Masiakasaurus-like theropod teeth from the Alcântara Formation, São Luís Basin (Cenomanian), northeastern Brazil

Lindoso, Rafael Matos; Medeiros, Manuel Alfredo; Carvalho, Ismar de Souza; Marinho, Thiago da Silva

doi:10.1016/j.cretres.2012.03.002

Cited by 22 publications

(5 citation statements)

References 23 publications

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“…As such, it contrasts to the highly modified rostral teeth of Mas . knopfleri 2 , or isolated Masiakasaurus -like teeth from the Early Cretaceous of Brazil 65 . However, when compared with other theropods (including abelisauroids 12,60,66–68 ), the combination of a “D-shaped” cross section and both carinae located in the lingual part of the tooth, indicates that it belongs to the same part of the jaw, i.e.…”

Section: Resultsmentioning

confidence: 99%

A new desert-dwelling dinosaur (Theropoda, Noasaurinae) from the Cretaceous of south Brazil

Langer

Martins²,

Manzig³

et al. 2019

Sci Rep

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Noasaurines form an enigmatic group of small-bodied predatory theropod dinosaurs known from the Late Cretaceous of Gondwana. They are relatively rare, with notable records in Argentina and Madagascar, and possible remains reported for Brazil, India, and continental Africa. In south-central Brazil, the deposits of the Bauru Basin have yielded a rich tetrapod fauna, which is concentrated in the Bauru Group. The mainly aeolian deposits of the Caiuá Group, on the contrary, bear a scarce fossil record composed only of lizards, turtles, and pterosaurs. Here, we describe the first dinosaur of the Caiuá Group, which also represents the best-preserved theropod of the entire Bauru Basin known to date. The recovered skeletal parts (vertebrae, girdles, limbs, and scarce cranial elements) show that the new taxon was just over 1 m long, with a unique anatomy among theropods. The shafts of its metatarsals II and IV are very lateromedially compressed, as are the blade-like ungual phalanges of the respective digits. This implies that the new taxon could have been functionally monodactyl, with a main central weight-bearing digit, flanked by neighbouring elements positioned very close to digit III or even held free of the ground. Such anatomical adaptation is formerly unrecorded among archosaurs, but has been previously inferred from footprints of the same stratigraphic unit that yielded the new dinosaur. A phylogenetic analysis nests the new taxon within the Noasaurinae clade, which is unresolved because of the multiple alternative positions that Noasaurus leali can acquire in the optimal trees. The exclusion of the latter form results in positioning the new dinosaur as the sister-taxon of the Argentinean Velocisaurus unicus .

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Section: Resultsmentioning

confidence: 99%

A new desert-dwelling dinosaur (Theropoda, Noasaurinae) from the Cretaceous of south Brazil

Langer

Martins²,

Manzig³

et al. 2019

Sci Rep

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“…Though limited in number and incompletely preserved, the morphology of the dinosaur teeth described here is diagnostic enough to assign them to abelisaurids. Abelisauroid dinosaurs had a typical Gondwanan distribution with known occurrences in the Middle Jurassic to Late Cretaceous deposits of South America (Bonaparte & Novas ; Lamanna et al ; Lindoso et al ; Pol & Rauhut ), Africa (Sereno et al ; Mahler ; Smith & Dalla Vecchia ; Smith & Lamanna ), Madagascar (Sampson et al ; Smith ), India (von Huene & Matley ; Wilson et al ; Novas et al ) and sporadic reports from Europe (Buffetaut et al ; Astibia et al ). Phylogenetic analysis has shown that abelisaurid taxa Rajasaurus and Indosuchus from the Upper Cretaceous Lameta Group of India share sister group relationship with Majungasaurus from the Upper Cretaceous (Maastrichtian) Maevarano Formation of Madagascar (Carrano & Sampson ).…”

