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Shell Structures in Carboniferous Bactritid-Like Coleoids (Cephalopoda) from South Central USA

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Shell Structures in Carboniferous Bactritid-Like Coleoids (Cephalopoda) from South Central USA See discussions, stats, and author profiles for this publication at: https://www.researchgate.net/publication/271754564 Shell structures in Carboniferous bactritid-like coleoids (Cephalopoda) from South Central USA Article in Gff -Uppsala- · September 2012 DOI: 10.1080/11035897.2012.696134 CITATIONS READS 4 69 3 authors: Harry Mutvei Royal Mapes Swedish Museum of Natural History American Museum of Natural History 146 PUBLICATIONS 1,943 CITATIONS 164 PUBLICATIONS 1,603 CITATIONS SEE PROFILE SEE PROFILE Larisa Doguzhaeva Swedish Museum of Natural History 133 PUBLICATIONS 684 CITATIONS SEE PROFILE Some of the authors of this publication are also working on these related projects: Evolution and Paleoecology of Carboniferous coleoids View project Bioerosion in Nautilus (FFL-grant by the FAU) (Aug '13-Jul '14) View project All content following this page was uploaded by Harry Mutvei on 09 February 2015. The user has requested enhancement of the downloaded file. All in-text references underlined in blue are added to the original document and are linked to publications on ResearchGate, letting you access and read them immediately. This article was downloaded by: [Naturhistoriska Riksmuseum] On: 27 March 2014, At: 03:49 Publisher: Taylor & Francis Informa Ltd Registered in England and Wales Registered Number: 1072954 Registered office: Mortimer House, 37-41 Mortimer Street, London W1T 3JH, UK GFF Publication details, including instructions for authors and subscription information: http://www.tandfonline.com/loi/sgff20 Shell structures in Carboniferous bactritid-like coleoids (Cephalopoda) from South Central USA Harry Mutvei a , Royal H. Mapes b & Larisa A. Doguzhaeva a a Department of Palaeozoology , Swedish Museum of Natural History , Box 50007, SE-10405 , Stockholm , Sweden b Department of Geological Sciences , Ohio University , Athens , OH , 4570 , USA Published online: 13 Sep 2012. To cite this article: Harry Mutvei , Royal H. Mapes & Larisa A. Doguzhaeva (2012) Shell structures in Carboniferous bactritid- like coleoids (Cephalopoda) from South Central USA, GFF, 134:3, 201-216, DOI: 10.1080/11035897.2012.696134 To link to this article: http://dx.doi.org/10.1080/11035897.2012.696134 PLEASE SCROLL DOWN FOR ARTICLE Taylor & Francis makes every effort to ensure the accuracy of all the information (the “Content”) contained in the publications on our platform. However, Taylor & Francis, our agents, and our licensors make no representations or warranties whatsoever as to the accuracy, completeness, or suitability for any purpose of the Content. Any opinions and views expressed in this publication are the opinions and views of the authors, and are not the views of or endorsed by Taylor & Francis. The accuracy of the Content should not be relied upon and should be independently verified with primary sources of information. Taylor and Francis shall not be liable for any losses, actions, claims, proceedings, demands, costs, expenses, damages, and other liabilities whatsoever or howsoever caused arising directly or indirectly in connection with, in relation to or arising out of the use of the Content. This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. Terms & Conditions of access and use can be found at http:// www.tandfonline.com/page/terms-and-conditions GFF volume 134 (2012), pp. 201–216. A Scandinavian Journal of Earth Sciences Article Shell structures in Carboniferous bactritid-like coleoids (Cephalopoda) from South Central USA HARRY MUTVEI1, ROYAL H. MAPES2 and LARISA A. DOGUZHAEVA1 Mutvei, H., Mapes, R.H. & Doguzhaeva, L.A., 2012: Shell structures in Carboniferous bactritid-like coleoids (Cephalopoda) from South Central USA. GFF, Vol. 134 (Pt. xSeptember), pp. 201–216. q Geologiska Fo¨reningen. doi: 10.1080/11035897.2012.696134. Abstract: Morphological features of the shell including internal structures of the phragmocones of three different bactritoid cephalopod taxa assigned to the Order Bactritida: Bactrites quadrilineatus, Ctenobactrites lesliensis (L. Carboniferous) and the Order Parabactritida: Rugobactrites jacksboroensis (U. Carboniferous) were studied. The material comes from South Central USA. The features examined include the conch shape, siphuncle shape and ultrastructure of the shell wall, septa, septal neck and the connecting ring. These traits were then compared with Shimanskya postremus from Upper Carboniferous of Texas, which has been originally referred to bactritids and later placed within the coleoids in the Order Spirulida. Based on similarities and differences observed, B. quadrilineatus