Discoaster premicros

Discoaster premicros de Kaenel & Bergen in de Kaenel et al. 2017

2008 Discoaster cf. D. lidzi Denne, p. 238, pl. 1, fig. 4

Emended Description: Six segmented discoasters have short, robust arms with a wide bifurcation. The inter-arm area is narrow and V-shaped. Wide proximal ridges decorate the gently bulged proximal side, whilst the distal side is smooth without any decoration.

Discoaster premicros differs from Discoaster leios by having gently bulged proximal side and V-shape inter-arm areas, whereas the latter has a strongly bulged proximal side and rounded inter-arm areas.

De Kaenel, E., Bergen, J. A., Browning, E., Blair, S. A. & Boesiger, T.M. 2017. Uppermost Oligocene to Middle Miocene Discoaster and Catinaster taxonomy and stratigraphy in the circum North Atlantic Basin, Gulf of Mexico and ODP Leg 154. Journal of Nannoplankton Research, 37 (2-3): 215–244.

Denne, R. A., 2008. Utilizing abundance changes of new and non-standard calcareous nannofossil taxa to increase biostratigraphic resolution in expanded continental margin deposits: Examples from the Middle and Lower Miocene of the Gulf of Mexico. Transactions of the Gulf-Coast Association of Geological Societies 58, 227-239.

Varol, O. 1984. New Neogene calcareous nannofossil taxa from Malta and southern Turkey. Neues Jahrbuch für Geologie und Paläontologie, Monatshefte, 6: 375–384.