A Late Carboniferous Coleoid Cephalopod from the Mazon Creek Lagerstatte USA
Larisa A. Doguzhaeva,1 Royal H. Mapes,2 and Harry Mutvei3 'Paleontological Institute of the Russian Academy of Sciences, St. Profsoyuznaya, 123, Moscow 117997, Russia, ldoguzhaeva rambler.ru 2Department of Geological Sciences, Ohio University, Athens, OH 45701, USA, mapes ohio.edu 3Department of Palaeozoology, Swedish Museum of Natural History S-10405 Stockholm, Sweden, harry.mutvei nrm.se 2 Studied Material, State of Preservation, and 3 Comparative 3.2 Cephalic 3.2.2 Arm 3.3 Fossilized...
References Ygq
Allcock, A. L., A. S. Bierley, J. P. Thorpe, and P. G. Rodhouse. 1997. Restricted gene flow and evolutionary divergence between geographically separated populations of the Antarctic octopus Pareledone turqueti. Marine Biology 129 97-102. Allcock, A. L., and S. B. Piertney. 2002. Evolutionary relationships of Southern Ocean Octopodidae Cephalopoda Octopoda and a new diagnosis of Pareledone. Marine Biology 140 129-135. Anderson, F. E. 2000. Phylogeny and historical biogeography of the loliginid...
Systematic Paleontology
The following features of the morphology and preservation in the specimens under discussion were analyzed to elucidate their systematic assignment 1 division of the shell into a proostracum-like structure, body chamber, phragmocone, and rostrum 2 presence of fossilized soft-tissues covering the shell 3 presence of the arm hooks, 4 presence of ink, and 5 a unique radula structure. Fig. 6.11A, B Austrotrachyceras sp., NHMW2005z 0006 0001, Upper Triassic, Lower Carnian, Lower Austria, locality...
Function of the Aptychus Type Jaw
The aptychus type jaw has generally been interpreted as an adaptation for feeding on small prey microphagy Morton and Nixon, 1987 Lehmann and Kulicki, 1990 Seilacher, l993 Engeser and Keupp, 2002 . Several morphological features of the jaw have been cited in support of this interpretation 1 the presence of a blunt anterior margin with the two wing tips diverging at the apex, 2 the general absence of a thickened calcareous deposit at the apical end, 3 the presence of a groove, rather than a...
Relocation Experiment 1
Tag retention, determined as the time postrelease before the tag stopped moving for all subsequent relocations, was 17-51 days in 1996, but less than 24 h in 2003 due to different attachment methods. Thus, results in 2003 reflect very short-term movements, and do not necessarily indicate final choice of habitat. Immediately on release, octopuses either readily reoccupied their previous dens 1996, released where captured , sought nearby shelter under kelp if it was available 2003, shallow...
Baculites sp smooth Pierre Shale South Dakota
The body chambers containing lower jaws are fragmentary and range from 43.2 mm to 120.9 mm in length Figs. 13.4-14, Table 13.1 . All of the body chambers are steinkerns but several retain pieces of the aragonitic outer shell composite internal molds . The body chambers consist of four stout and eight slender individuals, presumably representing mature macroconchs and microconchs, respectively. In specimens that preserve the ultimate septum or in which the shell expands enough to detect the...
Migrational Routes and Paleolatitudinal Disposition of Kutch
The above mentioned Late Tithonian assemblage of Kutch thus suggests a complex pattern of migrational history of ammonite taxa from different provinces and at the same time dispersal of endemic forms species level to other areas. The presence of genera previously known in different provinces indicates a grand migrational event during the global sea level rise. This large scale transgression helped establish seaway connections among various isolated or semi-isolated basins. Many of the immigrant...
Upper Tithonian Assemblages of Different Faunal Provinces
The paleobiogeographic history of Mesozoic ammonites is marked by the repeated alternation of high degrees of provincialism and cosmopolitanism. The peak of ammonite provincialism occurred during the Late Jurassic and Early Cretaceous Gordon, 1976 . Different names were given for the Upper Jurassic stages in different regions because of this high endemism, i.e., Tithonian in the Tethyan and Indo- v-sripta I. beyschlagi Ammonite bands Fig. 17.2 Stratigraphic section showing the position of the...
Bdesheim
Of the cross sections of manticoceratids from B desheim Eifel that were published by Clausen 1969 , four characteristic individuals are highlighted in Fig. 3.11. The minute pyritized material comes from dark shales, and the question arose whether these specimens, which are less than 20 mm in diameter, portray similar ontogenetic trajectories to the normal-sized material from other localities. The manticoceratids from B desheim have conchs with ontogenetically accelerated coiling rate WER Fig....