New dyrosaurid crocodylomorph and evidences for faunal turnover at the K–P transition in Brazil

Barbosa, José Antônio; Kellner, Alexander W. A.; Viana, Maria Somália Sales

doi:10.1098/rspb.2008.0110

Cited by 84 publications

(99 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This feature has not been described by Barbosa et al (2008) for the holotype of Guarinisuchus munizi. Its anteromedial branch has a rugose depression, probably to meet the frontal ( Figure 3A).…”

Section: Description and Comparisonmentioning

confidence: 73%

“…The postorbital fragment (CAV 0072-V) measures 60 mm; it is broken and incomplete ( Figure 2). It is possible to identify this bone as a part of an anterior portion of the right postorbital, since this bone in Dyrosauridae is very elongated (Barbosa et al, 2008). It has a dorsal surface ornamented by pits and a broad anterior branch with a welldeveloped anterolateral process that constitutes the postorbital spur as observed in an unnumbered specimen described by Buffetaut (1976) and the specimen Vb 602 (currently UPMC)…”

Section: Description and Comparisonmentioning

confidence: 95%

“…We are unable to assess the total length of the symphysis in the holotype of G. munizi, because the anterior portion in DG-CTG-UFPE 5723 is missing. The symphysis in the holotype of G. munizi ends approximately at the position of the d14 alveolus (Barbosa et al, 2008). In Acherontisuchus guajiraensis the symphysis extends posteriorly to the position of the d17 alveolus in UF/IGM 34, and between the d18 and d19 alveoli in UF/IGM 35 (Hastings et al, 2011).…”

Section: Description and Comparisonmentioning

confidence: 99%

“…Scarce material of one pterosaur was also described from the Gramame Formation, Nyctosaurus lamegoi Price, 1953b. Remains of crocodiles and turtles have been recovered from the Maria Farinha Formation (Price, 1953b;Gallo et al, 2001;Oliveira & Romano, 2007;Silva et al, 2007;Barbosa et al, 2008;Oliveira & Deantoni, 2013;Carvalho et al, 2016;Romano, 2016 …”

Section: Geological Settingmentioning

confidence: 99%

See 3 more Smart Citations

New dyrosaurid remains (Crocodyliformes, Mesoeucrocodylia) from the Paleocene of the Paraíba Basin, NE Brazil

Sena¹,

Andrade²,

Bantim³

et al. 2017

Rev. bras. paleontol.

Self Cite

View full text Add to dashboard Cite

-The fossil crocodyliforms from the Paraíba Basin in Northeastern Brazil are represented by two species, Hyposaurus derbianus, (uncertain age) and Guarinisuchus munizi, from the Paleocene Maria Farinha Formation. Herein we present new material of a dyrosaurid also collected in deposits of the Maria Farinha Formation, representing cranial, axial and appendicular remains. The specimens are housed at Centro Acadêmico de Vitória, Universidade Federal de Pernambuco (CAV-UFPE) and at Universidade Federal Rural de Pernambuco (UFRPE). The most important contribution of this find is a well-preserved mandibular specimen (CAV 0056-V) with 16 alveoli on the left side and 13 on the right side. Nine complete or partial tooth crowns are preserved, in positions 1-5. The teeth are conical and homodont with vertical striations. The largest teeth are located at positions d1 and d4. The biggest occlusion pits are located between positions d2 and d3. The seventh alveoli are reduced and close to the eighth alveoli. The mandible, CAV 0056-V, possesses three foramina in the anterior portion of the dentaries and the mandibular symphysis extends to the posterior margins of the d11-d12 dentary alveoli. Based on the features presented in the mandible and the other fossils recovered, we attribute these materials to Dyrosauridae, particularly, to Guarinisuchus cf. G. munizi. Key words:Crocodyliformes, Dyrosauridae, NE Brazil, Paleocene, Paraíba Basin. RESUMO -Os Crocodyliformes fósseis da Bacia da Paraíba, Nordeste brasileiro, são representados por duas espécies, Hyposaurus derbianus de idade incerta e Guarinisuchus munizi, dos estratos paleocênicos da Formação Maria Farinha. Aqui são apresentados novos materiais de dyrossaurídeo da Formação Maria Farinha, representados por fragmentos craniais, axiais e apendiculares. Os espécimes estão armazenados no Centro Acadêmico de Vitória da Universidade Federal de Pernambuco (CAV-UFPE) e na Universidade Federal Rural de Pernambuco (UFRPE). O novo material contém uma mandíbula bem preservada (CAV 0056-V), com 16 alvéolos do lado esquerdo e 13 do lado direito. Nove coroas dentárias estão preservadas total ou parcialmente completas, nas posições 1-5. Os dentes são homodontes com forma cônica e estrias verticais. Os dentes de maior comprimento estão localizados nas posições d1 e d4. As maiores marcas de oclusão ocorrem entre as posições d2 e d3. Os alvéolos d7 apresentam dimensões reduzidas e ocorrem próximos aos alvéolos d8. A mandíbula, CAV 0056-V apresenta três forames na porção anterior dos dentários e a sínfise mandibular estende-se até a borda posterior dos alvéolos dentários d11-d12. Portanto, fundamentado nas características apresentadas na mandíbula e pelos outros espécimes, nós associamos estes materiais à Dyrosauridae, particularmente, Guarinisuchus cf. G. munizi.

