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Definition of echinoderm
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 echinoderm is as below...
Echinoderm
(n.) One of the
Echinodermata.
Lern More About Echinoderm
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Bivium
::
Bivium
(n.) One side of an
echinoderm,
including
a pair of
ambulacra,
in
distinction
from the
opposite
side
(trivium),
which
includes
three
ambulacra..
Starfish
::
Starfish
(n.) Any one of
numerous
species
of
echinoderms
belonging
to the class
Asterioidea,
in which the body is
star-shaped
and
usually
has five rays,
though
the
number
of rays
varies
from five to forty or more. The rays are often long, but are
sometimes
so short as to
appear
only as
angles
to the
disklike
body.
Called
also sea star,
five-finger,
and
stellerid..
Echinozoa
::
Echinozoa
(n. pl.) The
Echinodermata.
Trivium
::
Trivium
(n.) The three
anterior
ambulacra
of
echinoderms,
collectively..
Madreporite
::
Madreporite
(n.) The
madreporic
plate of
echinoderms.
Sublapsarian
::
Subkingdom
(n.) One of the
several
primary
divisions
of
either
the
animal,
or
vegetable
kingdom,
as, in
zoology,
the
Vertebrata,
Tunicata,
Mollusca,
Articulata,
Molluscoidea,
Echinodermata,
Coelentera,
and the
Protozoa;
in
botany,
the
Phanerogamia,
and the
Cryptogamia..
Umbo
::
Umbo (n.) A boss, or
rounded
elevation,
or a
corresponding
depression,
in a
palate,
disk, or
membrane;
as, the umbo in the
integument
of the
larvae
of
echinoderms
or in the
tympanic
membrane
of the ear..
Stelleridan
::
Stellerida
(n. pl.) An
extensive
group of
echinoderms,
comprising
the
starfishes
and
ophiurans..
Crinoidea
::
Crinoidea
(n. pl.) A large class of
Echinodermata,
including
numerous
extinct
families
and
genera,
but
comparatively
few
living
ones. Most of the
fossil
species,
like some that are
recent,
were
attached
by a
jointed
stem. See
Blastoidea,
Cystoidea,
Comatula..
Ossicle
::
Ossicle
(n.) One of
numerous
small
calcareous
structures
forming
the
skeleton
of
certain
echinoderms,
as the
starfishes..
Periproct
::
Periproct
(n.) The
region
surrounding
the anus,
particularly
of
echinoderms..
Echinoderm
::
Echinoderm
(n.) One of the
Echinodermata.
Asterias
::
Asterias
(n.) A genus of
echinoderms.
Annuloida
::
Annuloida
(n. pl.) A
division
of the
Articulata,
including
the
annelids
and
allied
groups;
sometimes
made to
include
also the
helminths
and
echinoderms..
Echinus
::
Echinus
(n.) A genus of
echinoderms,
including
the
common
edible
sea
urchin
of
Europe..
Sea Urchin
::
Sea
urchin
() Any one of
numerous
species
of
echinoderms
of the order
Echinoidea.
Echinoidea
::
Echinoidea
(n. pl.) The class
Echinodermata
which
includes
the sea
urchins.
They have a
calcareous,
usually
more or less
spheroidal
or
disk-shaped,
composed
of many
united
plates,
and
covered
with
movable
spines.
See
Spatangoid,
Clypeastroid..
Interambulacrum
::
Interambulacrum
(n.) In
echinoderms,
one of the areas or zones
intervening
between
two
ambulacra.
See
Illust.
of
Ambulacrum..
Echinodermata
::
Echinodermata
(n. pl.) One of the grand
divisions
of the
animal
kingdom.
By many
writers
it was
formerly
included
in the
Radiata.
Fission
::
Fission
(n.) A
process
by which
certain
coral
polyps,
echinoderms,
annelids,
etc.,
spontaneously
subdivide,
each
individual
thus
forming
two or more new ones. See
Strobilation..
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