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siphuncle

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siphuncle
siphuncle Zool. (ˈsaɪfʌŋk(ə)l) [ad. L. sīphunculus, dim. of sīpho siphon.] 1. A small canal or tube traversing and connecting the shell-chambers in certain cephalopods; = siphunculus, and siphon n. 3 a.1822 J. Parkinson Outl. Oryctol. 161 The most important part of this organ, the continuous siphunc... Oxford English Dictionary
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Bisonocerida
The inner surface of the siphuncle contains endosiphuncular deposits, which help distinguish the two orders. In cross-section, they are composed of several bulbous calcareous crests extending into the siphuncle. wikipedia.org
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Solenochilus
In both the siphuncle is mostly composed of thin connecting rings. The siphuncle in Solenochilus is wider and has a more sinuous profile than that of Acanthonautilus. wikipedia.org
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Discosorida
with segments that extend into the adjacent chambers, and parietal deposits within the siphuncle that overlap to form endocones. Families differ primarily in the structural details of the siphuncle and in the nature of the aperture. wikipedia.org
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How do we know that ammonites are a kind of cephalopod rather than another type of mollusc? On a recent fossil hunting trip, I found a small fossil that an expert identified for me as an ammonite beak. He told me such...
It really is mostly the siphuncle as @augurar mentioned. The siphuncle is present in modern ammonites, cuttlefish, and Spirula(a deep-sea squid with an internal chambered shell).
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Simardoceras
The siphuncle is ventral. Segments are subquadrate in outline and are longer than broad. Connecting rings are thick. Although Simardoceras somewhat resembles Winnipegoceras is the form of its siphuncle, it differs in its very broad cross section. wikipedia.org
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Tarphyceras
Tarphyceras is a genus of tarphyceratid with whorls rounded in cross section, having a deeply impressed dorsum and a ventral to subcentral siphuncle, , and from Trocholites in that although Trocholites is subcircular in cross section, the siphuncle is subdorsal. wikipedia.org
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Bajkaloceras
Description Bajkaloceras is characterized by an orthonic shell with an elliptical cross section and short camerae and a large, central to subctral siphuncle Flower (1976) separated these into two groups, calling attention to differences in siphuncle morphology and location. wikipedia.org
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Williamsoceras
Description Of the five described species the siphuncle wall and phragmocone are known only from the genotype Williamsoceras adnatum. in cross section closer to the apex of the siphuncle where it becomes draped by endocones. wikipedia.org
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Syringonautilidae
The siphuncle is subcentral. The surface is ornamented with fine lirae. The siphuncle is subcentral. wikipedia.org
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Konglungenoceras
septal foramina grasping bullettes at the adapical end of the connecting rings. shells are endogastric and strongly compressed, such that the ventral or siphuncle Endosiphuncular deposits in the apical portion of the siphuncle consist of thick overlapping parietal laminae that form endocones, similar to those is wikipedia.org
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Murrayoceras
As originally perceived Murrayoceras included species differing in siphuncle profile. Those in which the siphuncle segments are externally convex were redefined as Cartersoceras., leaving Murrayoceras with those having essentially straight wikipedia.org
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Tarphyceratidae
Mature siphuncle subcenral. Siphuncle fairly large, submarginal. wikipedia.org
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Yinoceras
The retrochoanitic siphuncle is more usual for earlier, Devonian, ammonoids and is a characteristic of the Nautiloidea. The dorsal siphuncle, characteristic of the Upper Devonian Clymeniida may say something about the orientation of Yinoceras during life. wikipedia.org
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Turnoceras
Conostichoceras is similar externally, but has a siphuncle with a trapezoidal aspect to its siphuncle segments. Perimecoceras has similar concave siphuncle segments but is tubular in form. wikipedia.org
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