Possible origin of the xenacanth sharks Orthacanthus texensis and Orthacanthus platypternus in the Lower Permian of Texas, USA

References

• Donelan , C and Johnson , GD . 1997 . Orthacanthus platypternus (Chondrichthyes: Xenacanthida) occipital spines from the Lower Permian Craddock Bonebed, Baylor County, Texas . J Vertebr Paleontol , 17 ( 3, Abstracts ) : 43A
   Google Scholar
• Ginter , M , Hampe , O and Duffin , C . 2010 . “ Chondrichthyes, Paleozoic Elasmobranchii: teeth ” . In Handbook of paleoichthyology , Edited by: Schultze , H-P . Vol. 3D , 1 – 168 . München : Verlag Dr. Friedrich Pfeil .
   Google Scholar
• Hampe , O . 1988 . Über die Bezahnung des Orthacanthus (Chondrichthyes: Xenacanthida; Oberkarbon-Unterperm) . Paläont Zeit , 62 : 285 – 296 .
   Google Scholar
• Hampe , O . 1993 . “ Variation of xenacanthid teeth in the Permo-Carboniferous deposits in the Saar-Nahe Basin (SW-Germany) ” . In New Research on Permo-Carboniferous Faunas. Pollichia-Buch. Bad Dürkheim Edited by: Heidtke , U' compiler . Vol. 29 , 37 – 51 .
   Google Scholar
• Hampe , O . 2003 . Revision of the Xenacanthida (Chondrichthyes: Elasmobranchii) from the Carboniferous of the British Isles . Trans R Soc Edinburgh: Earth Sci , 93 : 191 – 237 .
   Google Scholar
• Hentz , TF . 1988 . Lithostratigraphy and paleoenvironments of Upper Paleozoic continental red beds, North-Central Texas: Bowie (new) and Wichita (revised) Groups . Bur Econ Geol Rep Invest Univ Tex , 170 : 1 – 55 .
   Google Scholar
• Hentz , TF and Brown , LF Jr . 1987 . “ Wichita Falls-Lawton sheet ” . In Geologic atlas of Texas. Bureau of Economic Geology – the University of Texas, Austin: scale 1:250,000 Edited by: Barnes , VE project director .
   Google Scholar
• Hotton , N . 1952 . Jaws and teeth of American xenacanth sharks . J Paleontol , 26 : 489 – 500 .
   Google Scholar
• Johnson , GD . 1987 . “ Deformed xenacanthodiid shark teeth from the Permian of Texas ” . In Papers in vertebrate paleontology in honor of Morton Green. Dakoterra Edited by: Martin , JE and Ostrander , GE . Vol. 3 , 22 – 27 . Rapid City
   Google Scholar
• Johnson , GD . 1992 . Early Permian vertebrate microfossils from Archer City Bonebed 3, Archer County, Texas . J Verteb Paleontol , 12 ( 3, Abstracts ) : 35A – 36A .
   Google Scholar
• Johnson , GD . 1999 . Dentitions of Late Palaeozoic Orthacanthus species and new species of ?Xenacanthus (Chondrichthyes: Xenacanthiformes) from North America . Acta Geol Pol , 49 : 215 – 266 .
   Google Scholar
• Johnson , GD . 2003 . Dentitions of Barbclabornia (new genus, Chondrichthyes: Xenacanthiformes) from the upper Palaeozoic of North America . Mitt Mus Naturk Berl Geowiss Reihe , 6 : 125 – 146 .
   Google Scholar
• Johnson , GD . 2005 . Underdeveloped and unusual xenacanth shark teeth from the Lower Permian of Texas . Proc S Dak Acad Sci , 84 : 215 – 223 .
