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 mollusc. 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...
- Devonian. Discosorids are unique in the structure and formation of the siphuncle, the tube that runs through and connects the camerae (chambers) in cephalopods...
- body chamber transversely constricted, and a subcentral orthochoanitic siphuncle. The surface is ornamented by a network of fine lirae (Sweet 1964:K224)...
- sections, straight to sinuous sutures, and a tubular, generally central siphuncle. Having survived relatively unchanged for hundreds of millions of years...
- s**** are endogastric and strongly compressed, such that the ventral or siphuncle side is curved inward and the dorso-ventral height is greater than the...
- from the side) that has no hyponomic sinus and a central to subcentral siphuncle composed of subquadrate to nummuloidal segments in which the septal necks...
- 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...
- siphuncle. The siphuncle in both Solenochilus and Acanthonautilus is ventral, running just inside the outer rim of the s****. In both the siphuncle is...
- rather similar, but differ in the details of the siphuncle. Acaroceras, the earlier of the two, has a siphuncle composed of short straight septal necks and...