Bennettitales from the Middle Jurassic of northwestern Oaxaca, Mexico: Diversity, sedimentary environments, and phytogeography

Lozano-Carmona, Diego E.; León, María Patricia Velasco-de

doi:10.1016/j.jsames.2021.103404

Cited by 8 publications

(2 citation statements)

References 24 publications

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“…In both countries, this genus has low abundance and diversity, unlike Williamsonia and Weltrichia (Brongniart) Harris, which are present in all the Jurassic formations of Mexico. In the localities where these rocks crop out, the diversity of these genera includes more than two species in many cases (Delevoryas 1991;Silva-Pineda et al, 2011;Velasco-de León et al, 2019;Lozano-Carmona, 2021). Even though there are no analyses of reproductive systems of gymnosperms, the discovery of new genera will allow future comparisons of seed number, as reported by Crane and Herenden (2009) (higher in bisexual structures), which is interpreted as an evolutionary strategy of plants to colonize new environments.…”

Section: Current Knowledge Of the Paleofloramentioning

confidence: 98%

New records of Bennettitales and associated flora from the Jurassic of the Cualac Formation, Mexico

Velasco de León,

Ortiz Martínez,

Flores Barragan

et al. 2024

Palaeontol Electron

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The present work contributes to the palaeofloristic knowledge of the Jurassic in the Cualac Formation of Mexico with the first records of the genera Anomozamites, Cycadolepis, Czekanowskia, Mexiglossa, and Williamsoniella. A new species of bisexual structure, Williamsonia rosarensis, is described; the species Zamites diquiyui is emended and the cuticular characters of the dominant species Mexiglossa varia are described for the first time. These data substantially increase the plant diversity of this stratigraphic unit and provide information about the environment in which they were preserved. These new reports come from a new locality of the Cualac Formation, in the state of Oaxaca, Mexico, called Rosario. After considering some sedimentological and taphonomic aspects, it is proposed that this locality represented an alluvial fan depositional environment that evolved into a flood plain, which favored the state of preservation of the specimens, and even preserved cuticular characters that allows an updated and more detailed taxonomy of three species. A notable find is Williamsoniella rosarensis nov. sp., a genus which has been previously reported from two Middle Jurassic localities in the UK and one in Mexico. A possible organic connection between this structure and leaves of Zamites diquiyui is also proposed. The findings mentioned above indicate that Bennettitales is the most abundant order (61.4%) with eight genera and 15 species. The present contribution confirms that paleofloristic lists are still incomplete, and thus it is necessary to continue the work in the Jurassic formations described for Mexico.

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Section: Current Knowledge Of the Paleofloramentioning

confidence: 98%

New records of Bennettitales and associated flora from the Jurassic of the Cualac Formation, Mexico

Velasco de León,

Ortiz Martínez,

Flores Barragan

et al. 2024

Palaeontol Electron

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“…They are differentiated into two large groups: Cycadeoideaceae and Williamsoniaceae (Taylor et al 2009). During the Jurassic and Early Cretaceous, the group reached its maximal diversity (Harris 1969, Barale 1981, Pott et al 2014, McLoughlin et al 2017, Lozano-Carmona and Velasco 2021.…”

Section: Introductionmentioning

confidence: 99%

New species of Zamites from the Cenomanian of the Bohemian Cretaceous Basin

Kvaček¹

2022

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Zamites pateri J.Kvaček is described as a new member of the Bennettitales from the Cenomanian of the Peruc-Korycany Formation, Bohemian Cretaceous Basin in the Czech Republic. It comes from fluvial sediments exposed in the Pecínov quarry. It is compared to Zamites bayeri J.Kvaček from the Peruc-Korycany Formation, from which it differs in having pinnae attached to the dorsal part of the rachis and in cuticular details, particularly in having costal zones narrower than intercostal zones, stomata orientated always perpendicularly to the leaf margins and a thinner adaxial cuticle. Epidermal characters, particularly sunken stomata and numerous papillae underpin the mesophytic/xerophytic nature of the plant fossil.

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Paleontological research in Mexico: A brief account of current studies from the Sociedad Mexicana de Paleontología

Chacón

Moreno‐Bedmar

Cuen-Romero

et al. 2022

Journal of South American Earth Sciences

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Bennettitales from the Middle Jurassic of northwestern Oaxaca, Mexico: Diversity, sedimentary environments, and phytogeography

Cited by 8 publications

References 24 publications

New records of Bennettitales and associated flora from the Jurassic of the Cualac Formation, Mexico

New records of Bennettitales and associated flora from the Jurassic of the Cualac Formation, Mexico

New species of Zamites from the Cenomanian of the Bohemian Cretaceous Basin

Paleontological research in Mexico: A brief account of current studies from the Sociedad Mexicana de Paleontología

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