- The
siphuncle is a
strand of
tissue p****ing
longitudinally through the s**** of a
cephalopod mollusk. Only
cephalopods with
chambered s**** have siphuncles...
- said to be
evolute (e.g., Dactylioceras). A thin
living tube
called a
siphuncle p****ed
through the septa,
extending from the ammonite's body into the...
- sections,
straight to
sinuous sutures, and a tubular,
generally central siphuncle.
Having survived relatively unchanged for
hundreds of
millions of years...
-
release of egg and sperm, in the
nautilus a
string of
tissue called the
siphuncle goes
through all the chambers, and the
eight plates that make up the s****...
-
perforated by the
siphuncle, a
fleshy tube
which runs
through each of the
internal chambers of the s****.
Surrounding the
fleshy tube of the
siphuncle are structures...
- some
gastropods was used in
support of this view. The
development of a
siphuncle would have
allowed the s**** of
these early forms to
become gas-filled...
- body
chamber transversely constricted, and a
subcentral orthochoanitic siphuncle. The
surface is
ornamented by a
network of fine
lirae (Sweet 1964:K224)...
- of concavo-convex
chambers linked by a centrally-placed tube
called a
siphuncle.
There is a
tendency for the
chambers to
develop cameral deposits, which...
-
deeper water, and
could inhabit depths greater than 100–200 m. The wide-
siphuncled Actinocerida and the
Discocerida both
emerged during the Darriwilian....
- the
genus Nanno in that the
siphuncle in
Nanno fills the
entire apical portion of the s****
while in
Endoceras the
siphuncle is
ventral even
there with...
