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2 edition of Endosiphuncular structures in Ordovician and Silurian cephalopods found in the catalog.

Endosiphuncular structures in Ordovician and Silurian cephalopods

Curt Teichert

Endosiphuncular structures in Ordovician and Silurian cephalopods

by Curt Teichert

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  • 21 Currently reading

Published by University of Kansas Paleontological Institute in Lawrence .
Written in English

    Places:
  • North America.
    • Subjects:
    • Cephalopoda, Fossil -- North America.,
    • Paleontology -- Ordovician.,
    • Paleontology -- Silurian.,
    • Paleontology -- North America.

    • Edition Notes

      StatementCurt Teichert and Rex E. Crick.
      SeriesThe University of Kansas paleontological contributions : Paper ; 71, University of Kansas paleontological contributions., 71.
      ContributionsCrick, Rex E., joint author.
      Classifications
      LC ClassificationsQE701 .K33 no. 71, QE806 .K33 no. 71
      The Physical Object
      Pagination13 p., [1] leaf of plates :
      Number of Pages13
      ID Numbers
      Open LibraryOL4856266M
      LC Control Number75621132

      Middle Ordovician – Late Ordovician,?Middle Silurian. Common Paleoecology Cameroceras is an extinct genus of nektobenthic carnivores. Identification in Hand Sample: Conch may exceed a diameter of 20cm and a length of cm; Siphuncle can be up to 10cm, at . Silurian nautiloid cephalopods of Sardinia have first been described and illustrated by Meneghini () in «Paléontologie de l’Île de Sardaigne» as part of the La Marmora’s book «Voyage en Sardaigne». About a century later, Serpagli and Gnoli () revised the fossil collection of.

      During the Ordovician Period, about million years ago, some straight cephalopods grew to be as long as 19 feet, although most were much shorter. Straight cephalopods were common in Ordovician and Silurian times; coiled ones became fairly common only by later Paleozoic times. We find both kinds in Pennsylvanian rocks in Illinois. Czechoslovakia. All of these cephalopods are part of a widespread boreal, or "arctic" fauna that spread southward into both North America and Europe several times during the Ordovician and Silurian. Rep-resentatives of this boreal fauna are, there-fore, of considerable value in interconti-nental correlations and undescribed forms.

      Evidence of original coloration has been detected in cephalopod fossils dating as far back as the Silurian; these orthoconic individuals bore concentric stripes, which are thought to have served as camouflage. Devonian cephalopods bear more complex color patterns, of unknown : Cephalopoda, Cuvier, Ordovician cephalopods of North America‎ (44 P) O Ordovician cephalopods of Ordovician cephalopods of Asia‎ (4 P) Ordovician cephalopods of South America‎ (3 P) Pages in category "Ordovician cephalopods" The following 70 pages are in this category, out of 70 total. This list may not reflect recent changes. A.


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Endosiphuncular structures in Ordovician and Silurian cephalopods by Curt Teichert Download PDF EPUB FB2

Get this from a library. Endosiphuncular structures in Ordovician and Silurian cephalopods. [Curt Teichert; Rex E Crick]. Endosiphuncular structures in Ordovician and Silurian cephalopods.

View/ Open. High resolution PDF (for higher quality images) (Mb) Lower resolution PDF (for faster downloading) (Mb) Issue Date Author. Teichert, Curt. Crick, Rex E. Publisher. The Paleontological Institute, The University of Kansas. The conical endosiphuncular deposits (endocones) of endocerids show extensive intraspecific vańation.

Morphologi-cal and stouctural differences in these deposits should therefore be used with caution in generic and specific diagnoses. K e y w o r d s: endocerids, structure, Ordovician, siphuncle, Nautilus, File Size: 2MB. The siphuncular structure in the Ordovician cephalopod Bactroceras avus is described and compared with that in the : Harry Mutvei.

THE UPPER ORDOVICIAN CEPHALOPODS OF THE OSLO AREA 3 from the Holochoanites and the Cyrtochoanites at!east partly from the Orthochoanites.

In this I can fully agree. A very interesting discussion of the phylogenetical relations of the oldest cephalopods has been given by ScHINDEWOLF () in connection with his studies of Volborthella.

THE SILURIAN CEPHALOPODA. The rocks are for the most part thinly bedded mudstones and shales, and are far richer in graptolites than those of any of the other zones.

Almost all the typical Ludlow forms are to be found in these beds. They are well exposed in the Elton Lane section, Cited by: 1.

The first systematic work on cephalopod fauna, from the Silurian outcrops, is dated to the Italian geologists Michele Gortani () and Paolo Vinassa de Regny () described 18 species of cephalopods from Italian side of the of the Carnic Alps. In. Endocones or endocone-like structures are known from a number of distantly related groups of ‘nautiloid’ cephalopods apart from the Endocerida, such as the Dissidocerida and the Discosorida.

