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9 results for “Osteocallis”
Fig. 5. A in New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus
Fig. 5. A suite of traces in the rhynchosaurid archosauromorph Hyperodapedon mariensis (Tupi Caldas, 1933), UFRGS-PV-1581-T #14, bone fragment from Buriol Site, Brazil, Hyperodapedon AZ, Carnian. A. Two feeding traces of Osteocallis mandibulus Roberts et al., 2007, overlapped by a cluster of larger grooves. B. Natural cast formed by a cover of iron oxide showing the grooves in positive relief. Image mirrored to facilitate comparison. C, D. Clusters of grooves on different surfaces of the same bone fragment. E. Small Osteocallis mandibulus close to the trails shown in A and B.
Fig. 6 in New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus
Fig. 6. Clusters of grooves on bone fragments of the rhynchosaurid archosauromorph Hyperodapedon mariensis (Tupi Caldas, 1933) from Buriol Site, Brazil, Hyperodapedon AZ, Carnian. A. UFRGS-PV-1581-T #20, arcuate and paired grooves, similar to feeding traces of Osteocallis mandibulus Roberts et al., 2007, but without forming a trail. B. UFRGS-PV-1581-T #22, densely concentrated grooves, giving the bone surface an etched appearence. C. UFRGS-PV-1581-T #5, straight and arcuate grooves closely associated to an incipient Osteocallis mandibulus (arrow). D. UFRGS-PV-1581-T #26, straight and arcuate grooves and some isolated grooves. E. UFRGS-PV-1581-T #6, dentary fragment; E1, two clusters of grooves; E2, schematic drawing. F. UFRGS-PV-1581-T #17; F1, subparallel grooves; F2, subparallel grooves associated to a subcircular cluster of grooves (arrow).
Fig. 4 in New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus
Fig. 4. Feeding traces of Osteocallis on bone fragments of the rhynchosaurid archosauromorph Hyperodapedon mariensis (Tupi Caldas, 1933) from Buriol Site, Brazil, Hyperodapedon AZ, Carnian. A. UFRGS-PV-1581 #3; A1, Osteocallis mandibulus Roberts et al., 2007, associated to arthropod bioerosion trace fossil Amphifaoichnus isp.; A2, details of one of the trails. B. UFRGS-PV-1581 #23; B1, Osteocallis mandibulus associated to a cluster of grooves in crescent shape; B2, schematic drawing highlighting the grooves. C. UFRGS-PV-1581-T #12 showing two overlapping Osteocallis infestans Paes Neto et al., 2016. D. UFRGS-PV-1581-T #11 showing Osteocallis isp. (arrow) associated to a cluster of larger grooves.
Fig. 2 in New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus
Fig. 2. Identified cranial elements of the rhynchosaurid archosauromorph Hyperodapedon mariensis (Tupi Caldas, 1933) in UFRGS-PV-1581-T from Buriol Site, Brazil, Hyperodapedon AZ, Carnian. A. Left dentary in lateral view (A1) and medial view (A2) showing the dentary blade with at least one lingual tooth arrow). B. Left and right dentaries in dorsal view. C. Partial left pterygoid in medial view. D. Right maxilla in ventral view. E. Left maxilla in ventral view.
Fig. 8 in New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus
Fig. 8. Indiscrete borings on bone fragments of the rhynchosaurid archosauromorph Hyperodapedon mariensis (Tupi Caldas, 1933) from Buriol Site, Brazil, Hyperodapedon AZ, Carnian. A. UFRGS-PV-1581-T #3; A1, a boring in the opposite face of the arthropod bioerosion trace fossil Amphifaoichnus, but also penetrating it; A2, close up view showing the presence of bone chips in the base of the boring. B. UFRGS-PV-1581-T #7 showing a boring with one rounded termination. C. UFRGS-PV-1581-T #9; C1, an elongated boring with a rounded termination and bone chips scattered on the base; C2, close up view highlighting the bone chips scattered on the base.
Fig. 1. Geological and geographic context. A in New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus
Fig. 1. Geological and geographic context. A. Location of the Paraná Basin in Brazil. B. Limits of the Triassic rocks of Rosário do Sul Group and the Triassic rocks of Paraná Basin in Rio Grande do Sul state. C. Location of the Buriol Site, locality of UFRGS-PV-1581-T, and nearby Predebon and Janner sites. D. Chrono-, lito-, and biostratigraphy of southern Brazilian Triassic (modified from Schultz et al. 2020). Arrow indicates stratigraphical position of UFRGS-PV-1581-T; * refers to absolute ages from Langer et al. (2018); ** refers to absolute ages from Philipp et al. (2018).
Fig. 7 in New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus
Fig. 7. Subcircular clusters on bone fragments of the rhynchosaurid archosauromorph Hyperodapedon mariensis (Tupi Caldas, 1933) from Buriol Site, Brazil, Hyperodapedon AZ, Carnian. A. UFRGS-PV-1581-T #17; A1, subcircular cluster connected to a cluster of grooves; A2, schematic drawing. B. UFRGS-PV-1581-T #13; B1, subcircular cluster associated to an irregular cluster of grooves (arrow), possibly a partially preserved subcircular cluster; B2, schematic drawing. C. UFRGS-PV-1581-T #16 showing an isolated subcircular cluster of grooves.
Fig. 3 in New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus
Fig. 3. Arthropod bioerosion trace fossil Amphifaoichnus isp. on bone fragments of the rhynchosaurid archosauromorph Hyperodapedon mariensis (Tupi Caldas, 1933) from Buriol Site, Brazil, Hyperodapedon AZ, Carnian. A. UFRGS-PV-1581-T #3; A1, close up showing Amphifaoichnus isp. (note the bone chips) associated to a perpendicular boring (dashed outline) and feeding traces of Osteocallis mandibulus Roberts et al., 2007 (arrow; see also Fig. 4A1); A2, axial view of µCT scan showing the internal morphology of the tube, meniscate structures and the perpendicular boring; A3, coronal view of µCT scan showing the trace (dotted surface) and the destruction of both cortical (black outline) and trabecular bone. B. UFRGS-PV-1581-T #4; B1, specimen arrow) showing the uneven distribution of bone chips in the filling; B2, specimen in transversal view showing the rounded morphology of the filling. C. UFRGS-PV-1581-T #10; C1, specimen in negative relief with a small portion of filling still preserved (arrow); C2, close up of filling; C3, specimen in transversal view showing the U-shape of the boring.
Fig. 9 in New bioerosion traces in rhynchosaur bones from the Upper Triassic of Brazil and the oldest occurrence of the ichnogenera Osteocallis and Amphifaoichnus
Fig. 9. Reconstruction of insect exploration on bone fragments of the rhynchosaurid archosauromorph Hyperodapedon mariensis (Tupi Caldas, 1933) in UFRGS-PV-1581-T. Insect activity is depicted as occurring both in exposed and buried portions of the carcass (see the text for other hypotheses). Reconstuction by Zeinner de Paula.
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