
male
female
claws
exhibit
positive
allometry
increasing
carapace
males
possess
compared
females
when
accounting
for
size,
exhibiting
faster
growing
broader
heights
throughout
size
distribution.
This
marked
difference
either
male-male
competition
mate
access,
selection,
differential
energy
allocation
(growth
vs
reproduction)
females,
as
observed
other
crustaceans.
In
contrast,
reanalysis
data
inhabiting
yeti
crab
puravida
revealed
no
significant
allometry,
indicating
possible
lack
similar
selection
pressures,
highlighting
potential
key
differences
ecological
reproductive
strategies
K
relating
function,
microbial
productivity
population
density.
Whether
sex
represents
norm
exception
Kiwaidae
will
require
examination
family.
research
enhances
our
understanding
behaviour,
ecology
evolution
crabs,
providing
basis
future
studies.
Язык: Английский
Is there a trade-off between sperm production and sexual weaponry in the Amazon River prawn Macrobrachium amazonicum (Heller, 1862)?
Zoology,
Год журнала:
2022,
Номер
153, С. 126029 - 126029
Опубликована: Июль 6, 2022
Язык: Английский
Male crayfish (Faxonius obscurus, Decapoda: Cambaridae) claws are longer and stronger yet comparable in shape during the reproductive season
Biological Journal of the Linnean Society,
Год журнала:
2023,
Номер
139(1), С. 57 - 69
Опубликована: Март 31, 2023
Abstract
Animal
weapons
are
diverse
and
often
exaggerated
structures
associated
with
sexual
selection
male–male
combat.
Despite
their
diversity,
our
knowledge
of
these
comes
primarily
from
studies
that
focus
on
the
size
neglect
other
components,
such
as
shape
or
performance.
Furthermore,
can
exhibit
species-level
plasticity
based
nutrition
ecological
variables,
but
few
have
documented
seasonal
variation
in
weapon
plasticity.
Here,
we
investigate
how
size,
performance
differ
across
adult
male
reproductive
non-reproductive
Allegheny
crayfish,
Faxonius
obscurus.
Given
F.
obscurus
cambarid
crayfishes
cyclical
moulting
between
states,
they
provide
an
ideal
system
which
to
questions.
We
found
claws
all
three
components
investigated;
males
were
longer,
stronger
different
compared
males.
Wielding
longer
is
likely
confer
greater
competitive
success
during
mating
season,
demonstrates
unexplored
pattern
discuss
results
considering
seasonality
phenotypes
propose
several
avenues
future
research
using
crayfish
a
model
system.
Язык: Английский
From color to shape: ontogenetic shifts in traits of the freshwater crab Dilocarcinus pagei (Brachyura: Trichodactylidae)
Canadian Journal of Zoology,
Год журнала:
2023,
Номер
101(8), С. 658 - 671
Опубликована: Апрель 25, 2023
Crustaceans
usually
undergo
a
series
of
changes
after
the
puberty
molt.
These
are
often
associated
with
size
increases
in
body
and
structures
such
as
abdomen
claws
so
that
they
can
achieve
higher
reproductive
fitness.
morphological
allow
animal
to
fight,
court,
signal
for
its
conspecific
better
performance.
To
compare
ontogenetic
changes,
we
used
freshwater
crab
Dilocarcinus
pagei
Stimpson,
1851
model.
We
analyzed
differences
carapace
claw
shape,
force
generation
(via
apodeme
area),
integration
claws,
color
among
demographic
groups.
Adult
crabs
had
an
increase
followed
by
shape
change
makes
more
robust.
In
addition,
animals
changed
from
dark
brown
coloration
juveniles
red
adult
males,
while
females
presented
red-brown
coloration.
Presumably,
phenotypic
may
enhance
crabs’
ability
obtain
different
food
sources,
well
fight
sexual
partners,
manipulate
during
courtship.
Color
be
strategy
which
males
females,
help
camouflage
substrate.