Furthermore, siphonal structures that represent either conical endosiphuncular diaphragms (or possibly even endocones) occur in at least three different ellesmerocerid by: 5. Palaeogeographic distribution and diversity of cephalopods during the Cambrian–Ordovician transition Article (PDF Available) in Palaeoworld August with Reads How we measure 'reads'.

Introduction. There is dispute with the timing of the earliest appearance of cephalopods. The problematic middle Cambrian animal Nectocaris pteryx from Burgess Shale, along with the problematic lower Cambrian taxa Petalilium and (probably) Vetustovermis, were interpreted as primitive, non-mineralized cephalopods (Smith and Caron, ).However, this interpretation was not supported by Cited by: 2.

Introduction. During the Ordovician the global marine biodiversity tripled, the biocomplexity drastically increased and the long-lasting called Palaeozoic biodiversity plateau was established (Sepkoski,Droser and Sheehan,Webby, a, Harper, ) The dynamics of this Great Ordovician Biodiversification can be understood in the context of palaeogeography such as changing Cited by: Siphuncular structure in Silurian discosorid and ascocerid nautiloids (Cephalopoda) from Gotland, Sweden: implications for interpretation of mode of life and phylogeny Introduction The Silurian Author: Harry Mutvei.

Introduction. As the second installment of our series of taxonomic works concerning the Ordovician cephalopods of the Sibumasu Block in Southeast Asia, the present study describes one new genus and two species of the subclass Nautiloidea from Myanmar, namely, Sibumasuoceras langkawiense (Kobayashi, ) and Tasmanoceras sp.

This is on the basis of the specimens kept in Cited by: 7. The taxonomic distribution of endocones and endocone-like structures, combined with the potential for endosiphuncular diaphragms to evolve into endocones, suggests that the presence of endocones cannot be used to diagnose the Endocerida.

Two distinct groups of Early Ordovician cephalopods that bear endocones may be by: 5. Foerste, A. F., Savage, T. (): Ordovician and Silurian cephalopods of the Hudson Bay area. – Denison University Bulletin, Journal of the Scientific Laboratories, 1– Frey, R.

(): A well-preserved specimen of Schuchertoceras (Cephalopoda, Ascocerida) from the Upper Ordovician (basal Richmondian) of Southwest Ohio. Gondwanan nautiloid cephalopods from the Ordovician of Myanmar necting rings and differentiated endosiphuncular deposits and lacks a detailed endosiphuncular canal system, lower Silurian.

Ordovician and Silurian rocks of Avalonia, Baltica, Laurentia and Perunica. The limited Estonian record of Silurian ascocerids is complemented with a specimen from the Pähkla locality (Island of Saaremaa; Paadla Regional Stage, Ludlow Series) representing the stratigraphically oldest known occurrence of ascocerids in the Silurian of Estonia.

Gondwanan Nautiloid Cephalopods from the Ordovician of Myanmar Article (PDF Available) in Paleontological Research 19(4) October with Reads How we measure 'reads'.

The late Katian, Late Ordovician Boda Limestone of Dalarna, Sweden contains a rich cephalopod assemblage. The assemblage consists of 61 species, of 31 genera, comprising almost all major Ordovician cephalopod orders.

Most common and diverse are the Orthocerida. The Ascocerida are also remarkably comman and diverse. Cephalopods and the Ordovician Radiation: Occupation of pelagic habitats Occurrence data, morphological characters, and taphonomic pattern lead to the conclusion, that Orthocerida and Lituitida are vertical migrants of the free water column, which inhabited, but not exclusively, the open oceans beginning from, at least, the latest by:.

The cephalopods of the subclass Orthoceratoidea, which are termed “orthoceratoids” herein, are a group that remains “the last unexplored wilderness in the Cephalopoda” (Flower ).After 45 years this statement still holds true because phylogeny reconstructions are hindered by their morphological simplicity, numerous homeomorphies and iterative by: Kröger, B.

Concentrations of juvenile and small adult cephalopods in the Hirnantian cherts (Late Ordovician) of Porkuni, Estonia. lar pattern for bryozoans at the Ordovician–Silurian boundary siphuncular segment showing the annular endosiphuncular deposits.

B. Orthoceratidae gen. et spec. indet. A, TUG /1. C.Introduction and material. Since Noetling documented Orthoceras sp. indet. from the east of Mandalay, many Ordovician cephalopods of Myanmar (Burma) have been described in a series of paleontological works by Reed (, ) and in a paper of Thein (), or have been recorded in geologic reports, such as La Touche (), Brown (), Brown and Sondhi (a, b), Pascoe (), as well as Cited by: