Helicosphaera mediterranea

Helicosphaera mediterranea Muller, 1981

Helicosphaera transylvanica Gheta, 1981

Helicolith having a Type III (Helicosphaera carteri type), an expanding flange termination and a central area with a large central opening spanned by a conjunct traverse bar which has a split parallel to the long axis.

Helicosphaera mediterranea differs from Helicosphaera crouchii Bukry (1981) by having a Type III (Helicosphaera carteri type) blanket instead of Type I (Helicosphaera ampliaperta type) blanket.

Bukry, D., (1981): Pacific coast coccolith stratigraphy between Point Conception and Cabo Orientes, Deep Sea Drilling Project Leg 63. - Initial Reports of the Deep Sea Drilling Project. 63: 445-471.

Gheta, N., (1981): A new species of the calcareous nannofossil genus Helicosphaera, Kamptner. - Dari de Seama ale Sedintelor Institutul de Geologie si Geofizica. 68(3): 1-4.

Müller, C., (1981): Beschreibung neuer Helicosphaera-Arten aus dem Miozän und Revision biostratigraphischer Reichweiten einiger neogener Nannoplankton-Arten. - Senckenbergiana Lethaea. 61: 427-435.