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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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Cephalata
::
Cephalata
(n. pl.) A large
division
of
Mollusca,
including
all
except
the
bivalves;
-- so
called
because
the head is
distinctly
developed.
See
Illustration
in
Appendix..
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..
Opisthobranchiata
::
Opisthobranchiata
(n. pl.) A
division
of
gastropod
Mollusca,
in which the
breathing
organs
are
usually
situated
behind
the
heart.
It
includes
the
tectibranchs
and
nudibranchs..
Conchology
::
Conchology
(n.) The
science
of
Mollusca,
and of the
shells
which they form;
malacology..
Molluscous
::
Molluscous
(a.)
Molluscan.
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.
Mollusk
::
Mollusk
(n.) One of the
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..
Cephalopoda
::
Cephalopoda
(n. pl.) The
highest
class of
Mollusca.
Ostrea
::
Ostrea
(n.) A genus of
bivalve
Mollusca
which
includes
the true
oysters.
Gastropoda
::
Gastropoda
(n. pl.) One of the
classes
of
Mollusca,
of great
extent.
It
includes
most of the
marine
spiral
shells,
and the land and
fresh-water
snails.
They
generally
creep by means of a flat,
muscular
disk, or foot, on the
ventral
side of the body. The head
usually
bears one or two pairs of
tentacles.
See
Mollusca..
Molluscan
::
Molluscan
(a.) Of or
pertaining
to
mollusks.
Bojanus Organ
::
Bojanus
organ () A
glandular
organ of
bivalve
mollusca,
serving
in part as a
kidney..
Odontoblast
::
Odontoblast
(n.) One of the cells which
secrete
the
chitinous
teeth of
Mollusca.
Bivalve
::
Bivalve
(n.) A
mollusk
having
a shell
consisting
of two
lateral
plates
or
valves
joined
together
by an
elastic
ligament
at the
hinge,
which is
usually
strengthened
by
prominences
called
teeth.
The shell is
closed
by the
contraction
of two
transverse
muscles
attached
to the inner
surface,
as in the clam, -- or by one, as in the
oyster.
See
Mollusca..
Lamellibranchiata
::
Lamellibranchiata
(n. pl.) A class of
Mollusca
including
all those that have
bivalve
shells,
as the
clams,
oysters,
mussels,
etc..
Osphradium
::
Osphradium
(n.) The
olfactory
organ of some
Mollusca.
It is
connected
with the organ of
respiration.
Stomatoplastic
::
Stomatogastric
(a.) Of or
pertaining
to the mouth and the
stomach;
as, the
stomatogastric
ganglion
of
certain
Mollusca..
Streptothrix
::
Streptoneura
(n. pl.) An
extensive
division
of
gastropod
Mollusca
in which the loop or
visceral
nerves
is
twisted,
and the sexes
separate.
It is
nearly
to
equivalent
to
Prosobranchiata..
Pteropoda
::
Pteropoda
(n. pl.) A class of
Mollusca
in which the
anterior
lobes of the foot are
developed
in the form of
broad,
thin,
winglike
organs,
with which they swim at near the
surface
of the sea..
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