The first record of calcareous dinoflagellate cysts from the Upper Cretaceous of the Volga River Region

2016 ◽  
Vol 466 (1) ◽  
pp. 12-15
Author(s):  
V. S. Vishnevskaya
Keyword(s):  
Upper Cretaceous ◽  
First Record ◽  
Dinoflagellate Cysts ◽  
Volga River ◽  
River Region ◽  
Calcareous Dinoflagellate Cysts

scholarly journals Goniocamax christenseni n. sp. (Belemnitellidae, Belemnitida) – a new species from the Upper Cretaceous of Russia

2005 ◽  
Vol 52 ◽  
pp. 159-166
Author(s):  
Martin Košták
Keyword(s):  
New Species ◽  
Upper Cretaceous ◽  
Anterior Part ◽  
Unknown Origin ◽  
Acute Angle ◽  
Volga River ◽  
River Region ◽  
Primitive Species ◽  
A New Species ◽  
Evolutionary Lineages

A new species of Goniocamax Naidin: Goniocamax christenseni n. sp. is described from the Upper Turonian and the lowermost Coniacian strata of the Volga river region in Russia. The new species occur together with ‘primitive’ species of Goniocamax i.e. Goniocamax intermedius (Arkhangelsky) and G. surensis (Naidin), which suggests that two parallel evolutionary lineages in Goniocamax sensu Naidin, 1964 were present and both of unknown origin. The origin of G. lundgreni (Stolley) can be explained by gradual calcification of the anterior part of the guard in the intermedius/surensis group. G. christenseni n. sp. has a well calcified pseudoalveolus and an acute angle at the bottom of the ventral fissure of the wall of the pseudoalveolus. Thus, G. christenseni n. sp. resembles the first representatives of Belemnitella D’Orbigny and is considered the likely ancestor of the Belemnitella group. Phylogeny and palaeobiogeography of the Late Turonian belemnitellids (genera Praeactinocamax Naidin and Goniocamax Naidin) are discussed.

Planktonic foraminifera and dinoflagellate cysts from the Upper Cretaceous Abderaz Formation in the Koppeh-Dagh Basin, NE Iran

Stratigraphy ◽  
2018 ◽  
Vol 15 (1) ◽  
pp. 47-66
Author(s):  
Elham Davtalab ◽  
Mohammad Vahidinia ◽  
Ebrahim Ghasemi-Nejad ◽  
Alireza Ashouri
Keyword(s):  
Upper Cretaceous ◽  
Planktonic Foraminifera ◽  
Dinoflagellate Cysts ◽  
Ne Iran

scholarly journals BROECKINELLA HENSONI N. SP., A NEW LARGER BENTHIC FORAMINIFERA FROM THE UPPER MAASTRICHTIAN OF IRAN AND A REVISION OF THE GENUS BROECKINELLA HENSON, 1948

2020 ◽  
pp. 57-67
Author(s):  
Felix Schlagintweit ◽  
Koorosh Rashidi
Keyword(s):  
Benthic Foraminifera ◽  
Upper Cretaceous ◽  
Test Chamber ◽  
First Record ◽  
Generic Diagnosis ◽  
Larger Benthic Foraminifera ◽  
Zagros Zone ◽  
Sw Iran ◽  
Tarbur Formation ◽  
Upper Maastrichtian

new larger benthic foraminifera is described as Broeckinella hensoni from the upper Maastrichtian Tar-bur Formation of SW Iran (Zagros Zone). In comparison to the type species of the genus, Broeckinella arabica Henson, which also occurs in the Tarbur Formation, the new species has distinctly larger dimensions (e.g., size and thickness of test, chamber height). The first record of a microspheric specimen of B. arabica shows previously unrecorded annular chambers in the final test stage. Therefore, the generic diagnosis is herein emended. In the Tarbur Formation, both B. hensoni n. sp. and B. arabica occur in foraminiferal-algal wackestones. However, B. arabica occurs in a wider range of microfacies, including packstones and grainstones. It is assumed that Broeckinella originated in the Upper Cretaceous with Broeckinella neumannae Gendrot. The upper Albian Broeckinella aragonensis Peybernès is herein transferred to the porcellaneous genus Peneroplis Montfort.

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