Rep ese tative
Image
of
a
a e
f eshwate
cave
s ail
with
a
t a sluce t
shell
i
a
da k
cave
e vi o me t
(AI-ge e ated
image)
Scie tists
have
ide tified
Chi a’s
fi st
k ow
f eshwate
cave
s ail,
a
species
so
a e
that
o ly
th ee
livi g
adults
have
eve
bee
fou d.
The
ti y
a imal
has
o
eyes,
almost
o
colou
i
its
body,
a d
a
t a sluce t
shell
thi
e ough
to
eveal
the
delicate
tissue
u de eath.
Resea che s
discove ed
it
deep
i side
a
mou tai
cave
i
southweste
Chi a,
whe e
su light
eve
eaches,
a d
life
has
adapted
acco di gly.
The
ewly
ide tified
species,
amed
E haia
dijia g,
was
fou d
i
Ho gta
Dist ict
of
Yuxi
City
i
Yu a
P ovi ce.
Its
discove y
fills
a
otable
gap
i
the
study
of
East
Asia’s
u de g ou d
f eshwate
ecosystems,
which
emai
fa
less
explo ed
tha
habitats
above
g ou d,
a d
aises
f esh
questio s
about
how
such
a
f agile
species
has
ma aged
to
su vive
at
all.
Why
this
ewly
fou d
s ail
has
o
eyes
o
colou
Why
this
ewly
fou d
s ail
has
o
eyes
o
colou
E haia
dijia g
belo gs
to
a
g oup
of
a imals
called
t oglobio ts,
mea i g
it
is
built
e ti ely
fo
life
i side
caves
a d
ca ot
su vive
elsewhe e.
Ove
cou tless
ge e atio s
i
pe ma e t
da k ess,
the
species
lost
its
eyes
a d
the
elated
st uctu es
that
o ce
suppo ted
them,
si ce
visio
offe s
o
adva tage
whe e
the e
is
o
light
to
see
by.
Its
body
also
lacks
the
pigme tatio
that
p otects
ma y
su face-dwelli g
a imals
f om
su light,
a othe
t ait
commo
amo g
cave-adapted
species
that
eve
eed
such
p otectio .
I
labo ato y
obse vatio s,
the
s ails
avoided
light
st o gly
whe eve
they
we e
exposed
to
it,
quickly
c awli g
i to
a ow
spaces
be eath
ocks
to
hide.
How
the
s ail
got
its
u usual
ame
How
the
s ail
got
its
u usual
ame
The
s ail’s
bla k,
faceless
appea a ce
shaped
the
ame
esea che s
gave
it.
E haia
dijia g
is
amed
afte
Di
Jia g,
a
mou tai
god
desc ibed
i
the
a cie t
Chi ese
text
Classic
of
Mou tai s
a d
Seas
as
a
faceless
c eatu e,
a
fitti g
match
fo
a
a imal
whose
head
shows
o
t ace
of
eyes
o
a
defi ed
face.
The
species
belo gs
to
the
family
E haiidae,
a d
its
fo mal
desc iptio
appea s
i
a
study
published
i
the
jou al
Subte a ea
Biology,
titled
A
ew
eyeless
species
i
E haiidae
(Gast opoda,
T u catelloidea)
f om
a
cave
i
Yuxi
City,
Yu a ,
Chi a,
autho ed
by
Yue-Mi g
He
a d
colleagues.
Whe e
this
a e
cave
s ail
was
fou d
livi g
Whe e
this
a e
cave
s ail
was
fou d
livi g
The
discove y
also
exte ds
the
k ow
a ge
of
these
s ails
to
u usually
high
elevatio .
The
cave
sits
2,062
met es
above
sea
level,
the
highest
eco ded
elevatio
fo
a
cave-dwelli g
membe
of
the
E haiidae
family,
showi g
that
f eshwate
cave
s ails
ca
su vive
i
high-altitude
ka st
systems
mo e
tha
2,000
met es
up.
Ka st
la dscapes
fo m
whe
wate
slowly
dissolves
soluble
ock
u de g ou d,
c eati g
etwo ks
of
caves,
hidde
st eams
a d
isolated
pools.
These
systems
ofte
fu ctio
like
biological
isla ds,
keepi g
populatio s
cut
off
f om
the
outside
wo ld
a d
f om
each
othe
fo
lo g
st etches
of
time,
which
allows
highly
specialised
species
to
evolve
withi
a
si gle
cave
o
wate
system
a d
owhe e
else.
What
life
looks
like
i side
the
cave
habitat
What
life
looks
like
i side
the
cave
habitat
E haia
dijia g
lives
amo g
g avel
a d
b oke
sto e
i
shallow
cave
wate
less
tha
o e
met e
deep,
whe e
the
tempe atu e
stays
close
to
20
deg ees
Celsius
despite
the
cave’s
high
elevatio .
The
s ails
feed
by
g azi g
o
diatoms
g owi g
ac oss
subme ged
ocks,
a d
esea che s
fou d
they
will
also
eat
fish
food
u de
labo ato y
co ditio s.
Heavy
ai
occasio ally
pushes
fast-movi g
wate
th ough
the
cave,
sweepi g
a
few
s ails
towa d
the
e t a ce,
yet
esea che s
fou d
o
i dividuals
i
the
su face
st eams
ea by.
The
a imals
co siste tly
stayed
withi
the
cave
a d
withi
two
met es
of
its
e t a ce,
suggesti g
that
eve
b ief
exposu e
to
co ditio s
outside
the
cave
may
be
u suitable
fo
thei
su vival.
Why
esea che s
a e
wo ied
about
its
su vival
Why
esea che s
a e
wo ied
about
its
su vival
Du i g
a
su vey
co ducted
i
August
2025,
scie tists
fou d
o ly
th ee
livi g
adult
s ails
a d
a
si gle
empty
shell,
with
o
juve iles
obse ved
at
all,
aisi g
co ce
about
whethe
the
populatio
is
ep oduci g
successfully.
Resea che s
desc ibed
the
species’
su vival
outlook
as
fa
f om
optimistic,
give
how
few
i dividuals
have
bee
docume ted
a d
how
a owly
the
populatio
is
co fi ed
to
o e
small
u de g ou d
habitat.
That
ext eme
specialisatio
leaves
the
species
with
almost
o
p otectio
agai st
pollutio ,
cha ges
i
wate
flow,
distu ba ce
to
the
cave,
o
othe
localised
th eats
that
would
pose
little
isk
to
a
mo e
widesp ead
a imal.
Because
the
e ti e
k ow
populatio
exists
withi
a
si gle
cave
system,
a y
damage
to
that
o e
site
could
be
e ough
to
wipe
out
the
species
completely,
a d
esea che s
a e
ow
calli g
fo
wide
su veys
ac oss
Chi a’s
othe
caves
to
dete mi e
whethe
E haia
dijia g
su vives
elsewhe e
o
whethe
simila ly
ove looked
species
emai
u discove ed.
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