Helicosphaera truempyi

Helicosphaera truempyi Biolzi and Perch-Nielsen, 1982

Large helicolith having a Type III (Helicosphaera carteri type) blanket, expanded flange termination and central area with a large central opening spanned by a disjunct traverse bar.

Helicosphaera truempyi differs from Helicosphaera intermedia Martini (1965) and Helicosphaera leesiae da Gama & Varol (2013) by being larger and having a very large central opening. Moreover, it is further distinguished from Helicosphaera intermedia by having a traverse bar instead of an oblique bar.

Biolzi, M. & Perch-Nielsen, K., (1982): Helicosphaera truempyi, a new Early Miocene calcareous nannofossil. - Eclogae Geologicae Helvetiae. 75(1): 171-175.

da Gama, R. O. B. P. & Varol, O., (2013): New Late Oligocene to Miocene Species. - Journal of Nannoplankton Research. 33(1): 1-12.

Martini, E., (1965): Mid-Tertiary calcareous nannoplankton from Pacific deep-sea cores. - Colston Papers. 17: 393-411.