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4 results for “Trilophosuchus”
Data from: Cranial anatomy of the mekosuchine crocodylian Trilophosuchus rackhami Willis, 1993
<p>One of the best-preserved crocodylian fossil specimens from the Cenozoic of Australia is the holotype of the mekosuchine <em>Trilophosuchus rackhami,</em> from the middle Miocene (13.56 ± 0.67 Ma) Ringtail Site at Riversleigh, northwestern Queensland. Although lacking most of the snout, the holotype skull of <em>T. rackhami</em> (QMF16856) has an exceptionally well-preserved cranium. Micro-CT scanning of the holotype has allowed for all the preserved cranial bones to be digitally disarticulated, facilitating an unprecedented insight into the cranial anatomy of not just <em>T. rackhami</em>, but any mekosuchine. <em>Trilophosuchus rackhami</em> was a small-bodied crocodylian and one of the most morphologically distinct mekosuchines, characterized by a unique combination of cranial characteristics several of which are exclusive to the species. Fossil material that is definitively referrable to the species <em>T. rackhami</em> is currently known solely from the middle Miocene Ringtail Site. However, an isolated parietal from Hiatus Site at Riversleigh demonstrates that <em>Trilophosuchus</em> also occurred during the late Oligocene (~25 Ma), extending the range of the genus by more than ten million years. The new description of <em>T. rackhami</em> also allowed for a reevaluation of its phylogenetic relationships. Our results reaffirm the placement of <em>T. rackhami</em> as a member of Mekosuchinae within the subclade Mekosuchini. In all analyses, Mekosuchinae was consistently found to be monophyletic and part of the larger crocodylian clade Longirostres. However, the assignment of Mekosuchinae as a subset of Crocodylidae is brought into question, suggesting that the status of Mekosuchinae as a subfamily should be reconsidered.</p>
Data from: Neuroanatomy of the mekosuchine crocodylian Trilophosuchus rackhami Willis, 1993
<p>Although our knowledge on crocodylomorph palaeoneurology has experienced considerable growth in recent years, the neuroanatomy of many crocodylomorph taxa has yet to be studied. This is true for Australian taxa, where thus far only two crocodylian crocodylomorphs have had aspects of their neuroanatomy explored. Here, the neuroanatomy of the Australian mekosuchine crocodylian <em>Trilophosuchus rackhami</em> is described for the first time, which significantly increases our understanding on the palaeoneurology of Australian crocodylians. The palaeoneurological description is based on the taxon's holotype specimen (QMF16856), which was subjected to a µCT scan. Because of the exceptional preservation of QMF16856, most neuroanatomical elements could be digitally reconstructed and described in detail. Therefore, the palaeoneurological assessment presented here is hitherto the most in-depth study of this kind for an extinct Australian crocodylomorph. <em>Trilophosuchus</em> <em>rackhami</em> has a brain endocast with a distinctive morphology that is characterized by an acute dural peak over the hindbrain region. While the overall morphology of the brain endocast is unique to <em>T</em>. <em>rackhami</em>, it does share certain similarities with the notosuchian crocodyliforms <em>Araripesuchus</em> <em>wegeneri</em> and <em>Sebecus</em> <em>icaeorhinus</em>. The endosseous labyrinth displays a morphology that is typical for crocodylians, although a stand-out feature is the unusually tall common crus. Indeed, the common crus of <em>T</em>. <em>rackhami</em> has one of the greatest height ratios among crocodylomorphs with currently known endosseous labyrinths. The paratympanic pneumatic system of <em>T</em>. <em>rackhami</em> is greatly developed and most similar to those of the extant crocodylians <em>Osteolaemus</em> <em>tetraspis</em> and <em>Paleosuchus</em> <em>palpebrosus</em>. The observations on the neuroanatomy of <em>T</em>. <em>rackhami</em> are also discussed in the context of Crocodylomorpha. The comparative palaeoneurology reinforces previous evaluations that the neuroanatomy of crocodylomorphs is complex and diverse among species, and <em>T</em>. <em>rackhami</em> has a peculiar neuromorphology, particularly among eusuchian crocodyliforms.</p>
Data from: Neuroanatomy of the mekosuchine crocodylian Trilophosuchus rackhami Willis, 1993
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Data from: Cranial anatomy of the mekosuchine crocodylian Trilophosuchus rackhami Willis, 1993
Open the record for dataset details and reuse information.
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