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Topic: Siphuncle

	Siphuncle - Wikipedia, the free encyclopedia
		The siphuncle is a strand of tissue passing longitudinally through the shell of a cephalopod mollusk.
		In the case of the cuttlefish, the siphuncle is indistinct and connects all the small chambers of that animal's highly modified shell; in the other cephalopods it is thread-like and passes through small openings in the walls dividing the chambers of the shell.
		In living cephalopods the siphuncle is used primarily in emptying water from new chambers as the shell grows.
	en.wikipedia.org /wiki/Siphuncle (463 words)

	Nautiloid - Wikipedia, the free encyclopedia
		These are the internal chambers, the siphuncle and the sutures of the shell, features that are also found in the shells of all ammonoids.
		The septa were perforated by the siphuncle, which ran through each of the internal chambers of the shell.
		Surrounding the fleshy tube of the siphuncle were structures made of calcium carbonate: septal necks and connecting rings.
	en.wikipedia.org /wiki/Nautiloid (1799 words)

	Cephalopoda (Site not responding. Last check: 2007-10-25)
		Classification of cephalopods is based largely on shell morphology, suture presence and patterns, and siphuncle characteristics.
		Siphuncle large and usually occupying at least one-fourth of the diameter of the shell; position variable.
		Siphuncle large, as much as one-half of the diameter of the body chamber, marginal to sub-central in position.
	www.cox-internet.com /coop/cephalopoda.html (2112 words)

	Nautiloids: The First Cephalopods (Site not responding. Last check: 2007-10-25)
		The siphuncle tends to be centrally placed with most nautiloids and is often wider than the ammonoids, and with the ammonoids the siphuncle is usually located near the outer margin of the shell, the venter.
		Gases arising from the decomposition of the carcass tend to expel water from the shell and the dead animal tends to rise to the surface, held buoyant by the gases retained in the chambers.
		After the body decays, the remaining water is expelled from the siphuncle into the living chamber and the shell is free to drift as to wherever the tide takes it.
	www.tonmo.com /science/fossils/nautiloids.php (5326 words)

	The clymeniid dilemma: functional implications of the dorsal siphuncle in clymeniid ammonoids -- Gottobrio and Saunders ...
		The clymeniid dilemma: functional implications of the dorsal siphuncle in clymeniid ammonoids -- Gottobrio and Saunders 31 (2): 233 -- Paleobiology
		The clymeniid dilemma: functional implications of the dorsal siphuncle in clymeniid ammonoids
		of the siphuncle to the dorsal side of the shell occurs suddenly
	paleobiol.geoscienceworld.org /cgi/content/abstract/31/2/233 (294 words)

	Rashed.html (Site not responding. Last check: 2007-10-25)
		The short-lived, extremely diverse clade of Upper Devonian (Famennian) ammonoids which belong to the order Clymeniida are unique among the thousands of other ammonoid genera in positioning the siphuncle on the dorsal side of the shell, contrary to a ventrally located siphuncle in all other ammonoids.
		A functional explanation for the dorsal siphuncle has always been a mystery, and because of the rarity of specimens, adequate material to conduct meaningful research of this group has been unavailable.
		Polished axial and sagittal cross-sections of 62 specimens of clymeniid ammonoids from the Ural Mountains of the former Soviet Union were prepared in order to study the internal morphology of each conch in detail.
	www.brynmawr.edu /Acads/Physics/grad/grad01/gottobrio.html (178 words)

	clymeniid dilemma: functional implications of the dorsal siphuncle in clymeniid ammonoids, The Paleobiology - Find ...
		Thus, the dorsal location of the siphuncle in clymeniids and the ventral siphuncle location in the goniatitids may have each been the optimal locations for chamber liquid removal, given the different body chamber lengths, siphuncle positions, and chamber orientations in the two groups.
		And, needless to say, the hydrostatics of an extremely diverse clade of ammonoids, containing scores of genera and hundreds of species, cannot be generalized on the basis of 15 simulations.
		Enlarged siphuncles seem to have partially and, in some cases, fully compensated for volume and surface area reductions by their shortened dorsal location.
	www.findarticles.com /p/articles/mi_qa4067/is_200504/ai_n14681493/pg_14 (439 words)

	Ordovician Nautiloids of Argentina
		Hemichoanítics septal neck with circular to subcircular siphuncle, Diameter is 4 mm.
		Ventral siphuncle (1/3 diameter of the shell) with endosiphuncular tube, septal necks macrochoanitic.
		Cameroceras sp.) with large-diameter tubular siphuncles, nearly complete shells are parallel to the bedding planes, with phragmacones of a maximum observed shell diameter of 9 cm.
	www.unt.edu.ar /fcsnat/INSUGEO/geologia_16/08-Acenolaza.htm (4493 words)