and C. lesliensis are now also considered being coleoids similar to S. postremus; R. jacksboroensis remains placed in the Order Parabactritida. Keywords: bactritid-like coleoids; Carboniferous; shell structure; South Central USA. 1Department of Palaeozoology, Swedish Museum of Natural History, Box 50007, SE-10405 Stockholm, Sweden; [email protected] 2Department of Geological Sciences, Ohio University, Athens, OH 4570, USA; [email protected] Manuscript received 29 February 2012. Revised manuscript accepted 18 May 2012. Introduction Some structures of cephalopod shells represent highly prismatic layers in the shell wall of the Recent Spirula (inner and conservative evolutionary traits. Such structures include the outer plates by Appello¨f 1893) and the shell wall structure seen ultrastructural organization of the shell of the phragmocone and in the Cretaceous spirulids Adygeya Doguzhaeva, 1996 and body chamber and the septa, septal necks and the connecting Naefia Wetzel, 1930. Thus, according to that interpretation, B. rings of the siphuncle in the phragmocone. Because of the postremus must be a coleoid with an internal shell and not a conservative nature of these features, they should be placed at a bactritoid. On the basis of its unique shell structure, B. high level of importance in the classification of the Cephalopoda postremus was assigned to the new genus Shimanskya of the new and that the taxa that exhibit similarities in these traits should be family Shimanskyidea and placed in the Order Spirulida. With Downloaded by [Naturhistoriska Riksmuseum] at 03:49 27 March 2014 considered as being more closely related to those individuals this discovery, the examination of other taxa described as that do not have similar traits. bactritoids seemed warranted to see whether other bactritoid Doguzhaeva et al. (1996, 1999, 2010a) found that the shell taxa from the Carboniferous have the Shimanskya type of the wall structure in one Upper Carboniferous bactritoid from Texas shell structure or whether they have the typical structure seen in that was originally identified as Bactrites postremus Miller, bactritoids, nautiloids and ammonoids. 1930, and subsequently by Mapes (1979), differed considerably In order to test other bactritoids for this condition, the from that in the Upper Carboniferous Bactrites sp. from the Ural Carboniferous bactritoid collection of the second author from Mountains, Russia (Doguzhaeva 2002). The shell wall in the Carboniferous of the Midcontinent of North America was Bactrites sp. from the Ural Mountains consists of a thin outer examined, and the most promising specimens were selected for prismatic layer and a thick inner nacreous layer, similar to the study. Over 10 000 specimens are in this collection, but almost shell wall structure observed in nautiloids and ammonoids. In 95% are microscopic bactritellas, and of the larger specimens, contrast, B. postremus from the Upper Carboniferous of Texas most were internal molds without external shell. Of those has two porous and loosely mineralized, prismatic layers of specimens that retain shell, most are strongly recrystallized about equal thickness without a nacreous layer. These two layers shells. Three taxa were eventually isolated as having adequate, are separated by a surface covered with parallel ridges that although still poorly preserved, shell suitable for this kind of somewhat resemble a finger print pattern. The two loosely analysis. These taxa are identified by using the terminology of mineralized, prismatic layers in B. postremus were interpreted Mapes (1979) as: Bactrites quadrilineatus Girty, 1909 and by Doguzhaeva et al. (1999, 2010a) as corresponding to the two Ctenobactrites lesliensis Mapes, 1979 from the upper part of 202 Mutvei et al.: Shell structures in Carboniferous bactritid-like coleoids GFF 134 (2012) the Lower Carboniferous (Serpukhovian), and Rugobactrites Observations on shell structures jacksboroensis Mapes, 1979 from the upper part of the Upper Carboniferous (Gzhelian). In addition to examining the shell S. postremus (Miller, 1930) structure, details of the septal structure and siphuncle structure Figs. 1–6 including the septal necks and connecting rings were examined. B. postremus Miller, 1930, pl. 38, fig. 11. B. postremus Mapes, 1979 pl. 21, figs. 13–15; pl. 33, figs. 10–13; pl. 35, figs. 1–3. Materials and methods S. postremus, Doguzhaeva, Mapes and Mutvei, 1999, fig. 1A, B. The material comprises mainly partial phragmocones and body S. postremus chambers of B. quadrilineatus and C. lesliensis from the Lower , Doguzhaeva, Mapes and Mutvei, 2010a, figs. 2A, Carboniferous, and B. postremus and R. jacksboroensis from the 3A. Upper Carboniferous. For comparative purpose Shimanskya postremus was restudied. Shell The following localities yielded
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