Thies, D. (1989): Some problematical sharks teeth (Chondrichthyes, Neoselachii) from the Early and Middle Jurassic of Germany. - Paläont. Z., 63: 103-117, 12 figs., 1 tabl.; Stuttgart. (original) (raw)
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This study investigates the Jurassic neoselachians, focusing on various genera represented by fragmentary skeletons and teeth, primarily from locations in southern Germany and France. Highlighting the challenges posed by sampling biases and the preservation of neoselachians, the work underscores the importance of teeth for systematic classification and the necessity of bulk sampling in paleontological research. The paper contributes to the understanding of the diversity and evolution of neoselachians during the Early and Middle Jurassic periods despite gaps in documentation due to historical geological changes and limited access to fossil sites.
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A virtually complete articulated specimen of Sphenodus macer (QUENSTEDT) is described from the Nusplingen Plattenkalk (Ulmense Subzone, Beckeri Zone, Late Kimmeridgian, Late Jurassic) of Egesheim near Nusplingen in south-western Germany. The first reconstruction of the body outline and description of the complete dentition and the neurocranium of a species of Sphenodus can be made from the specimen. The presence of an "eye" tooth in the upper dentition of S. macer is a convergence with lamniform sharks. Teeth of Sphenodus nitidus WAGNER are also present in the Nusplingen Plattenkalk and comparisons between these two species and the type species Sphenodus longidens AGASSIZ, the most frequent Jurassic species, confirms the validity of the three species.
Acta Palaeontologica Polonica, 2003
from the Middle Jurassic of SW Germany and NW Poland. Acta Palaeontologica Polonica 48 (4): 583-594. New neoselachian remains from the Middle Jurassic of SW Germany and NW Poland are described. The locality of Weilen unter den Rinnen in SW Germany yielded only few orectolobiform teeth from the Aalenian representing at least one new genus and species, Folipistrix digitulus, which is assigned to the orectolobiforms and two additional orectolobi− form teeth of uncertain affinities. The tooth morphology of Folipistrix gen. nov. indicates a cutting dentition and suggests specialised feeding habits. Neoselachians from Bathonian and Callovian drill core samples from NW Poland produced numerous selachian remains. Most teeth are damaged and only the crown is preserved. Few identifiable teeth come from uppermost lower to lower middle Callovian samples. They include a new species, Synechodus prorogatus, and rare teeth attributed to Palaeobrachaelurus sp., Pseudospinax? sp., Protospinax cf. annectans Woodward, 1919, two additional but unidentifiable Protospinax spp. and Squalogaleus sp. Scyliorhinids are represented only by few isolated tooth crowns. No batoid remains have been recovered. The two assemblages contribute to the knowledge about early neoselachian distribution and diversity.
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