Pollen Morphology Of The Momipites Group (Juglandaceae) Recovered In Cenozoic Basins From Central Mexico And Baja California Sur

In the present work, pollen morphology of five triporate Momipites species recovered from the Pie de Vaca Formation (Upper Eocene – Lower Oligocene), the Cuayuca Formation (Upper Eocene – Lower Oligocene), and the TehuacanFormation (Middle Miocene) from Puebla State, as well as the San Gregorio Formation (Upper Oligocene – Lower Miocene) from Baja California Sur are presented. Additionally, diversity and abundance of Momipites in the palynological assemblages are analyzed. Morphological descriptions are based on optic microscopy with phase contrast. Only Momipites coryloides and Momipites microcoryphaeus scanning electron microscopy photographs are shown; they provide detailed evidence of the supratectal spinules. Some taxa of the Momipites group are related to modern Engelhardia, Alfaroa and Oreomunnea genus (Juglandaceae) that live in cloud forests on Mexican and Central American highlands, under humid conditions.