   Google Scholar
• Johnson , GD . 2007 . “ Lower Permian chondrichthyans from Archer and Baylor counties, Texas: an update ” . In The Lower Permian of North Texas. Society of Vertebrate Paleontology 67th Annual Meeting, field trip guidebook Edited by: Sander , PM . 16 – 19 . Austin
   Google Scholar
• Johnson , GD . 2011 . “ Origin of Orthacanthus texensis and O. platypternus from O. ?compressus (Chondrichthyes, Xenacanthiformes) in the Lower Permian of Texas, USA ” . In Twelfth International Symposium on Early Vertebrates/Lower Vertebrates. Ichthy Iss Spec Pub Edited by: Johnson , GD . Vol. 12 , 29 Dallas
   Google Scholar
• Johnson , GD and Thayer , DW . 2009 . Early Pennsylvanian xenacanth chondrichthyans from the Swisshelm Mountains, Arizona, USA . Acta Palaeont Pol , 54 : 649 – 668 .
   Web of Science ®Google Scholar
• Johnson , GD , Murry , PA and Storer , JE . 1994 . Recovery of vertebrate microfossils . Proc S Dak Acad Sci , 73 : 211 – 230 .
   Google Scholar
• Reisz , RR , Laurin , M and Marjanović , D . 2010 . Apsisaurus witteri from the Lower Permian of Texas: yet another small varanopid synapsid, not a diapsid . J Vertebr Paleontol , 30 : 1628 – 1631 .
   Web of Science ®Google Scholar
• Sander , PM . 1989a . Early Permian depositional environments and pond bonebeds in central Archer County, Texas . Palaeogeog Palaeoclimatol Palaeoecol , 69 : 1 – 21 .
   Web of Science ®Google Scholar
• Sander , PM . 1989b . “ Stop 1—Archer City Bonebed 3 ” . In Permo-Carboniferous vertebrate paleontology, lithostratigraphy, and depositional environments of North-Central Texas. Guidebook, Field Trip No. 2, 49th Annual Meeting of the Society of Vertebrate Paleontology Edited by: Hook , RW . 55 – 56 . Austin
   Google Scholar
• Sander , PM and Krahl , A . 2007 . “ Stop5—Conner Ranch/Cottonwood Creek of Romer. 5 ” . In The Lower Permian of North Texas. Society of Vertebrate Paleontology 67th Annual Meeting, field trip guidebook Edited by: Sander , PM . 1 – 53 . Austin
   Google Scholar
• Schultze , H-P and Soler-Gijón , R . 2004 . A xenacanth clasper from the ?uppermost Carboniferous–Lower Permian of Buxières-les Mines (Massif Central, France) and the palaeoecology of the European Permo-Carboniferous basins . N Jb Paläont Abh , 232 ( 2/3 ) : 325 – 363 .
   Web of Science ®Google Scholar
• Soler-Gijón , R . 1995 . Evidence of predator-prey relationship in xenacanth sharks of the Upper Carboniferous (Stephanian C) from Puertollano, Spain . Geob Mém Spéc , 19 : 151 – 156 .
   Google Scholar
• Soler-Gijón , R . 1997 . Orthacanthus meridionalis, a new xenacanth shark (Elasmobranchii) from the Upper Carboniferous of the Puertollano basin, Spain . N Jb Geol Paläont Abh , 204 : 141 – 169 .
   Google Scholar
• Whitenack , LB and Gottfried , MD . 2010 . A morphometric approach for addressing tooth-based species delineation in fossil mako sharks, Isurus (Elasmobranchii: Lamniformes) . J Vertebr Paleontol , 30 : 17 – 25 .
   Web of Science ®Google Scholar
• Zidek , J . 1993 . “ Juvenile Orthacanthus platypternus (Cope 1883) (Elasmobranchii: Xenacanthiformes) from the Upper Carboniferous near Hamilton, Kansas, U.S.A ” . In New research on Permo-Carboniferous faunas. Pollichia-Buch Edited by: Heidtke , U'compiler . Vol. 29 , 53 – 65 . Bad Dürkheim
   Google Scholar