By S. V. Boletzky (auth.), Federico Olóriz, Francisco J. Rodríguez-Tovar (eds.)

Relying at the most recent analytical innovations, this all-embracing new reference deals entire insurance of the advance, evolution, and morphology of either fossil and residing cephalopods. In 34 in-depth chapters a gaggle of fifty one foreign neontologists and peleontologists supply and opverview of present equipment, facts, analyses, and interpretations, and posit feedback for destiny study.
With its extraordinary blend of exceptional contributions on dwelling and fossil cephalopods, this e-book offers researchers and complex scholars in paleontology, invertebrate zoology, evolutionary biology, and allied disciplines with a trove of modern information and authoritative interpretations that might immeasurably gain their very own studies.

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Extra info for Advancing Research on Living and Fossil Cephalopods: Development and Evolution Form, Construction, and function Taphonomy, Palaeoecology, Palaeobiogeography, Biostratigraphy, and Basin Analysis

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Devonian lamellorthocerids might have been coleoid cephalopods as well (Bandel and Stanley, 1989). , 1983; Flower, 1988). Thus, one might expect that the non-rostrum coleoid cephalopods already existed in Carboniferous times, although thus far none have been reported. The present paper represents ·results of ultrastructural studies of the Late Carboniferous orthoconic cephalopod which was described as Bactrites postremus (Miller, 1930; Mapes, 1979). The shell wall ultrastructure strongly indicates that this mollusc secreted an internal shell, consisting of inner and outer prismatic plates, without a nacreous layer.

Particularly valuable are rare Palaeozoic fossils with unrecrystallized aragonite shell. This is why the majority of ultrastructural information recently available deals with Mesozoic cephalopds. The record available for Palaeozoic coleoids is currently restricted to the Carboniferous aulacocerids, which possess a rostrum, indicating that their shell was secreted within a soft body. Devonian lamellorthocerids might have been coleoid cephalopods as well (Bandel and Stanley, 1989). , 1983; Flower, 1988).

Relationships of CL, TW, and CS to Body Size and Weight Since CL, TW and CS values are overly scattered with respect to either DML or body weight in both species (Fig. I), it was not possible to detect any kind of relationship linking the variables. Better results were obtained by indexing CL, TW and CS with respect to the body weight. The best fit was obtained for straight line equations (Fig. 05 In addition, the equations indicate a negative allometric relationship between the indices of tentacle variables and body weight.

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