Section: Discussionmentioning

confidence: 99%

Isolated Archosaur teeth from the green sandstone capping the Coralline Limestone (Bagh Group) of the Narmada valley: Evidence for the presence of pre‐Late to Late Maastrichtian abelisaurids in India

Prasad

Verma²,

Grover

et al. 2016

Island Arc

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Recent field prospecting in the Cretaceous sequences of the lower Narmada valley has led to the discovery of three isolated archosaur teeth from the upper part of marine Cretaceous rocks of the Bagh Group. The specimens were recovered by surface prospecting from an oyster-bearing green sandstone bed occurring at the top of the Coralline Limestone (Coniacian) from a site near Phutibawri village, Dhar District, Madhya Pradesh, India. Of the three teeth recovered from this horizon, two are identified with abelisaurid dinosaurs and the third one with an indeterminate crocodile. The abelisaurid teeth conform to the premaxillary and maxillary tooth morphology of Majungasaurus and Indosuchus. Earlier reports of abelisaurid dinosaurs from India are from the Upper Cretaceous (Maastrichtian) Lameta Group of Jabalpur, Pisdura (Central India) and Balasinor (Western India) and Upper Cretaceous (Late Maastrichtian) Kallamedu Formation (South India). As no associated age diagnostic fossils are found, the specimens described here are considered to represent pre-Late to Late Maastrichtian age based on the known ages of the underlying and overlying formations. The new finds, therefore, document stratigraphically the oldest occurrence of abelisaurid dinosaurs known from the Indian subcontinent.

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“…The teeth of Vitakridrinda are triconvex and triangular and slight to strongly compressed sidewise to oval, while Indosuchus teeth are subequal antero-posterior and transverse diameter and highly compressed sidewise and noasaurid theropod teeth from Brazil which are elliptical [34]. Vitakridrinda teeth are triconvex with core large core cavity enveloped by blue enamel and then outer white enamel layer make differentiation from Indosuchus teeth and theropod teeth from India.…”

Section: Description Of Fossils Of Vitakridrinda Sulaimani Theropodmentioning

confidence: 98%

Theropods, Mesoeucrocodiles and Pterosaurs Found from the Latest Maastrichtian Vitakri Formation of Balochistan, Pakistan; Description with Large Photographs and Comparison with Coeval Taxa from Indo-Pakistan Subcontinent

Malkani¹

2020

OJG

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Theropods, mesoeucrocodiles and pterosaurs (along with titanosaurian sauropods) are found in two overbank flood deposited mottled muds/shale units (alternated by meandering river deposited sandstone unit) of the latest Maastrichtian (67-66 Ma) Vitakri Formation, Barkhan District, Balochistan, Pakistan. These vertebrates coexisted under the Cretaceous-Paleogene boundary line of control and became extinct as mass extinction. Previously these taxa lack the detail description but here theropods, mesoeucrocodiles and pterosaur from Pakistan are being described well with large photographs which provide better understanding of fauna from Pakistan and comparison with coeval taxa from Indo-Pakistan subcontinent. These fauna with associated cranial and postcranial skeletons are significant for Gondwanan paleobiogeography and phylogenetic studies.

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Masiakasaurus-like theropod teeth from the Alcântara Formation, São Luís Basin (Cenomanian), northeastern Brazil

Cited by 22 publications

References 23 publications

A new desert-dwelling dinosaur (Theropoda, Noasaurinae) from the Cretaceous of south Brazil

A new desert-dwelling dinosaur (Theropoda, Noasaurinae) from the Cretaceous of south Brazil

Isolated Archosaur teeth from the green sandstone capping the Coralline Limestone (Bagh Group) of the Narmada valley: Evidence for the presence of pre‐Late to Late Maastrichtian abelisaurids in India

Theropods, Mesoeucrocodiles and Pterosaurs Found from the Latest Maastrichtian Vitakri Formation of Balochistan, Pakistan; Description with Large Photographs and Comparison with Coeval Taxa from Indo-Pakistan Subcontinent

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