The Marine Crocodilian Hyposaurus in North America

Denton, Robert K.; Dobie, James L.; Parris, David C.

doi:10.1016/b978-012155210-7/50020-x

Cited by 40 publications

(83 citation statements)

References 4 publications

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“…Salih et al (2015) described this feature in a specimen attributed to Hyposaurus from ?Campanian-Maastrichtian deposits of Sudan. In North America, Denton et al (1997) mentioned this feature for Hyposaurus rogersii found in Danian deposits (Wiest et al, 2016). In the Paleocene of Colombia, Hastings et al (2010) recorded it for Cerrejonisuchus improcerus, and in the Eocene of Morocco Jouve et al (2006) recognized it in Dyrosaurus maghribensis.…”

Section: Discussionmentioning

confidence: 99%

“…The teeth have a circular cross section and their labial and lingual surfaces are marked by well-developed, straight carinae. The 'twisted' carina characteristic of Hyposaurus (NJSM 12293) (Denton et al, 1997) is not present. The tooth crowns are posteriorly curved, which is a feature present in other dyrosaurids (Cope, 1886;Barbosa et al, 2008), and they also present a broad base and acute apex.…”

Section: Description and Comparisonmentioning

confidence: 99%

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

Sena¹,

Andrade²,

Bantim³

et al. 2017

Rev. bras. paleontol.

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-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.

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Section: Discussionmentioning

confidence: 99%

Section: Description and Comparisonmentioning

confidence: 99%

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

Sena¹,

Andrade²,

Bantim³

et al. 2017

Rev. bras. paleontol.

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“…In crocodylians and relatives, the vertebrae fuse from the tail forward (Brochu 1996). Nonetheless, G. munizi appears to be smaller than most dyrosaurid taxa known so far except for H. rogersii from the Maastrichtian of the USA (Denton et al 1997).…”

Section: Description and Comparisonmentioning

confidence: 97%

“…The teeth are long, show strong striations and unserrated anterior and posterior carinae (figure 2i ). They lack the particular medially 'twisted' anterior carina reported in Hyposaurus (Denton et al 1997). The anterior-most teeth are arched, curving posteriorly.…”

Section: Description and Comparisonmentioning

confidence: 98%

“…These long-snouted extinct marine crocodylomorphs are known mainly from the Maastrichtian deposits of New Jersey (Owen 1849;Denton et al 1997) and the Late Cretaceous to Early Palaeogene units formed by the Tethys Sea in northern and western Africa (Swinton 1950;Halstead 1975;Buffetaut 1978aBuffetaut , 1981Brochu et al 2002;Jouve 2005;Jouve et al 2005a). Incomplete material is also known from the Palaeocene and Eocene strata of Pakistan (Buffetaut 1978b;Storrs 1986).…”

Section: Introductionmentioning

confidence: 99%

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

2008

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The discovery of a new dyrosaurid crocodylomorph from the well-dated Palaeocene deposits of northeastern Brazil sheds new light on the evolutionary history of this extinct group of marine crocodylomorphs that have survived the Cretaceous–Palaeogene (K–P) extinction crisis. Guarinisuchus munizi , the most complete member of this group collected in South America so far, is closely related to the African forms, and this fact suggests that dyrosaurids had crossed the Atlantic Ocean before the K–P boundary and dispersed from there to North America and other parts of South America. This discovery also suggests that on the coast of northeastern Brazil, dyrosaurids replaced the pre-existing Late Cretaceous fauna of diversified mosasaurs, a group of marine lizards, after the K–P extinction event, becoming the main predators, together with sharks, in shallow marine Palaeocene environments. More detailed stratigraphic records and detailed dating of the deposits with dyrosaurids are necessary to correlate this particular pattern found in the ancient northeastern Brazilian coast within the evolution of the group, especially in Africa.

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New data on the Dyrosauridae (Crocodylomorpha) from the Paleocene of Togo

Amoudji

Guinot

Hautier

et al. 2021

Annales de Paléontologie

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Following our fieldwork in Paleogene deposits of Togo, we herein report cranial as well as postcranial elements belonging to the family Dyrosauridae. This assemblage is dated to the Late Paleocene (Thanetian) from two quarries in southern Togo. The specimens include a partial skull presenting two large supratemporal fossae and a massive occipital condyle; long and slender isolated teeth; amphicoelous vertebrae including several articulated ones; and two osteoderms 1 influencé la distribution géographique des Dyrosauridae. Ces restes inédits de Dyrosauridae confirment d'une part la présence de ce groupe au Paléocène au Togo et accentuent d'autre part le potentiel fossilifère du bassin sédimentaire côtier du Togo et des dépôts contemporains de la baie du Bénin.

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The Marine Crocodilian Hyposaurus in North America

Cited by 40 publications

References 4 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

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

New data on the Dyrosauridae (Crocodylomorpha) from the Paleocene of Togo

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