Ellipsagelosphaera supergestus

Ellipsagelosphaera supergesta Varol & Bowman, 2019

1996 Ellipsagelosphaera britannica (Stradner 1963) Reinhardt 1964. – Gale et al., fig. 6n.

1999 Ellipsagelosphaera britannica (Stradner, 1963) Reinhardt, 1964 – Aguirre-Urreta et al., fig. 4.4.

2003 Watznaueria communis Reinhardt 1964 – Kessels et al.; fig. 4.9–10

2009 Ellipsagelosphaera britannica morphotype E (Stradner 1963) Reinhardt 1964. – Giraud et al., fig. 4.18.

2010 Ellipsagelosphaera britannica (Stradner 1963) Reinhardt 1964. – Tiraboshi & Erba, fig. 5.1; non fig. 5.3.

Ellipsagelosphaera supergesta is distinguished from Ellipsagelosphaera clausa by being smaller than 10.0μm with first-order white birefringence colour rather than first-order yellow birefringence color of E. clausa. It is distinguished from Ellipsagelosphaera britannica (Stradner 1963) Perch-Nielsen 1968 and Ellipsagelosphaera lucasi (Noël 1965) by having a very narrow central area entirely blocked by a traverse bar, whereas the latter species has an open central area on either side of the traverse bar. The abundance pattern of Ellipsagelosphaera supergesta differs from that of Ellipsagelosphaera britannica and Ellipsagelosphaera lucasi.

Aguirre-Urreta, M.B., Concheyro, A., Lorenzo, M., Ottone, E.G. & Rawson, P.F., (1999): Advances in the biostratigraphy of the Agrio Formation (Lower Cretaceous) of the Neuque’n Basin, Argentina: ammonites, palynomorphs, and calcareous nannofossils. – Palaeogeogr. Palaeoclimatol. Palaeoecol., 150: 33–47.

Gale, A.S., Kennedy, W.J., Burnett, J.A., Caron, M. & Kidd, B.E., (1996): The Late Albian to Early Cenomanian succession at Mont Risou, near Rosans (Drôme, SE France): an integrated study (ammonites, inoceramids, planktonic foraminifera, nannofossils, oxygen and carbon isotopes). – Cretac. Res., 17: 515–606.

Kessels, K., Mutterlose, J. & Ruffell, A., (2003): Calcareous nannofossils from late Jurassic sediments of the Volga Basin (Russian Platform): evidence for productivity-controlled black shale deposition. – Int. J. Earth Sci., 92: 743–757.

Reinhardt, P., (1964): Einige Kalkflagellaten-Gattungen (Coccolithophoriden, Coccolithineen) aus dem Mesozoikum Deutschlands. – Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin, 6: 749–759.

Stradner, H., (1963): New contributions to Mesozoic stratigraphy by means of nannofossils. – Proceedings of the Sixth World Petroleum Congress, 1 (4): 167–183.

Tiraboschi, D. & Erba, E., (2010): Calcareous nannofossil biostratigraphy (Upper Bajocian–Lower Bathonian) of the Ravin du Bès section (Bas Auran, Subalpine Basin, SE France): Evolutionary trends of Watznaueria barnesiae and new findings of “Rucinolithus” morphotypes. – Geobios, 43: 59–76.

Varol, O. & Bowman, A.R., (2019): Taxonomic revision of selected Late Jurassic (Tithonian) calcareous nannofossils and the application of mobile mounting - N. Jb. Geol. Paläont. Abh. 291/1(2019):1–23