	NMBGMR Memoir 10 (Site not responding. Last check: 2007-10-25)
		The genus possesses a nonsegmental lining in the siphuncle, thickening gently apicad-like very slender endocones, which may terminate in a narrow tube that may be traversed by diaphragms.
		Buttsoceras actually develops within its siphuncle a lining, thickening gently apicad; under slight silicification, shell wall, septa, the exterior of the siphuncle, and the inner surface of the lining are replaced, but the main mass of the lining remains calcareous.
		The condition is analogous to that noted by Yochelson in Palliseria, in which the thick shell wall, being silicified on the outer and inner surfaces, presents the deceptive aspect of being composed of three original layers.
	geoinfo.nmt.edu /publications/memoirs/10/home.html (896 words)

	cephalopoda lab (Site not responding. Last check: 2007-10-25)
		One of the three has a very large siphuncle and may be an endoceratoid, but the topmost siphuncle section is well preservered and appears to have annulosiphuncular deposits, which are characteristic of the actinoceratoids.
		The swollen (cyrtochoantic) siphuncle is clearly visible on this polished specimen.
		The siphuncle is relatively narrow, so it isnot an actinoceratoid or endoceratoid.
	www.earth.rochester.edu /ees207/cephalopods.html (275 words)

	Ammonite Structure And Classification
		There is a siphuncle, a tube used for propulsion and buoyancy.
		The location of the siphuncle is not like the nautilus.
		It is the pattern created by the folds, along with the position of the siphuncle that is the basis of classification.
	www.fossils-facts-and-finds.com /ammonite.html (394 words)

	paleolab8molluscapart2
		Connecting each of the septa is a fleshy tube that passes through the septal walls called the siphuncle, which through osmotic regulation can adjust the fluids and gases in the chambers, which in turn affects the buoyancy of the organism.
		In some cases, as in the Nautiloidea and the Endoceratoidea, the siphuncle passes through the central part of the septa, whereas in other cases, as in the Ammonoidea and the Bactritoidea, the siphuncle passes through the lower (ventral) area of the septa.
		Septal walls (and sutures) are straight, siphuncle passes through the central part of the septal walls, often calcareous deposits are observable in the chambers that probably served as ballast.
	www.personal.kent.edu /~alisonjs/paleo/paleolab8molluscapart2.htm (1045 words)

	Shopping - Products by Point To Shop online store (Site not responding. Last check: 2007-10-25)
		The animal lives in the largest and newest chamber, with a tubular elongation of the body, known as the siphuncle, extending through the septa to the apex of the shell.
		The siphuncle removes liquid from the chambers and replaces it with gas, giving the animal the buoyancy that permits it to swim (backwards except when feeding), which it accomplishes by ejecting water through a funnel.
		The nautilus breathes by means of two pairs of gills; it feeds on crabs and other animals, which it catches with its long, slender tentacles (numbering more than 90) that encircle the mouth.
	www.fortune3.com /point/Products-314-.html (3342 words)

	Spirula spirula
		The shell, which retains the phragmocone and siphuncle of its distant ancestors, is used as a buoyancy device.
		The posterior position of the shell within the body causes the animal to generally orient vertically with the head downward.
		Calcareous shell a phragmocone, curved ventrally in open planispiral; round in cross section and possessing a ventral siphuncle and transverse septa.
	tolweb.org /tree?group=Spirula_spirula&contgroup=Sepioid_families (1085 words)

	Fossil Cephalopods
		These chambers are connected by a channel, the siphuncle, through which a strand of tissue well supplied with blood runs all the way from the tip of the shell to the body of the cephalopod itself.
		The chambered shell with its connecting siphuncle is a unique characteristic of the Cephalopoda.
		While the siphuncle is runs through the centre of the shell in nautiloids, in both ammonoids and coleoids the siphuncle is ventral.
	is.dal.ca /~ceph/TCP/FosCephs.html (2321 words)

	The Ammonoidea are one of the three subclasses
		The Ammonoidea are one of the three subclasses or orders within the Cephalopoda, and are characterised by having chambered shells with complex septal walls, a ventral siphuncle, and a radula with nine teeth per row.
		The group is further subdivided into suborders, which are defined on the basis of features such as suture line complexity, the shape and position of the siphuncle and septal necks, and overall shell shape and ornamentation.
		In the Anarcestina, Goniatitina and Prolecanitina the siphuncle is ventral, as it is in coleoids, while the Clymeniina have a dorsal siphuncle like some nautiloids.
	www.fossiliensammlung-knecht.ch /classification-taxonomy.php (596 words)

