Origin of siphuncle
Examples from the Web for siphuncle
It is peculiar to the louse tribe (Pediculid), and it consists of the tubulet (Tubulus), and siphuncle (Siphunculus).An Introduction to Entomology: Vol. III (of 4)|William Kirby
Shell coiled in one plane, aperture wide and simple, siphuncle central.
Shell straight or curved, fusiform, aperture simple, siphuncle contracted at septa.
In Ammonoids the siphuncle is always marginal, and usually external.
The siphuncle in the Nautilus pierces the centres of the septa, and in fossil Nautiloids it is usually central or sub-central.