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siphuncle

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Journal Article
Journal: PALAIOS
Published: 01 March 2017
PALAIOS (2017) 32 (3): 153-157.
...ALEKSANDR A. MIRONENKO Abstract Ammonoid soft tissues are rarely preserved and such findings are of considerable interest. Extremely little is known about the structure of ammonoid siphuncle soft-parts. Until now indisputable fossilized siphuncle soft tissues were known only in a few ammonoid...
FIGURES | View All (4)
Journal Article
Journal: Paleobiology
Published: 01 January 2005
Paleobiology (2005) 31 (2): 233-252.
... by their dorsal siphuncle, contrasted to a ventral siphuncle in almost all other ammonoids. Comparisons of a sample of Clymeniida ( n = 22 genera), Goniatitida ( n = 33), Prolecanitida ( n = 12), and Anarcestida ( n = 13) indicate that clymeniids fall within the range of other ammonoids in terms of shell geometry...
FIGURES | View All (15)
Journal Article
Journal: Paleobiology
Published: 01 October 1982
Paleobiology (1982) 8 (4): 426-433.
Journal Article
Published: 01 January 1943
Journal of Paleontology (1943) 17 (1): 1-25.
Journal Article
Published: 01 March 2010
Journal of Paleontology (2010) 84 (2): 267-287.
... in a major change in form of the skeleton. The animal produced a large skeleton (to 180 mm in length and 50 mm in diameter) with endogastric coiling, oblique septa and a very large siphuncle. The skeleton has a guard with a solid posterior prong, a posteroventral corona plate and a noded dorsal shield...
FIGURES | View All (11)
Image
Phosphatized remnants of soft tissues inside the <b>siphuncle</b> tubes of  Kachpu...
in > PALAIOS
Published: 01 March 2017
Fig. 1.— Phosphatized remnants of soft tissues inside the siphuncle tubes of Kachpurites fulgens . A ) MSU 123/5, Eganovo locality. Remnants of cameral membranes are visible along the sides of the siphuncle tube. B ) MSU 123/6 Eganovo locality. Abbreviations: sp = septum; phl = phosphatic
Image
Chemical composition of fossilized <b>siphuncle</b> soft tissues of  Kachpurites f...
in > PALAIOS
Published: 01 March 2017
Table 1.— Chemical composition of fossilized siphuncle soft tissues of Kachpurites fulgens (MSU 123/1) .
Image
Ammonite referable to the suborder Lytoceratina; the phosphatic <b>siphuncle</b> i...
Published: 01 February 2010
Fig. 4 Ammonite referable to the suborder Lytoceratina; the phosphatic siphuncle is clearly visible. Ammonite riferibile al subordine Lytoceratina; si vede molto bene il sifone fosfatico.
Image
Camera lucida drawings of details of <b>siphuncle</b> and septal necks of cephalop...
Published: 09 May 2008
Figure 12. Camera lucida drawings of details of siphuncle and septal necks of cephalopods from the Rochdale Formation (Stairsian) of New York. (a) Bassleroceras vassarina ( Dwight, 1884 ), same specimen as in Figure 13d . (b) Paraendoceras wappingerense ( Ulrich et al. 1944 ), same
Image
Figure  6 —Frequency distribution of position of the <b>siphuncle</b> ( ps ) for 2...
Published: 01 September 2005
Figure 6 —Frequency distribution of position of the siphuncle ( ps ) for 207 specimens of Mooreoceras normale or Pseudorthoceras knoxense . There is no evidence for a concentration of siphuncle positions other than subcentral, but several deviations from the mean occur toward the center
Image
Figure  10. Comparison plots of areal (A) and linear (B) <b>siphuncle</b> size dat...
Published: 01 January 2005
Figure 10. Comparison plots of areal (A) and linear (B) siphuncle size data for Anarcestida, Prolecanitida, Goniatitida, and Clymeniida (gonioclymeniins and clymeniins plotted separately). A, Siphuncle cross-section area/ whorl cross-section area (SI/A); B, Siphuncle diameter/shell diameter (SD/DM
Image
Figure  11. Bivariate plots of <b>siphuncle</b> cross-section area (SI) versus who...
