Gustavo Luís’s scientific contributions

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Publications (1)

Figure 1. Location map of the study area within the Coastal Plain of Rio Grande do Sul (CPRS, represented in light grey). The study area encompasses a region that stretches between Cassino beach (Rio Grande, RS) and Hermenegildo beach (Santa Vitória do Palmar, RS). Red symbols indicate the location where samples were collected.
Figure 2. Orientation and terminology of a hypothetical shark vertebral centra including the most common features, adapted from Applegate (1967), Welton & Farish (1993), Burris (2004) and Moreira et al. (2019). A, left lateral view of a shark vertebral column showing a series of vertebral centra and associated cartilages of neural and hemal arches; B, transversal view of a cross sectioned hypothetical anterior caudal vertebra, showing the terminology; C, ventraloblique view of a in; D, sagittal cut of a vertebral centrum.
Figure 3. Illustration indicating the progressive ventral migration of the basiventral insertions for the hemal arches in the anteroposterior axis of a hypothetical shark column.
Figure 5. X-ray images of vertebral centra from CPRS. A-C, Lamnoid vertebral centra from the thoracic region (LGP/C338, LGP/C415, and LGP/C351); D-F, Carcharhinoid morphotype vertebral centra from the caudal region, (LGP/C434, LGP/C358, and LGP/C342); G-I, vertebral centra whose body location or inner structures could not be identified (LGP/C344, LGP/C359, and LGP/C356). White arrow indicates basidorsal insertions for the neural arches and yellow arrow indicates basiventral insertions for hemal arches. Scale bars = 10 mm.
Shark (Neoselachii) vertebral centra from the Quaternary of southern Brazil
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August 2024

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343 Reads

Revista Brasileira de Paleontologia

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Gustavo Luís

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We describe for the first time in the Lago Colhué Huapi Formation (Coniacian–Maastricthian), south Central Patagonia, Argentina, continental bioerosion traces on dinosaur remains. Specifically, six different morphotypes, showing also different morphologic patterns, were identified. The preliminary identification of the trace makers include: crocodyliform, possibly a peirosaurid notosuchian (morphotypes A and B), a theropod dinosaur (morphotype C), and the activity of arthropod pupation (morphotype D), and insects such as termites and dermestids (morphotypes E and F). This study increases our knowledge about the biodiversity registered to the moment in the Lago Colhué Huapi Formation and specifically for the “middle section” of this formation, probably Santonian–early Maastrichtian in age. These bioerosion traces support a warm climate with periods of semi-aridity or at least drier conditions as it was proposed for this interval of time in this section of the formation. Keywords: bone modification, ichnofossils, Late Cretaceous.

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