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5 results for “Palaeoxonodon”
Fig. 3 in New partial dentaries of amphitheriid mammal Palaeoxonodon ooliticus from Scotland, and posterior dentary morphology in early cladotherians
Fig. 3. Parsimony analysis and reconstructions of dentary of Palaeoxonodon ooliticus (B, C), with Amphitherium (D) for comparison. A. Equally weighted parsimony analysis with additional mandibular characters for the early cladotherian Palaeoxonodon ooliticus, and rescored and updated matrix from Close et al. 2016 (adapted from Zhou et al. 2013). Jackknife resampling statistics and Bremer values (bold) are shown adjacent to individual nodes. B. Composite of NMS G. 2015.17.1 (grey) and coronoid of NMS G.2017.37.1 (red) in buccal (B1) and lingual (B2) views (arrows indicate anterior direction). Data for NMS G. 2015.17.1 from Close et al. (2016). C. Reconstruction of jaw in buccal (C1) and lingual (C2) views. D. Reconstruction based on composite created by EP from NHMUK PV M.36822 and OUMNH J.20075 in buccal view. Scale bars 1 mm.
Fig. 1. Amphitheriid mammalian Palaeoxonodon ooliticus Freeman, 1976b in New partial dentaries of amphitheriid mammal Palaeoxonodon ooliticus from Scotland, and posterior dentary morphology in early cladotherians
Fig. 1. Amphitheriid mammalian Palaeoxonodon ooliticus Freeman, 1976b (NMS G.1992.47.123) from the Kilmaluag Formation, Bathonian, in lingual A), buccal (B), and occlusal (C) views; partial left dentary (A1–C1); dentition only (A2–C2). Arrows indicate anterior direction.
Fig. 2. Amphitheriid mammalian Palaeoxonodon ooliticus Freeman, 1976b in New partial dentaries of amphitheriid mammal Palaeoxonodon ooliticus from Scotland, and posterior dentary morphology in early cladotherians
Fig. 2. Amphitheriid mammalian Palaeoxonodon ooliticus Freeman, 1976b (NMS G.2017.37.1) from the Kilmaluag Formation, Bathonian, in lingual (A), buccal (B), and occlusal (C) views; partial left dentary (A1–C1), dentition only (A2–C2). Arrows indicate anterior direction.
Data from: A lower jaw of Palaeoxonodon from the Middle Jurassic of the Isle of Skye, Scotland, sheds new light on the diversity of British stem therians
The Middle Jurassic was a key interval of mammalian evolutionary history that witnessed the diversification of the therian stem-group. Great Britain has yielded a significant record of mammalian fossils from this interval, represented by numerous isolated jaws and teeth from the Bathonian of Oxfordshire and the Isle of Skye. This record captures a key period in early cladotherian evolution, with amphitheriids, peramurans and "stem zatherians" displaying intermediate talonid morphologies that document the evolutionary assembly of tribosphenic molars. We present a mandible with near-complete dentition from the late Bathonian (ca. 167.4–166.5 Ma) Kilmaluag Formation, near Elgol, Skye, representing the amphitheriid Palaeoxonodon ooliticus, previously known only from isolated teeth. The specimen sheds new light on the taxonomic diversity of British Middle Jurassic stem therians, as the morphological variation within the preserved tooth row encompasses that previously ascribed to three distinct species within two genera: Palaeoxonodon ooliticus, P. freemani, and Kennetheridium leesi. Thus, both P. freemani and Kennetheridium leesi are subjective junior synonyms of P. ooliticus. The dental formula of P. ooliticus (i4:c1:p5:m5) is intermediate between the primitively larger postcanine count (p5:m6-7) of Amphitherium and the reduced number in peramurans and tribosphenidans (p5:m3). Phylogenetic analyses of P. ooliticus generally confirm a close affinity with Amphitherium, but highlight the lack of strong empirical support for hypothesized patterns of divergences among early cladotherians.
Data from: A lower jaw of Palaeoxonodon from the Middle Jurassic of the Isle of Skye, Scotland, sheds new light on the diversity of British stem therians
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