Published: 01 January 2005
Figure 11. Bivariate plots of siphuncle cross-section area (SI) versus whorl cross-section area (A) for Anarcestida, Prolecanitida, Goniatitida, and Clymeniida (gonioclymeniins and clymeniins plotted separately). Correlations as follows: Goniatitida ( r 2 = 0.725, p < 0.0001); Prolecanitida
Image
Figure  13. Plots of calculated <b>siphuncle</b> surface area (SSA) versus shell d...
Published: 01 January 2005
Figure 13. Plots of calculated siphuncle surface area (SSA) versus shell diameter (DM) in clymeniids (A) compared with prolecanitids, goniatitids, and anarcestids (B) with cubic spline curves fitted to data (lambda = 1000). (For reference, non-clymeniid curve from B is superimposed on A.) Note
Image
Figure  4 —<b>Siphuncle</b> morphology of  Yinoceras  and  Pseudohalorites. 1 , Lo...
Published: 01 May 2002
Figure 4 —Siphuncle morphology of Yinoceras and Pseudohalorites. 1 , Longitudinal cross section of Pseudohalorites sp. (NIGP 132279), D 21.1 mm, showing retrochoanitic septal necks with diameters one-fifth corresponding whorl height, and position of siphuncle within the dorsal septal flexure
Journal Article
Published: 01 December 1968
Journal of Sedimentary Research (1968) 38 (4): 1387-1389.
...Richard A. Reyment Abstract The vertical orientations of shells of Rhynchorthoceras in Lower Ordovician limestone at Satatorp, Vastergotland, Sweden indicate that these shells stranded in unconsolidated carbonate sediment in shallow water. The mean position for the siphuncle, which takes up 1/6...
Series: GSA Memoirs
Published: 01 January 1949
DOI: 10.1130/MEM41-p1
... of the coiled forms. Most of the straight (and the slightly curved) ones have cyrtochoanitic siphuncles, but a few of these and all of the coiled ones are orthochoanites. Altogether about a hundred species of nautiloids are known from the Permian of the Americas. On the basis of the structure of the siphuncle...
Series: GSA Memoirs
Published: 01 January 1947
DOI: 10.1130/MEM23-p1
... to be rare indeed in the Pliocene. Locally they are abundant in the Early Tertiary of southeastern United States and northwestern Peru, but elsewhere they are sporadic. All have nautiliconic conchs and orthochoanitic siphuncles and none bears prominent ornamentation. Modern Nautilus, which extends back...
Series: GSA Special Papers
Published: 01 January 1942
DOI: 10.1130/SPE37-p1
... nautilicones are rather unspecialized forms with orthochoanitic siphuncles. They vary chiefly in the shape of the conch and the position of the siphuncle. Primarily on the basis of these features, they have been placed in four families: the Deltoceratidae, Plectoceratidae, Tarphyceratidae, and Trocholitidae...
Image
Phosphatized epithelium of the <b>siphuncles</b> of  Kachpurites fulgens .  A ,  B...
in > PALAIOS
Published: 01 March 2017
Fig. 2.— Phosphatized epithelium of the siphuncles of Kachpurites fulgens . A , B ) MSU 123/4. C , D ) MSU 123/3. Both specimens are from Eganovo locality. Abbreviations: st = siphuncle tube; s = siphuncle soft tissues; se = siphuncle epithelium.
Image
Cross-section of  Kachpurites fulgens  <b>siphuncles</b> with preserved blood vess...
in > PALAIOS
Published: 01 March 2017
Fig. 3.— Cross-section of Kachpurites fulgens siphuncles with preserved blood vessels. A large central vein and four smaller arteries are visible. Eganovo locality. A ) MSU 123/1. B ) MSU123/2. Abbreviations: st = siphuncle tube; s = siphuncle soft tissues; a = artery; v = vein; cm = cameral