Two new species of Ginkgoales from the Middle Jurassic of Mexico

This paper reports two new species of Ginkgoales collected from the Cañada Alejandro and Río Ñumi (Zorrillo and Zorrillo-Taberna Undifferentiated Formations, Middle Jurassic). Thirty-one fossils were selected and compared with 14 species from different localities. A numerical taxonomy analysis was p...

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Bibliographic Details
Published in:Historical biology 2015-04, Vol.27 (3-4), p.366-373
Main Authors: Patricia Velasco-de León, M., Lozano-Carmona, Diego E., Flores Barragan, Miguel A., Daniel Martínez Paniagua, O., Silva Pineda, A.
Format: Article
Language:English
Subjects:
Ginkgoidium
gymnosperms
Middle Jurassic
North America
Sphenobaiera
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Summary:This paper reports two new species of Ginkgoales collected from the Cañada Alejandro and Río Ñumi (Zorrillo and Zorrillo-Taberna Undifferentiated Formations, Middle Jurassic). Thirty-one fossils were selected and compared with 14 species from different localities. A numerical taxonomy analysis was performed through a data matrix formed by 15 characters. Results indicate an important speciation process of the Ginkgoales during the Jurassic in the southeast of Mexico. New evidence suggests the existence of eight species from the Ginkgoidium Yokoyama, 1889 and Sphenobaiera (Florin) Harris and Millington, 1974 genera and two new species Ginkgoidiumnundichii Velasco-de León, Lozano-Carmona, Flores, Martínez and Silva and Sphenobaieramixteca Velasco-de León, Lozano-Carmona, Flores, Martínez and Silva
ISSN:0891-2963
1029-2381
DOI:10.1080/08912963.2013.874423