ALEXANDER WILHELM's scientific contributions

Publications (3)

Article
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A new titanosaurid, Baurutitan britoi n. gen., n. sp., is described and compared with other taxa of that sauropod clade. The specimen (MCT 1490-R) consists of the last sacral followed by a sequence of 18 caudal vertebrae that were found in the continental deposits of the Late Cretaceous Bauru Group that outcrop at the Peirópolis region, near the to...
Article
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2, 6, 7 ABSTRACT: Up to date, turtle remains from the Early Cretaceous Santana Formation were only described from the Romualdo Member (Aptian-Albian) and four species are known: Araripemys barretoi Price, 1973 (Pleurodira: Araripemydidae); Santanachelys gaffneyi Hirayama, 1998 (Cryptodira: Protostegidae); Brasilemys josai Lapparent de Broin, 2000 (...
Article
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5 ABSTRACT: We report the occurrence of an isolated avian dorsal vertebra in Cretaceous strata of Morocco. The specimen was found near Erfoud oasis in the Tafilalt region of southeastern Morocco preserved in a reddish sandstone. It has a large neural canal (ratio height neural canal/cranial articulation surface = 0.67), a feature regarded as a syna...

Citations

... Herbivores are rare, with only occasional remains of sauropod dinosaurs reported (Lamanna and Hazegawa, 2014;Ibrahim et al., 2016), of which Rebbachisaurus is the only named taxon (Lavocat, 1954a). A diverse assemblage of crocodylomorphs is present (Sereno and Larsson, 2009), in addition to turtles (Gaffney et al., 2002;Gaffney et al., 2006), snakes (Rage andDutheil, 2008;Klein et al., 2017) amphibians (Rage andDutheil, 2008) and possibly birds (Riff et al., 2004). ...
... Following previous works (e.g., Mannion et al., 2013;Carballido and Sander 2014) the classification of the caudal vertebrae in anterior, middle and posterior elements was based on anatomical features, as for example the presence of transverse processes, the development of neural spines, pre-and postzygapophysis, and the relative length of their centra. Additionally, and given the incomplete preservation of these structures in MPCA-Pv 1500 we also followed other more complete sequence known for other related titanosaurs (e.g., Baurutitan britoi; Kellner et al., 2005). For the present description and analysis, the caudal sequence of Pellegrinisaurus was divided in three sections: anterior (caudals 1-6), middle (caudals 7-16), and posterior (caudals 17-28) caudal vertebrae. ...
... According to Romano and Azevedo ( 2006 ), volcanic activity during the Early Cretaceous, represented by basaltic magmatism of the Serra Geral Formation (Renne et al. 1992 ), might have isolated both lineages of eupleurodires. Differentiation and expansion of the Pelomedusoides had started at least by Aptian times throughout Africa and South America as evident in the fossil record, as it is shown by the earlier records of Araripemys and Pelomedusidae date to the Late Aptian in northeastern Brazil (Meylan 1996 ;Fielding et al. 2005 ;Oliveira and Kellner 2005 ) and Late Aptian in Gadoufaoua, Niger (Broin 1980 ;Lapparent de Broin 2000 ). Three pelomedusoid lineages from the end of the Lower Cretaceous in northeastern South America are recognized: Euraxemyididae, Bothremydidae, and Brasilemys . ...