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...
- typically had ventral siphuncles like ammonites, although often proportionally larger and more internally structured. The word "siphuncle" comes from the New...
- sections, straight to sinuous sutures, and a tubular, generally central siphuncle. Having survived relatively unchanged for millions of years, nautiluses...
- twists the internal organs so the **** lies above the head.   = Septa   = Siphuncle Volbort****a, some fossils of which predate 530 million years ago, was...
- body chamber transversely constricted, and a subcentral orthochoanitic siphuncle. The surface is ornamented by a network of fine lirae (Sweet 1964:K224)...
- perforated by the siphuncle, which runs through each of the internal chambers of the s****. Surrounding the fleshy tube of the siphuncle are structures made...
- twists the internal organs so the **** lies above the head.   = Septa   = Siphuncle Volbort****a, some fossils of which predate 530 million years ago, was...
- Devonian. Discosorids are unique in the structure and formation of the siphuncle, the tube that runs through and connects the camerae (chambers) in cephalopods...
- Cephalopoda. The absence of this siphuncle has been taken as evidence against cephalopod ancestry – how, it is argued, could a siphuncle evolve to penetrate existing...
- aragonite. It is a chambered, gas-filled s**** used for buoyancy control; its siphuncle is highly modified and is on the ventral side of the s****. The microscopic...
Loading...