	Orthoceras: Nautiloid of The Paleozoic Era
		The differences in the composition of these shell parts allowed for differences in fossilization so the parts can be seen.
		The siphuncle is a tube that runs the entire length of the shell, through each of the chambers.
		The siphuncle is the line running down the center from head to tail.
	www.fossils-facts-and-finds.com /orthoceras.html (260 words)

	more Hollingworth ammonite - TONMO.com Forums
		Why is the siphuncle not seen attached to the ventral posterior part of the living chamber?
		In fact the whole shell in a cuttlefish is one big siphuncle.
		There is tissue going through the whole thing and that's why it has thousands of tiny chambers instead of a just a few big ones like an ammonite or nautilus.
	www.tonmo.com /forums/showthread.php?t=1417 (274 words)

	GFF-online presents: Siphuncular structure in a Silurian narthecoceratid nautiloid cephalopod from the Island of Gotland
		Mutvei, H. Siphuncular structure in a Silurian narthecoceratid nautiloid cephalopod from the Island of Gotland
		Narthecoceratidae), embedded in the Llandoverian Lower Visby mudstone on the Island of Gotland, Sweden, consists mainly of isolated siphuncles.
		The growth lines in the deposit are, therefore, in varying degrees oblique to the long axis of the siphuncle or, in some places, practically perpendicular to this axis.
	www.gff-online.se /site/article.asp?articleID=480 (242 words)

	Avalon Natural Treasures Fossil collections
		This large Cambrian trilobite was swimming the oceans around 500 million years ago.
		This nautiloid from the Cretaceous is in beautiful condition- polished, showing lateral plates and has the end of its siphuncle protruding.
		The siphuncle is the tube that runs through the centre of the shell, which the nautiloids used to move air in and out of chambers to alter their bouyancy.
	www.avalontreasures.com /fossils3.htm (466 words)

	FanFiction.Net : Dictionary & Thesaurus (Site not responding. Last check: 2007-10-25)
		Siphon cup, a cup with a siphon attached for carrying off any liquid in it; specifically (Mach.), an oil cup in which oil is carried over the edge of a tube in a cotton wick, and so reaches the surface to be lubricated.
		[1913 Webster] From The Collaborative International Dictionary of English v.0.48 : Siphuncle \Si"phun`cle\, n.
		See Siphon.] (Zool.) The tube which runs through the partitions of chambered cephalopod shells.
	www.fanfiction.net /dictionary.php?word=siphuncle (320 words)

	InfoHub - Rayonnoceras - A Nautiloid of Long Ago
		Rayonnoceras differed from other Actinoceatids in that it had siphuncle segments that were smaller and globular.
		Rayonnoceras had a siphuncle which was complex and in a central position.
		Calcareous deposits filled the shell chamber and the siphuncle.
	www.infohub.com /forums/showthread.php?t=8003 (348 words)

	Cephalopoda Classification
		Members of this subclass resemble members of the ammonoidea subclass in that they have a bulbous protoconch and a small marginal siphuncle.
		Like the bactritoids, they have have a bulbous protoconch and a marginal siphuncle.
		They entered the fossil record in the Devonian and left in the Cretaceous at the famous K/T boundary.
	www.earth.rochester.edu /ees207/Cephalopoda/hardman_ceph3.html (442 words)

	Cephalopoda
		The dark, chitinous, bird-like beaks are visible on the surface of the white muscle mass.
		A longitudinal cut through the shell of the pearly nautilus (Nautilus sp.)showing the flotation chambers (phragmocone) and the siphuncle (partially lost from the larger chambers) that passes through the septa separating individual chambers.
		The shell has become internal and highly modified in most living cephalopods.
	tolweb.org /tree?group=Cephalopoda&contgroup=Mollusca (1080 words)

	siphonostomata Siphonostomata - definition of Siphonostomata by the Free Online ...
		Siphuncled All content on this website, including dictionary, thesaurus, literature, geography, and
		Stoneseed has largeheartedness groschen having hemicephalous would plenarium underfreight, postglacial having supermarket prefearful
		Sinologist - Skidpan Dictionary: Sinologist - Skidpan: Cant find what you want Ask your question here Siphonostomata Siphonostomatous Siphonostome Siphorhinal Siphorhinian Siphuncle Siphuncled Siphuncular
	teratomas.blog7.theauctionblog.com /1143725630.html (801 words)

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