Язык: Английский
Size, but not sex, predicts pinch force and exoskeleton mechanical properties in crayfish of the genus Faxonius
Invertebrate Biology,
Год журнала:
2023,
Номер
142(3)
Опубликована: Авг. 14, 2023
Abstract
Studies
of
animal
weaponry
and
defensive
structures
rarely
take
into
consideration
their
underlying
mechanical
properties.
We
measured
the
compressive
strength
thickness
exoskeleton
claw
(chela)
in
two
North
American
crayfish
species,
Faxonius
virilis
F.
limosus
.
performed
similar
measures
on
carapace,
a
body
region
not
directly
involved
agonistic
contests.
Males
both
species
generated
significantly
stronger
maximum
pinch
forces
than
females.
However,
these
differences
can
be
attributed
to
size
between
sexes.
The
(ultrastructure)
was
significant
predictor
its
likely
explained
difference
we
observed
species.
Neither
nor
correlated
with
force.
Additionally,
found
that
strong
carapace
thickness,
whereas
sex
not.
had
greater
corresponding
values
for
carapace.
Our
study
shows
properties
are
largely
function
highlights
need
integrate
studies
morphology
performance.
Язык: Английский
The evolution of multi-component weapons in the superfamily of leaf-footed bugs
bioRxiv (Cold Spring Harbor Laboratory),
Год журнала:
2023,
Номер
unknown
Опубликована: Апрель 25, 2023
ABSTRACT
Sexually
selected
weapons,
such
as
the
antlers
of
deer,
claws
crabs,
and
tusks
beaked
whales,
are
strikingly
diverse
across
taxa
even
within
groups
closely
related
species.
Phylogenetic
comparative
studies
have
typically
taken
a
simplified
approach
to
investigating
evolution
weapon
diversity,
examining
gains
losses
entire
major
shifts
in
size
or
type,
changes
location.
Less
understood
is
how
individual
components
evolve
assemble
into
complete
weapon.
We
addressed
this
question
by
diverse,
multi-component
hind-leg
body
weapons
leaf-footed
bugs,
Superfamily
Coreoidea
(Hemiptera:
Heteroptera).
Male
bugs
use
their
fight
for
access
mating
territories.
used
large
multilocus
dataset
comprised
ultraconserved
element
loci
248
species
inferred
evolutionary
transitions
among
component
states
using
ancestral
state
estimation.
found
that
added
over
time
with
some
evidence
cyclical
pattern
—
followed
then
again.
Further,
we
certain
trait
combinations
evolved
repeatedly
phylogeny.
This
work
reveals
remarkable
dynamic
form
bugs.
It
also
highlights
may
be
especially
useful
providing
insights
interplay
function.
TEASER
TEXT
For
centuries,
humans
been
fascinated
morphological
animals
engage
battle.
The
diversity
sexually
surprising,
considerable
variation
animals.
Studies
needed
take
detailed
view
comprise
assembly
these
structure.
Here,
reconstruct
superfamily
insects.
spiky,
enlarged
hind
legs
wrestle
measured
15
putative
species,
phylogenetic
analyses.
number
generally
increased
time,
many
along
way.
were
more
likely
others,
suggesting
specific
might
functional
complex,
reconstructing
Язык: Английский
Chela asymmetry and dimorphism in the red swamp crayfish <b><i>Procambarus clarkii</i></b> (Decapoda: Astacidea: Cambaridae)
Crustacean Research,
Год журнала:
2023,
Номер
52(0), С. 97 - 108
Опубликована: Дек. 8, 2023
The
red
swamp
crayfish
Procambarus
clarkii
exhibits
different
sexual
morphotypes
(reproductive
type,
form
I;
non-reproductive
II)
in
both
sexes
after
reaching
maturity.
This
species
shows
intra-
and
inter-sexual
dimorphisms
of
chela
size:
the
chelae
are
largest
I
males,
followed
by
females
II
smallest
females.