show abstract

Section: Description and Comparisonmentioning

confidence: 73%

Section: Description and Comparisonmentioning

confidence: 95%

Section: Description and Comparisonmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

See 2 more Smart Citations

New dyrosaurid remains (Crocodyliformes, Mesoeucrocodylia) from the Paleocene of the Paraíba Basin, NE Brazil

Sena¹,

Andrade²,

Bantim³

et al. 2017

Rev. bras. paleontol.

Self Cite

View full text Add to dashboard Cite

show abstract

“…Outra interessante contribuição brasileira à pesquisa dos crocodilomorfos foi o estudo demonstrando que os dirossaurídeos (formas marinhas) eram encontrados em menor diversidade e número antes da extinção em massa ocorrida há aproximadamente 66 milhões de anos no limite entre o Cretáceo e o Paleógono (K-Pg), mas que se tornaram os principais predadores marinhos após o K-Pg (41). Segundo o estudo, esse domínio somente foi possível pelo fato de alguns grupos de répteis marinhos, em especial os mosassauros (largartos marinhos), que competiam com os dirossaurídeos antes do K-Pg, terem sido extintos.…”

unclassified

O estudo dos répteis fósseis-cresce a contribuição da ciência brasileira

Kellner

2015

Cienc. Cult.

View full text Add to dashboard Cite

Body Size Evolution in Crocodylians and Their Extinct Relatives

Godoy

Turner

2020

Encyclopedia of Life Sciences

View full text Add to dashboard Cite

Crocodylians are currently facing evolutionary decline. This is evinced by the rich fossil record of their extinct relatives, crocodylomorphs, which show not only significantly higher levels of biodiversity in the past but also remarkable morphological disparity and higher ecological diversity. In terms of body size, crocodylians are mostly large animals (>2 m), especially when compared to other extant reptiles. In contrast, extinct crocodylomorphs exhibited a 10‐fold range in body sizes, with early terrestrial forms often quite small. Recent research has shed new light on the tempo and mode of crocodylomorph body size evolution, demonstrating a close relationship with ecology, in which physiological constraints contribute to the larger sizes of marine species. Abiotic environmental factors can also play an important role within individual subgroups. Crocodylians, for instance, have been experiencing an average size increase during Cenozoic, which seems to be related to a long‐term process of global cooling. Key Concepts Although Crocodylia is currently a depauperate group, the fossil record of its closest extinct relatives, crocodylomorphs, can provide important evidence to answer major evolutionary questions, such as on extinction and diversity loss. Crocodylomorph body size has varied significantly over time, as well as between subgroups, ranging from relatively small (<1 m) to gigantic (>10 m) species. Crocodylomorph body size evolution is not consistent with an overall trend towards large or smaller sizes through time; instead, multiple shifts to different evolutionary regimes can explain the observed body size values. Climate alone cannot explain the evolution of body size in all crocodylomorphs, but some environmental factors had stronger influence on individual subgroups. The usually larger sizes of aquatic and marine crocodylomorphs can be explained by physiological constraints associated with thermoregulation and lung capacity when under the water. A strong correlation between temperature and body size found for members of the crown‐group (Crocodylia) indicates that species became larger on average as the world became cooler during the Cenozoic.

show abstract

New dyrosaurid crocodylomorph and evidences for faunal turnover at the K–P transition in Brazil

Cited by 84 publications

References 24 publications

New dyrosaurid remains (Crocodyliformes, Mesoeucrocodylia) from the Paleocene of the Paraíba Basin, NE Brazil

New dyrosaurid remains (Crocodyliformes, Mesoeucrocodylia) from the Paleocene of the Paraíba Basin, NE Brazil

O estudo dos répteis fósseis-cresce a contribuição da ciência brasileira

Body Size Evolution in Crocodylians and Their Extinct Relatives

Contact Info

Product

Resources

About