វគ្គជំនាញកុំព្យូទ័រ
ចំណេះដឹងទូទៅ
ម្ហូបអាហារ
កំប្លែង
ទស្សន៍ទាយ
តូច
មធ្យម
ធំ
Tunicata
Same as:
urochorda
ENGLISH MEANING
noun
1.
(PLURAL)
A
grand
division
of the
animal
kingdom
,
intermediate
, in
some
respects
,
between
the
invertebrates
and
vertebrates
, and by
some
writers
united
with the
latter
. They were
formerly
classed
with
acephalous
mollusks
. The
body
is
usually
covered
with a
firm
external
tunic
,
consisting
in
part
of
cellulose
, and having two
openings
, one for the
entrance
and one for the
exit
of
water
. The
pharynx
is
usually
dilated
in the
form
of a
sac
,
pierced
by
several
series
of
ciliated
slits
, and
serves
as a
gill
.