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serpula
noun
(zoology)
Any
of
numerous
species
of
tubicolous
annelids
of
the
genus
Serpula
and
allied
genera
of
the
family
Serpulidae
that
secrete
a
calcareous
tube,
usually
irregularly
contorted,
but
sometimes
spirally
coiled,
with
a
wreath
of
plumelike
and
often
bright-colored
gills
around
its
head,
and
usually
an
operculum
to
close
the
aperture
of
its
tube
when
it
retracts.