Maria Rose Petrizzo, Isabella Premoli Silva; UPPER CRETACEOUS MERIDIONALLY COSTELLATE HEDBERGELLIDS: THE GENUS MERIDIONALLA VS. THE GENUS COSTELLAGERINA. Journal of Foraminiferal Research ; 30 (4): 306–309. doi: https://doi.org/10.2113/0300306
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The two genera, MeridionallaEl-Nakhal, 1982 and CostellagerinaPetters, El-Nakhal and Cifelli, 1983, both erected to accommodate all the pre-Campanian meridionally costellate species, are discussed after comparison with the holotypes of the type species. Observations clearly indicate that Costellagerina is the appropriate genus, while the genus Meridionalla is inappropriate because its type species, Hedbergella murphyiMarianos and Zingula 1966 does not possess the textural ornamentation diagnostic for the genus.