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Definition of mollusca
Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of mollusca is as below...
Mollusca
(n. pl.) One of the grand
divisions
of the
animal
kingdom,
including
the
classes
Cephalopoda,
Gastropoda,
PteropodaScaphopoda,
and
Lamellibranchiata,
or
Conchifera.
These
animals
have an
unsegmented
bilateral
body, with most of the
organs
and parts
paired,
but not
repeated
longitudinally.
Most of them
develop
a
mantle,
which
incloses
either
a
branchial
or a
pulmonary
cavity.
They are
generally
more or less
covered
and
protected
by a
calcareous
shell,
which may be
univalve,
bivalve,
or m
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Odontoblast
::
Odontoblast
(n.) One of the cells which
secrete
the
chitinous
teeth of
Mollusca.
Acephala
::
Acephala
(n. pl.) That
division
of the
Mollusca
which
includes
the
bivalve
shells,
like the clams and
oysters;
-- so
called
because
they have no
evident
head.
Formerly
the group
included
the
Tunicata,
Brachiopoda,
and
sometimes
the
Bryozoa.
See
Mollusca..
Opisthopulmonate
::
Opisthopulmonate
(a.)
Having
the
pulmonary
sac
situated
posteriorly;
-- said of
certain
air-breathing
Mollusca.
Tectibranchiata
::
Tectibranchiata
(n. pl.) An
order,
or
suborder,
of
gastropod
Mollusca
in which the gills are
usually
situated
on one side of the back, and
protected
by a fold of the
mantle.
When there is a
shell,
it is
usually
thin and
delicate
and often
rudimentary.
The
aplysias
and the
bubble
shells
are
examples..
Placophora
::
Placophora
(n. pl.) A
division
of
gastropod
Mollusca,
including
the
chitons.
The back is
covered
by eight
shelly
plates.
Called
also
Polyplacophora.
See
Illust.
under
Chiton,
and
Isopleura..
Scaphopda
::
Scaphopda
(n. pl.) A class of
marine
cephalate
Mollusca
having
a
tubular
shell open at both ends, a
pointed
or
spadelike
foot for
burrowing,
and many long,
slender,
prehensile
oral
tentacles.
It
includes
Dentalium,
or the tooth
shells,
and other
similar
shells.
Called
also
Prosopocephala,
and
Solenoconcha..
Geophila
::
Geophila
(n. pl.) The
division
of
Mollusca
which
includes
the land
snails
and
slugs.
Molluscan
::
Molluscan
(a.) Of or
pertaining
to
mollusks.
Cirrus
::
Cirrus
(n.) The
external
male organ of
trematodes
and some other
worms,
and of
certain
Mollusca..
Bojanus Organ
::
Bojanus
organ () A
glandular
organ of
bivalve
mollusca,
serving
in part as a
kidney..
Malacozoa
::
Malacozoa
(n. pl.) An
extensive
group of
Invertebrata,
including
the
Mollusca,
Brachiopoda,
and
Bryozoa.
Called
also
Malacozoaria..
Ostrea
::
Ostrea
(n.) A genus of
bivalve
Mollusca
which
includes
the true
oysters.
Mollusk
::
Mollusk
(n.) One of the
Mollusca.
Ceratobranchia
::
Ceratobranchia
(n. pl.) A group of
nudibranchiate
Mollusca
having
on the back
papilliform
or
branched
organs
serving
as
gills.
Hepato-pancreas
::
Hepato-pancreas
(n.) A
digestive
gland in
Crustacea,
Mollusca,
etc.,
usually
called
the
liver,
but
different
from the liver of
vertebrates..
Solenogastra
::
Solenogastra
(n. pl.) An order of lowly
organized
Mollusca
belonging
to the
Isopleura.
A
narrow
groove
takes the place of the foot of other
gastropods.
Incurrent
::
Incurrent
(a.)
Characterized
by a
current
which flows
inward;
as, the
incurrent
orifice
of
lamellibranch
Mollusca..
Epipodial
::
Epipodial
(a.)
Pertaining
to the
epipodium
of
Mollusca.
Molluscoidea
::
Molluscoidea
(n. pl.) A
division
of
Invertebrata
which
includes
the
classes
Brachiopoda
and
Bryozoa;
--
called
also
Anthoid
Mollusca.
Anthobranchia
::
Anthobranchia
(n. pl.) A
division
of
nudibranchiate
Mollusca,
in which the gills form a
wreath
or
cluster
upon the
posterior
part of the back. See
Nudibranchiata,
and
Doris..
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