By S. V. Boletzky (auth.), Federico Olóriz, Francisco J. Rodríguez-Tovar (eds.)
Relying at the most up-to-date analytical suggestions, this all-embracing new reference bargains accomplished assurance of the improvement, evolution, and morphology of either fossil and dwelling cephalopods. In 34 in-depth chapters a gaggle of fifty one overseas neontologists and peleontologists supply and opverview of present equipment, information, analyses, and interpretations, and posit feedback for destiny study.
With its extraordinary blend of fine contributions on dwelling and fossil cephalopods, this ebook offers researchers and complex scholars in paleontology, invertebrate zoology, evolutionary biology, and allied disciplines with a trove of modern info and authoritative interpretations that may immeasurably profit their very own studies.
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Additional info for Advancing Research on Living and Fossil Cephalopods: Development and Evolution Form, Construction, and function Taphonomy, Palaeoecology, Palaeobiogeography, Biostratigraphy, and Basin Analysis
This study has attempted to compile data from 44 S. M. Klofak et al. members of the most primitive ammonoid clade. These data, based both on internal and external features show that these ammonoids share homologies with the rest of the Ammonoidea, in possessing similar embryonic shell characters. The actual character states are different, allowing for further phylogenetic analysis. The presence of similar features supports the notion that all ammonoid shells probably shared a common mode of formation; as one would expect in a monophyletic clade.
The spacing of the lirae offers another important clue to the mode of embryonic formation. While there is some variation in the spacing of Iirae from the embryonic to the postembryonic part of the shell, the average spacing of lirae on both the embryonic and postembryonic shell is generally larger than that attributed to fine growth lines (-I tim) and is more consistant with spacing of ornamental features. Furthermore, we have found the presence of traces of what appear to be growth lines between the Iirae on the postembryonic shell (Fig.
6). " The specimen on which this illustration is based (Figure 12; see also Fig. 3B, C) clearly shows the accuracy of Clarke's illustration. It, however, does little to explain the nature of the structure. Embryonic Development of Primitive Ammonoids 33 Figure 8. Archanarcesles obesus (AMNH 45370, Devonian, Morocco). This juvenile specimen exhibits the best preservation of any specimen in our study. (A) Overview of the entire specimen showing the ammonitella (A), ending at the primary constriction (arrow).
Advancing Research on Living and Fossil Cephalopods: Development and Evolution Form, Construction, and function Taphonomy, Palaeoecology, Palaeobiogeography, Biostratigraphy, and Basin Analysis by S. V. Boletzky (auth.), Federico Olóriz, Francisco J. Rodríguez-Tovar (eds.)