Journal
MICROPALEONTOLOGY
Volume 67, Issue 1, Pages 19-29Publisher
MICRO PRESS
DOI: 10.47894/mpal.67.1.03
Keywords
Foraminifera; Systematics; Palaeobiogeoraphy; Upper Cretaceous; Cenomanian; Iran
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Moncharmontia apenninca is a commonly reported organism in the Upper Cretaceous Neotethyan realm, with possible differences in distribution related to latitudinal variations.
Moncharmontia apenninca (De Castro 1966) is widely reported in the Upper Cretaceous (Turonian-Campanian) shallow-water successions of the Neotethyan realm (e.g., Italy, Croatia). With its First Appearance Datum (FAD) in the lowermost Turonian, it is considered a newcomer taxon in the aftermath of the Cenomanian/Turonian boundary (CTB) extinction event, and therefore a member of the Upper Cretaceous Global Community Maturation Cycle. Its common presence in the middle-pro parte upper Cenomanian Sarvak Formation and time-equivalent strata in Mexico (Valles-San Luis Potosi Platform) document that it represents a CTB extinction survivor taxon like Dicyclina, Nezzazata, Reticulinella and several others. The different local FAD's of Moncharmontia might possibly be linked to latitudinal differences, i.e., an earlier evolution of the species in the near-equatorial area (Mexico, Iran) compared to the low-middle latitudinal occurrences in the peri-Mediterranean realm (e.g., Italy, Turkey).
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