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Wyświetlanie 1-2 z 2
Tytuł:
Two medium-sized deinotheres (Proboscidea: Mammalia) from the Miocene rocks of the Eastern Carpathians Foreland (Romania)
Autorzy:
Ţibuleac, P.
Powiązania:
https://bibliotekanauki.pl/articles/2060448.pdf
Data publikacji:
2018
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
hemimandible
molars
tibia
Drăgeşti
Deleni
Bessarabian
Opis:
The paper summarizes the medium-sized deinothere records from Romania, improving the palaeontological data of two less-known specimens from the Eastern Carpathians Foreland. The area is famous primarily by the large deinothere of Găicena and Mânzaţi assigned to the “Deinotherium gigantissimum”. Later, several fossils of Deinotherium were documented, but they remained generally unknown, and the morphological and biometrical data were not engaged in the further deinothere comparisons. The most important specimen is a fragmentary right hemimandible with well-fossili zed m1-m2, housed in the “Ion Borcea” Natural History Museum of Bacău. The p3-p4 and m3 preserved only the roots; even there are not obvious reworking signs. Furthermore, a tibia sin. fragment were firstly added. The fossil remains were unearthed from the Late Bessarabian rocks (MN 9) near Drăgeşti (Bacău County). The second specimen represents an isolated M2 sin of Deinotherium giganteum stored at the Museum of Paleontology “Alexandru Ioan Cuza” University of laşi. It was collected from a microconglomerate bed (Early Bessarabian, ?MN 7-8-Mn 9) cropping out in the Pietrăria Hill Quarry (Deleni, laşi County). The age of fossil-bearing layers was accurately documented by several mollusc assemblages.
Źródło:
Geological Quarterly; 2018, 62, 3; 669--684
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new polyphysacean alga from the Miocene of Romania and its biomineralization
Autorzy:
Barattolo, F.
Ionesi, V.
Ţibuleac, P.
Powiązania:
https://bibliotekanauki.pl/articles/23214.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Paleobiologii PAN
Opis:
Polyphysacean algal fertile caps from the Sarmatian near Suceava (NE Romania) are here described as a new species, Acetabularia moldavica, ascribed to the extant genus Acetabularia due to the presence of both inferior and superior coronae. Gametangia are preserved and closely packed within the gametophore. The gametangium wall is strongly mineralized and SEM observations show acicular aragonite crystals arranged perpendicularly to the wall surface. The occurrence of mineralized cyst walls distinguishes the new species from the other three species ascribed to the genus Acetabularia, namely Acetabularia miocaenica, Acetabularia chiavonica, and Acetabularia transylvana. Cyst wall biomineralization in A. moldavica sp. nov., Chalmasia, and Halicoryne appears to assist in distinguishing taxa at species level but not at genus level. Four types of intracellular biomineralization can be recognized in polyphysaceans according to the mineralization of cyst walls and intergametangial spaces. The attribution of an extant species to a fossil genus and vice-versa can be problematic when the fossil consists of a mineralized spicule (intracellular biomineralization). Two contrasting examples are Acetabularia schenckii (extant species) assigned to the genus Acicularia (fossil), and Halicoryne morelleti (fossil species) referred to an extant genus (Halicoryne). When it is unclear whether fossil taxa possessed one or two coronae, the attribution of Cenozoic species to an extant genus appears speculative. Therefore, we support the view that the genus Acicularia should only be applied to fossil species. In addition, mineralized aggregates of cysts of Halicoryne morelleti should be distinguished from their possible extant counterparts (Chalmasia, Halicoryne, and Acetabularia) when coronal structures are not preserved. In the literature Halicoryne morelleti has been compared with the fossil genera Sedalanella and Ioanella. The first genus must be considered a junior synonym of Oroseina. A new interpretation of the genus Ioanella is supplied. The two layers of cysts of Ioanella conform poorly with the small ellipsoidal calcareous bodies of Halicoryne morelleti. Therefore, we propose the new genus Patruliuspora for Halicoryne morelleti.
Źródło:
Acta Palaeontologica Polonica; 2019, 64, 1
0567-7920
Pojawia się w:
Acta Palaeontologica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
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