Helicosphaera inversa

Helicopontosphaera inversa Gartner, 1977, Invalid ICN Art. 40

Helicosphaera inversa (Gartner, 1977) Haq & Berggren, 1978, Invalid ICN Art. 35.1

Helicopontosphaera inversa Gartner, 1977 ex Gartner, 1979, Invalid ICN Art. 35.1

Helicopontosphaera inversa Gartner, 1977 ex Gartner, 1980, Invalid ICN Art. 35.1

Helicosphaera inversa (Gartner, 1977 ex Gartner, 1980) Theodoridis, 1984, Invalid ICN Art. 35.1

Parallel sided helicolith having a Type III (Helicosphaera carteri type) blanket, an expanded flange termination and a central area with a moderate size central opening spanned by a conjunct often inverse bar.

Helicosphaera inversa differs from Helicosphaera sellii (Bukry and Bramlette, 1969) Jafar and Martini, 1975 and Helicosphaera carteri (Wallich, 1877) Kamptner, 1954 by being parallel sides and having an inverse bar.

Bukry, D. & Bramlette, M. N., (1969): Some new and stratigraphically useful calcareous nannofossils of the Cenozoic. - Tulane Studies in Geology. 7: 131-142.

Jafar, S. A. & Martini, E., (1975): On the validity of the calcareous nannoplankton genus Helicosphaera. - Senckenbergiana Lethaea. 56: 381-397.

Gartner, S., (1979): Validation of Helicopontosphaera inversa. - INA Newsletter. 1(1): 2-2.

Gartner, S. (1980). Validation of Helicopontosphaera inversa. INA Newsletter. 2: 35-35.

Kamptner, E., (1954): Untersuchungen über den Feinbau der Coccolithen. Anzeiger. - Österreichische Akademie der Wissenschaften. Mathematische-Naturwissenschafliche Klasse. Wien. 87: 152-158.

Wallich, G. C., (1877): Observations on the coccosphere. - Annals and Magazine of Natural History. 19: 342-350.