Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Phytotaxa Année : 2018

Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America

Résumé

While analyzing the fossil diatom flora in one of the longest paleolimnological records (core PI-6) from Lake Petén-Itzá, lowland Guatemala, we encountered Aulacoseira Thwaites, Cyclotella (Kützing) and Discostella (Cleve & Grunow) Houk & Klee species appearing successively in the record. Among them, two new species that are assigned to the genus Cyclotella are described herein. Cyclotella petenensis sp. nov. is characterised by a coarse striation marked by a shadow line and a tangentially undulate central area with an arc of central fultoportulae. Cyclotella cassandrae sp. nov. has an elliptically shaped valve, coarse striae and a scattered ring of central fultoportulae in the central area. Classification and differences to similar taxa in the genus Cyclotella are discussed.

Domaines

Paléontologie
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Dates et versions

hal-02013950 , version 1 (12-02-2019)

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Christine Paillès, Florence Sylvestre, Jaime Escobar, Alain Tonetto, Sybille Rustig, et al.. Cyclotella petenensis and Cyclotella cassandrae, two new fossil diatoms from Pleistocene sediments of Lake Petén-Itzá, Guatemala, Central America. Phytotaxa, 2018, 351 (4), pp.247-263. ⟨10.11646/phytotaxa.351.4.1⟩. ⟨hal-02013950⟩
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