Abstract:The larger foraminifera found in the material from the Chichen Itzá Formation of Campeche (SE Mexico) were studied in detail. The architectural analyses allow the description of four new species and a new genus, namely, two agglutinated conical foraminifera, Coskinolina yucatanensis n.sp. and Pseudofallotella drobneae n. gen. n.sp., one new alveolinid, Borelis hottingeri n.sp., and one new rotaliid, Dictyoconoides boneti n.sp. The larger foraminifera of the Chichen Itzá Formation are distributed across two different associations: one includes Pseudofallotella drobneae, Neotaberina sp., Rhabdorites sp., Borelis hottingeri, Dictyoconoides boneti, Kathina sp., Miscellaneidae, Ranikothalia soldadensis and Hexagonocyclina cristensis, while the other assemblage is composed of Coskinolina yucatensis, Fallotella causae, Rhabdorites sp., Borelis floridanus and Cincoriola cf. ovoidea. Some of these genera, including Neotaberina and Dictyoconoides, are cited in the Caribbean paleobioprovince for the first time in this paper. The first association is dated as Thanetian (SBZ 3? to SBZ 4) by the presence of Ranikothalia soldadensis. Though the age of the second association remains uncertain, a similar age has been inferred.Key Words: Paleocene; Yucatán; Mexico; larger foraminifera; biostratigraphy. Résumé : Les grands foraminifères paléocènes de la péninsule du Yucatán (SE du Mexique).-Les grands foraminifères observés dans du matériel provenant de la Formation Chichen Itzá de l'État de Campeche (SE Mexique) ont été étudiés en détail. Des analyses de leur architecture ont permis de décrire quatre nouvelles espèces et un nouveau genre, deux foraminifères coniques à test agglutinant, Coskinolina yucatanensis n.sp. et Pseudofallotella drobneae n.gen. n.sp., un nouvel alvéolinidé, Borelis hottingeri n.sp., et un nouveau rotaliidé, Dictyoconoides boneti n.sp. Les grands foraminifères de la Formation Chichen Itzá sont groupés dans deux associations distinctes : une première avec Pseudofallotella drobneae, Neotaberina sp., Rhabdorites sp., Borelis hottingeri, Dictyoconoides boneti, Kathina sp., Miscellaneidae, Ranikothalia soldadensis et Hexagonocyclina cristensis, une seconde avec Coskinolina yucatensis, Fallotella causae, Rhabdorites sp., Borelis floridanus et Cincoriola cf. ovoidea. Quelques-uns de ces genres, notamment Neotaberina et Dictyoconoides, sont signalés ici pour la première fois dans la province paléobiogéographique caraïbéenne. La première association est datée du Thané-tien (SBZ 3? à SBZ 4) du fait de la présence de Ranikothalia soldadensis. Bien qu'il y ait encore une incertitude quant à l'âge de la seconde association, nous avons retenu la même position stratigraphique. Mots-clefs :Paléocène ; Yucatán ; Mexique ; grands foraminifères ; biostratigraphie.Resumen: Los macroforaminíferos del Paleoceno de la península de Yucatán (SE México).-Los macroforaminíferos encontrados en el material procedente de la Formación Chichen Itzá en Campeche (SE México) han sido estudiados en detalle. Los análisis arquitectura...
This paper revises the architecture of the Paleocene foraminiferal genus Taberina based on reexamination of the type species, T. cubana, from Cuba, supplemented by specimens collected from the Lacandón Formation of SE Mexico. Taberina shells exhibit an initial subglobular shape, later becoming conical to peneropliform. They have multiple apertures and the stolon axes follow a radial pattern. Structural elements consist of septula situated in the peripheral part of the chamber lumen and thick, irregularly shaped pillars located in the central part. The architecture of typical Taberina differs from those of other ''taberinas'' described from the Middle East, such as the Cenomanian ''T.'' bingistani and Paleocene ''T .'' daviesi, both of which must be removed from the genus. Other taxa of larger benthic foraminifers found in the Lacandón Formation include: Ranikothalia bermudezi, ''Quasiborelis'' floridanus, Rhabdorites? sp., Praerhapydionina sp., Miscellanea? nassauensis, Neomurciella cf. N. butterlini, Raadshoovenia guatemalensis, and rotaliids. The age of T. cubana is Paleocene SBZ 2 and SBZ 3, and the species is known only from the Caribbean/American paleobioprovince.
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