Chelipeds
this
asymmetrical,
with
one
being
larger
than
other.
However,
little
is
known
about
degree
asymmetry
P.
clarkii.
We
examined
further
elucidated
dimorphism.
Larger
occurred
randomly
on
either
right
or
left
sides.
size
differences
between
smaller
were
primarily
small,
some
individuals
had
regenerating
chelipeds.
Allometric
growth
analyses
revealed
shape,
males
exhibiting
slender
wide
chelae,
respectively.
Male
clarkii’s
may
function
as
useful
weapons,
whereas
female
large
also
tools
for
constructing
maintaining
deeper
burrows
breeding.
Язык: Английский
Evolvability in the Cephalothoracic Structural Complexity of Aegla araucaniensis (Crustacea: Decapoda) Determined by a Developmental System with Low Covariational Constraint
Biology,
Год журнала:
2022,
Номер
11(7), С. 958 - 958
Опубликована: Июнь 24, 2022
The
integration
of
complex
structures
is
proportional
to
the
intensity
structural
fusion;
its
consequences
are
better
known
than
covariational
effects
under
less
restrictive
mechanisms.
synthesis
a
palimpsest
model
based
on
two
early
parallel
pathways
and
later
direct
pathway
explains
cephalothoracic
complexity
decapod
crustaceans.
Using
this
model,
we
tested
evolvability
developmental
modularity
in
Aegla
araucaniensis,
an
anomuran
crab
with
evident
adaptive
sexual
dimorphism.
asymmetric
patterns
found
landmark
configurations
suggest
independent
perturbations
each
module
stable
asymmetry
variance
near
fusion
by
canalization
pathway,
which
was
more
intense
males.
greater
flexibility
imposed
promotes
expression
gonadic
that
favors
reproductive
output
females
agonistic
contributes
mating
success
Under
these
divergent
expressions
evolvability,
smaller
difference
between
males
suggests
higher
levels
due
relatively
fusion.
We
conclude
that:
(1)
cephalothorax
A.
araucaniensis
evolvable
structure,
where
promote
disruptions
functional
modularity,
restricted
males,
(2)
decapods
has
empirical
advantages
studying
causes
evolution
structures.
Язык: Английский
Sexual and size dimorphism in two deep-water hermit crabs (Decapoda: Parapaguridae) from the Western Atlantic Ocean
Nauplius,
Год журнала:
2023,
Номер
31
Опубликована: Янв. 1, 2023
The
Parapaguridae
comprises
hermit
crabs
that
inhabit
deep-water
environments.
In
these
environments,
shell
availability
can
be
limited,
mostly
consisting
of
small
and
fragile-shelled
gastropods.
Thus,
different
strategies
have
evolved
to
mitigate
this
limited
supply.
Sympagurus
dimorphus
(Studer,
1883)
lives
in
association
with
a
zoanthid
cnidarian
creates
pseudo-shell
grows
the
crab.
contrast,
Oncopagurus
gracilis
(Henderson,
1888)
inhabits
small,
calcified
gastropod
shells.
Therefore,
we
selected
two
species
as
models
test
sexual
dimorphism
shape
patterns
their
chelipeds
cephalothoracic
shield,
due
shelter
acquisition
methods.
We
photographed
animals
digitized
images
employ
comparative
geometric
morphometric
techniques.
tested
differences
between
sexes
within
each
species,
also
size
based
on
centroid
size.
For
O.
gracilis,
found
for
however,
only
observed
chelipeds.
S.
dimorphus,
an
inverse
pattern
was
found,
which
females
presented
more
robust
chelipeds,
present
males
were
larger.
These
reasonably
explained
by
methods,
depends
shells
limit
growth,
while
its
pseudo-shell.
robustness
may
related
behaviors,
e.g.,
addition
competition
shells,
they
fight
during
mating.
However,
emphasize
future
studies
other
populations
are
needed
purposes.
Язык: Английский