Definition of siphuncle. Meaning of siphuncle. Synonyms of siphuncle

Here you will find one or more explanations in English for the word siphuncle. Also in the bottom left of the page several parts of wikipedia pages related to the word siphuncle and, of course, siphuncle synonyms and on the right images related to the word siphuncle.

Definition of siphuncle

siphuncle
Siphon Si"phon, n. [F. siphon, L. sipho, -onis, fr. Gr. ??? a siphon, tube, pipe.] 1. A device, consisting of a pipe or tube bent so as to form two branches or legs of unequal length, by which a liquid can be transferred to a lower level, as from one vessel to another, over an intermediate elevation, by the action of the pressure of the atmosphere in forcing the liquid up the shorter branch of the pipe immersed in it, while the continued excess of weight of the liquid in the longer branch (when once filled) causes a continuous flow. The flow takes place only when the discharging extremity of the pipe ia lower than the higher liquid surface, and when no part of the pipe is higher above the surface than the same liquid will rise by atmospheric pressure; that is, about 33 feet for water, and 30 inches for mercury, near the sea level. 2. (Zo["o]l.) (a) One of the tubes or folds of the mantle border of a bivalve or gastropod mollusk by which water is conducted into the gill cavity. See Illust. under Mya, and Lamellibranchiata. (b) The anterior prolongation of the margin of any gastropod shell for the protection of the soft siphon. (c) The tubular organ through which water is ejected from the gill cavity of a cephaloid. It serves as a locomotive organ, by guiding and confining the jet of water. Called also siphuncle. See Illust. under Loligo, and Dibranchiata. (d) The siphuncle of a cephalopod shell. (e) The sucking proboscis of certain parasitic insects and crustaceans. (f) A sproutlike prolongation in front of the mouth of many gephyreans. (g) A tubular organ connected both with the esophagus and the intestine of certain sea urchins and annelids. 3. A siphon bottle. Inverted siphon, a tube bent like a siphon, but having the branches turned upward; specifically (Hydraulic Engineering), a pipe for conducting water beneath a depressed place, as from one hill to another across an intervening valley, following the depression of the ground. Siphon barometer. See under Barometer. Siphon bottle, a bottle for holding a["e]rated water, which is driven out through a bent tube in the neck by the gas within the bottle when a valve in the tube is opened; -- called also gazogene, and siphoid.
Siphuncle
Siphuncle Si"phun`cle, n. [L. siphunculus, sipunculus, dim. of sipho. See Siphon.] (Zo["o]l.) The tube which runs through the partitions of chambered cephalopod shells.

Meaning of siphuncle from wikipedia

- 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...
- 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...
- 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****...
- Agonititida. Agoniatitids are primitive ammonoids with a ventral retrochoanitic siphuncle (septal necks point to the rear) reflective of their nautiloid ancestors...
- to some gastropods was used to support this view. The development of a siphuncle would have allowed the s**** of these early forms to become gas-filled...
- 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...
- body chamber transversely constricted, and a subcentral orthochoanitic siphuncle. The surface is ornamented by a network of fine lirae (Sweet 1964:K224)...
- from North America, belonging to the family Endoceratidae, in which the siphuncle takes up the entire apex. Foestellites, named by Kobayashi, 1940, is based...