2018
DOI: 10.1016/j.cretres.2017.09.021 View full text |Buy / Rent full text
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Abstract: Sampling of Cenomanian fossil-rich horizons within the La Luna Formation of two localities in the Zulia and Trujillo states (northern Venezuela) yielded numerous shark teeth belonging to various species within the order Lamniformes (Mackerel sharks). Twelve lamniform species were identified including three new species (Squalicorax lalunaensis sp. nov., Squalicorax moodyi sp. nov., Acutalamna karsteni gen. et sp. nov.) and the genus Microcarcharias gen. nov. is proposed to accommodate with the peculiar morpholo… Show more

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“…The low diversity, low number of species per family, and strong morphological and ecological disparity have often been used to characterize living lamniform species as representatives of relict clade that was once speciose and subsequently experienced a diversity decline during their evolutionary history (21,23,24), but that has not yet been demonstrated and understood. Drivers of their diversification dynamics and decline are unknown but have…”
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“…The low diversity, low number of species per family, and strong morphological and ecological disparity have often been used to characterize living lamniform species as representatives of relict clade that was once speciose and subsequently experienced a diversity decline during their evolutionary history (21,23,24), but that has not yet been demonstrated and understood. Drivers of their diversification dynamics and decline are unknown but have…”
mentioning
“…The fossil record of Cretaceous chondrichthyans from northern South America is poorly known with only few remains of lamniforms and ptychodonts from Colombia (Reinhart, 1951;Brito and Janvier, 2002;Carrillo-Briceño et al, 2016) and Venezuela (Moody and Maisey, 1994;Carrillo-Briceño, 2009Carrillo-Briceño et al, 2008;Carrillo-Briceño and Lucas, 2013;Guinot and Carrillo-Briceño 2018). Here we describe a piece of an articulated tooth set of †Protolamna ricaurtensis sp.…”
Section: Introductionmentioning
“…Overall, the Cretaceous record of lamniform sharks is well known, mostly from the Northern Hemisphere (e.g., Europe and North America, see Cappetta 2012), as these regions have been extensively studied since the 19th century. On the contrary, the fossil record of lamniform sharks in South America is represented exclusively by isolated dental elements of at least nine genera from the Upper Cretaceous of Argentina (Arratia and Cione, 1996;Bogan and Agnolin, 2010;Prámparo et al, 2013;Schroeter et al, 2014), Brazil (Maury, 1930;Oliveira, 1954;Rebouças and Silva Santos, 1956), Chile (Otero et al, 2013) and Venezuela (Moody and Maisey, 1994;Carrillo-Briceño et al, 2008;Guinot and Carrillo-Briceño 2018). Only few Lower Cretaceous records of lamniforms are known, such as †Priscusurus adruptodontus Kriwet, 2006, from the middle?…”
Section: Introductionmentioning
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“…The vertebrae of Lunaophis aquaticus were found exposed in a quarry of the Cementos Andinos company, 10 km northeast of Monay city (9°36.57' 06"N, 70°24'14"W), Municipo Candelaria, Trujillo State, Venezuela (Albino et al 2017). The fossils come from strata corresponding to the La Aguada Member of the La Luna Formation (Albino et al 2017;Guinot and Carrillo-Briceño 2018). A Cenomanian age for the La Aguada Member was determined by planktonic foraminifera and ammonites (Renz 1959).…”
Section: Geological Settingmentioning