Chapter 6: TAXONOMY, BIOSTRATIGRAPHY, AND PHYLOGENY OF OLIGOCENE GLOBIGERINA, GLOBIGERINELLA, AND QUILTYELLA N. GEN.
Published:January 31, 2018
Silvia Spezzaferri, Helen K. Coxall, Richard K. Olsson, Christoph Hemleben, 2018. "TAXONOMY, BIOSTRATIGRAPHY, AND PHYLOGENY OF OLIGOCENE GLOBIGERINA, GLOBIGERINELLA, AND QUILTYELLA N. GEN.", Atlas of Oligocene Planktonic Foraminifera, Bridget S. Wade, Richard K. Olsson, Paul N. Pearson, Brian T. Huber, William A. Berggren
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The taxonomy, phylogeny and biostratigraphy of Oligocene Globigerina, Globigerinella and the new genus Quiltyella is reviewed. Globigerina and Globigerinella are long-ranging genera that extend into the modern. Globigerina appeared in the middle Eocene and diversified in the early Oligocene to give rise to several geographically wide-ranging and cosmopolitan species. Globigerinella originated and diversified in the early Oligocene and includes both common cosmopolitan species together with rare clavate and digitate species that were previously referred to the genus Protentella Lipps. Based on new wall textural studies we describe a third related genus, Quiltyella Coxall and Spezzaferri n. gen., which is always rare and highly geographically restricted. This is distinguished from Globigerina and Globigerinella by the higher pore concentration and extreme digitate chamber morphology. The following species are considered as valid: Globigerina archaeobulloides Hemleben and Olsson n. sp., Globigerina bulloides d’Orbigny, Globigerina officinalis Subbotina, Globigerinella clavaticamerata (Jenkins), Globigerinella megaperta Rögl, Globigerinella molinae (Popescu and Brotea), Globigerinella navazuelensis (Molina), Globigerinella obesa (Bolli), Globigerinella praesiphonifera (Blow), Globigerinella roeglina Spezzaferri and Coxall n. sp., and Globigerinella wagneri (Rögl), Quiltyella clavacella (Rögl), and Quiltyella nazcaensis (Quilty).
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Atlas of Oligocene Planktonic Foraminifera
The taxonomy, biostratigraphy, distribution, paleoecology and phylogenetic systematics of Oligocene planktonic foraminifera are treated in an illustrated atlas format. One hundred and twenty-eight species are recognized, including three species of Catapsydrax, eight species of Globorotaloides, two species of Protentelloides, twelve species of Paragloborotalia, two species of Parasubbotina, three species of Globigerina, eight species of Globigerinella, two species of Quiltyella Coxall and Spezzaferri n. gen., four species of Ciperoella Olsson and Hemleben n. gen., fifteen species of Globoturborotalita, seven species of Globigerinoides, seven species of Trilobatus, nine species of Subbotina, sixteen species of Dentoglobigerina, one species of Globoquadrina, two species of Turborotalita, three species of Acarinina, two species of Pseudohastigerina, two species of Turborotalia, two species of Dipsidripella, two species of Globigerinita, four species of Tenuitella, four species of Chiloguembelina, two species of Jenkinsina, two species of Cassigerinella, and four species of Streptochilus.
We name fourteen new species: Chiloguembelina adriatica Premec Fucek, Hernitz Kucenjak and Huber n. sp., Chiloguembelina andreae Premec Fucek, Hernitz Kucenjak and Huber n. sp., Dentoglobigerina eotripartita Pearson, Wade and Olsson n. sp., Globigerina archaeobulloides Hemleben and Olsson n. sp., Globigerinella roeglina Spezzaferri and Coxall n. sp., Globigerinoides neoparawoodi Spezzaferri n. sp., Globigerinoides joli Spezzaferri n. sp., Globoturborotalita eolabiacrassata Spezzaferri and Coxall n. sp., Globoturborotalita paracancellata Olsson and Hemleben n. sp., Globoturborotalita pseudopraebulloides Olsson and Hemleben n. sp., Globorotaloides atlanticus Spezzaferri and Coxall n. sp., Subbotina projecta Olsson, Pearson, and Wade n. sp., Streptochilus tasmanensis Smart and Thomas n. sp. and Trilobatus altospiralis Spezzaferri n. sp. The following new genera are named: Ciperoella Olsson and Hemleben n. gen. and Quiltyella Coxall and Spezzaferri, n. gen.
Over 2000 scanning electron micrographs images, including the type specimens of more than 60 species are illustrated for the first time, providing fresh comprehension of the shell architecture and wall texture, particularly for species that were poorly illustrated when first described. The biostratigraphic occurrences and phylogenetic relationships of all species of Oligocene planktonic foraminifera are reviewed. Analysis of wall textures, based on well-preserved material (much of which is illustrated for the first time) provides the basis for the higher taxonomy. Accordingly, Oligocene normal perforate planktonic foraminifera are divided into the Families Globigerinidae, Truncorotaloididae, and Globanomalinidae. Oligocene microperforate species, are placed in the Families Globigerinitidae, Chiloguembelinidae, Guembelitriidae, and Cassigerinellidae.