ACTA PALAEONTOLOGICA ROMANIAE
Acta Palaeontologica Romaniae, Vol. 20 (2) 2024 - Online Articles 
PRINT ISSN 1842-371x

VITALY DERNOV
BELOPTERA LONGA NAEF, 1922 (CEPHALOPODA: COLEOIDEA) FROM THE LATE EOCENE (PALAEOGENE) OF UKRAINE
Acta Palaeontologica Romaniae, 20 (2), 2024: 3 - 10

available online
11.03.2024

Abstract. Beloptera longa Naef, 1922 and Beloptera aff. longa Naef, 1922 have been described from the Priabonian Mandrykivka Beds of the Rybalsky Quarry Konzentrat-Lagerstate in addition to previously known Beloptera belemnoidea de Blainville, 1825, B. cf. longa Naef, 1922, Belosaepia blainvillei (Deshayes, 1835) and Vasseuria occidentalis Munier-Chalmas, 1880. The geographical and stratigraphic distribution of the species Beloptera longa, which was previously recorded only in the Bartonian of England, has been expanded. Cephalopod assemblages from the Priabonian of Ukrainian consist of the genera Beloptera, Vasseuria, Belosaepia, Aturia and Eutrephoceras.
Keywords: spirulids, Priabonian, Mandrykivka Beds, Ukraine.

FELIX SCHLAGINTWEIT
CHALLENGES IN ORBITOLINID IDENTIFICATION AND BIOSTRATIGRAPHIC CONSEQUENCES: AN APTIAN EXAMPLE
Acta Palaeontologica Romaniae, 20 (2), 2024: 11 - 15

Abstract. The much-cited importance of Orbitolinidae in biostratigraphy depends on the species and time-interval under consideration. In any case, correct species identification is of primary importance as the basis for drawing conclusions. This task is best achieved in an assemblage where centered sections (axial and transverse) showing all details of the complex megalospheric embryo are available. Difficulties in the correct interpretation of oblique sections is exemplified by an example from the Aptian of Turkey, respectively Praeorbitolina versus Mesorbitolina. Resulting differences in species determination not only has an impact on age interpretation, but also associated geologic-tectonic conclusions, as well as basic taxonomic data (e.g., stratigraphic ranges, statistics on stage diversities).
Keywords: Foraminifera, taxonomy, wall structure, embryonic apparatus, Lower Cretaceous.

available online
14.03.2024

Abstract. Babazadeh & Cluzel (2023) studied two stratigraphic sections from the Eocene deposits of the southwest of Shahrekord region (Zagros region, Iran). According to the biostratigraphic ranges of larger benthic foraminifera, the authors suggested in total three assemblage zones assigned to the Ypresian-Bartonian and Bartonian. In a previous contribution, Babazadeh (2022) described three new species of agglutinated conical foraminifera from the Eocene biostratigraphic framework in the Mahallat region of central Iran. It is demonstrated herein that the identified larger benthic foraminifera in both publications need reassessment with respect to taxonomy and biostratigraphic outcomes.
Keywords: Eocene, Larger Benthic Foraminifera, Nummulites, Alveolina, Orbitolinidae, Coskinolinidae.

available online
6.04.2024

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