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9 results for “Posidonia Shale”
Fig. 3 in The oldest "intermetamorphic" larva of an achelatan lobster from the Lower Jurassic Posidonia Shale, South Germany
Fig. 3. Size comparison of different non-phyllosoma type achelatan larvae. All specimens as idealised restorations. The light grey areas represent body parts not being preserved, but inferred. A. Polzicaris sahelalmae (based on Haug et al. 2013a). B. SMNS 70449. C. "Palinurina" tenera, earliest (C1) and largest (C2) known stage (based on Haug and Haug 2016). D. Cancrinos claviger, earlier larva still possessing exopods (D1), later larva with exopods already absent (D2), possible juvenile, yet without triangular sternum (D3) (D1, D2, based on Haug et al. 2013a; D3, based on Haug and Haug 2015).
Fig. 1 in The oldest "intermetamorphic" larva of an achelatan lobster from the Lower Jurassic Posidonia Shale, South Germany
Fig. 1. Larva of Achelata gen. et sp. indet. (SMNS 70449), Toarcian, Lower Jurassic, Gomaringen, Southern Germany. A. Composite microscopic photograph under cross-polarised light. B. Colour-marked photograph indicating the visible structures. Abbreviations: ba, basipod; cx, coxa; e1–5, endopod element 1–5; m3, maxilliped 3; p2–6, pleon segment 2–6; t4–8, thoracic appendages 4–8 ("pereiopods" 1–5).
Fig. 2 in The oldest "intermetamorphic" larva of an achelatan lobster from the Lower Jurassic Posidonia Shale, South Germany
Fig. 2. Larva of Achelata gen. et sp. indet. (SMNS 70449), Toarcian, Lower Jurassic, Gomaringen, Southern Germany. A. Stereo-image showing original relief of the fossil; based on virtual surface. B. Depth-inverted stereo-image showing morphologically correct relief in ventral view. Please use red-cyan glasses to view A and B. C. Non-stereo image; colour-marked are the elevations of the thoracic sternum.
Data from: Skeletal microstructure of Stenopterygius quadriscissus (Reptilia, Ichthyosauria) from the Posidonienschiefer (Posidonia Shale, Lower Jurassic) of Germany
Ichthyosaurians (Ichthyosauria) are a major clade of secondarily aquatic marine tetrapods that occupied several major predatory niches during the Mesozoic Era. Multiple lines of evidence including isotopic, body shape and swimming modality analyses suggest they exhibited elevated growth and metabolic rates, and body temperatures. However, applications of osteohistological methods to test hypotheses regarding their physiology are few. Previous studies focused on the humeri, vertebrae and ribs from a small number of taxa. Here, we use osteohistological methods to describe the bone microstructure of over 30 cranial and post-cranial elements from a nearly complete, articulated individual of <i>Stenopterygius quadriscissus</i> from the Posidonienschiefer Formation (Posidonia Shale, Lower Jurassic) of Germany. The specimen shows highly vascularized primary bone and spongious secondary bone in its limbs, suggesting an overall shift to a lighter spongious structured skeleton was achieved through multiple developmental mechanisms. The modified perichondral ossification in elements of the limbs distal to the stylopodium informs our understanding of functional morphology, including hydrodynamic forces on the paddles. The ribs show variation in cortical thickness and trabecular organization along their length. Cyclical growth is inferred from changes in vascularization and osteocyte density as well as the presence of annuli in primary fibrolamellar bone. Cranial elements, due to their relative density and better preservation of growth marks, may prove to be of particular importance in future skeletochronological studies of post-Triassic ichthyosaurians. We infer and corroborate hypotheses of elevated growth rates and metabolic rates in ichthyosaurians, and the potential for thermoregulation similar to extant homeothermic ectotherms.
Preservational modes of some ichthyosaur soft tissues (Reptilia, Ichthyopterygia) from the Jurassic Posidonia Shale of Germany
<p><em><span>Konservat-Lagerstätten</span></em><span>, such as the Toarcian (Early Jurassic) Posidonia Shale of southwestern Germany, are renowned for their spectacular fossils. Ichthyosaur skeletons recovered from this formation are frequently associated with soft-tissues; however, the preserved material ranges from three-dimensional, predominantly phosphatized structures to dark films of mainly organic matter. We examined soft-tissue residues obtained from two ichthyosaur specimens using an integrated ultrastructural and geochemical approach. Our analyses revealed that the superficially-looking 'films' in fact comprise sections of densely aggregated melanosome (pigment) organelles sandwiched between phosphatized layers containing fibrous microstructures. We interpret this distinct layering as representing condensed and incompletely degraded integument from both sides of the animal. When compared against previously documented ichthyosaur fossils, it becomes readily apparent that a range</span> <span>of preservational modes exists between presumed 'phosphatic' and 'carbonized' soft-tissue remains. Some specimens show high structural fidelity (e.g., distinct integumentary layering), while others, including the fossils examined in this study, retain few original anatomical details. This diversity of soft-tissue preservational modes among Posidonia Shale ichthyosaurs offers a unique opportunity to examine different biostratinomic, taphonomic, and diagenetic variables that potentially could affect the process of fossilization. Soft-tissue preservation in the Posidonia Shale likely was regulated by a multitude of factors, including decay efficacy and speed of phosphatic mineral nucleation; these in turn were governed by a seafloor with sustained microbial mat activity fuelled by high organic matter input and seasonally fluctuating oxygen levels. </span></p>
Data from: Evaluating growth in Macrospondylus bollensis (Crocodylomorpha: Teleosauroidea) in the Toarcian Posidonia Shale, Germany
<p>The dataset includes raw data (S1 - S3), .txt files (S3) and R codes (S3). Raw data is comprised of bone element measurements. S3 is a compressed .zip folder which includes all data (code, raw and additional) that pertains to our (1) ANCOVA and (2) evolutionary allometry analyses. We have decided to keep all these files together in one folder for better access and to not mix them with our ontogenetic data. </p>
Data from: Skeletal microstructure of Stenopterygius quadriscissus (Reptilia, Ichthyosauria) from the Posidonienschiefer (Posidonia Shale, Lower Jurassic) of Germany
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Data from: Evaluating growth in Macrospondylus bollensis (Crocodylomorpha: Teleosauroidea) in the Toarcian Posidonia Shale, Germany
Open the record for dataset details and reuse information.
Preservational modes of some ichthyosaur soft tissues (Reptilia, Ichthyopterygia) from the Jurassic Posidonia Shale of Germany
Open the record for dataset details and reuse information.
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