echinodermata
n . 棘皮动物
棘皮动物
Echinodermata n 1 :
radially symmetrical marine invertebrates including e .
g .
starfish and sea urchins and sea cucumbers [
synonym :
{
Echinodermata }, {
phylum Echinodermata }]
Echinodermata \
E *
chi `
no *
der "
ma *
ta \
([-
e ]*
k [
imac ]`
n [-
o ]*
d [~
e ]
r "
m [.
a ]*
t [.
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n .
pl . [
NL .,
fr .
Gr .
'
echi ^
nos hedgehog ,
sea urchin de `
rma , -
atos ,
skin .]
(
Zo ["
o ]
l .)
One of the grand divisions of the animal kingdom .
By many writers it was formerly included in the Radiata . [
Written also {
Echinoderma }.]
[
1913 Webster ]
Note :
The species usually have an exterior calcareous skeleton ,
or shell ,
made of many pieces ,
and often covered with spines ,
to which the name .
They may be star -
shaped ,
cylindrical ,
disk -
shaped ,
or more or less spherical .
The body consists of several similar parts (
spheromeres )
repeated symmetrically around a central axis ,
at one end of which the mouth is situated .
They generally have suckers for locomotion .
The group includes the following classes :
Crinoidea ,
Asterioidea ,
Ophiuroidea ,
Echinoidea ,
and Holothurioidea .
See these words in the Vocabulary ,
and also {
Ambulacrum }.
[
1913 Webster ]
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