Morphological Variability of <i>Alveolophora antiqua</i> from a Freshwater Early Miocene Paleolake in the Barguzin Valley (Baikal Rift Zone)
Using scanning electron microscopy, the morphology of <i>Alveolophora antiqua</i> (Moisseeva) Moisseeva from the freshwater Early Miocene paleolake in the Barguzin Valley was studied. We extended the species diagnosis relative to features such as spines, structure of areolae, costae, alv...
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MDPI AG
2022-12-01
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| Online Access: | https://www.mdpi.com/1424-2818/14/12/1075 |
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| author | Marina Usoltseva Lyubov’ Titova Abdulmonem Hassan Sergei Rasskazov Alexey Morozov |
| author_facet | Marina Usoltseva Lyubov’ Titova Abdulmonem Hassan Sergei Rasskazov Alexey Morozov |
| author_sort | Marina Usoltseva |
| collection | DOAJ |
| description | Using scanning electron microscopy, the morphology of <i>Alveolophora antiqua</i> (Moisseeva) Moisseeva from the freshwater Early Miocene paleolake in the Barguzin Valley was studied. We extended the species diagnosis relative to features such as spines, structure of areolae, costae, alveolae, rimoportulae and the external opening of rimoportulae and show a wide morphological variability with regard to valve shape (round, oval, ovoid and triangular). The percentage of these shapes varied with the core depth. Oval valves dominated in lower layers, while triangular ones occur in upper layers. We propose that the shape variability of valves might be due a sharp short-term cooling event or polyploidization. The finding of <i>A. antiqua</i> in the Early Miocene deposits of the Barguzin Valley expands both the georaphic and stratigraphic ranges of this species. |
| first_indexed | 2024-03-09T17:06:28Z |
| format | Article |
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| institution | Directory Open Access Journal |
| issn | 1424-2818 |
| language | English |
| last_indexed | 2024-03-09T17:06:28Z |
| publishDate | 2022-12-01 |
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| record_format | Article |
| series | Diversity |
| spelling | doaj.art-7c00d47e967d42d1985d80e6aec2412b2023-11-24T14:23:09ZengMDPI AGDiversity1424-28182022-12-011412107510.3390/d14121075Morphological Variability of <i>Alveolophora antiqua</i> from a Freshwater Early Miocene Paleolake in the Barguzin Valley (Baikal Rift Zone)Marina Usoltseva0Lyubov’ Titova1Abdulmonem Hassan2Sergei Rasskazov3Alexey Morozov4Limnological Institute of the Siberian Branch of the Russian Academy of Sciences, 3 Ulan-Batorskaya, Irkutsk 664033, RussiaLimnological Institute of the Siberian Branch of the Russian Academy of Sciences, 3 Ulan-Batorskaya, Irkutsk 664033, RussiaInstitute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Sciences, 128 Lermontova, Irkutsk 664033, RussiaInstitute of the Earth’s Crust of the Siberian Branch of the Russian Academy of Sciences, 128 Lermontova, Irkutsk 664033, RussiaLimnological Institute of the Siberian Branch of the Russian Academy of Sciences, 3 Ulan-Batorskaya, Irkutsk 664033, RussiaUsing scanning electron microscopy, the morphology of <i>Alveolophora antiqua</i> (Moisseeva) Moisseeva from the freshwater Early Miocene paleolake in the Barguzin Valley was studied. We extended the species diagnosis relative to features such as spines, structure of areolae, costae, alveolae, rimoportulae and the external opening of rimoportulae and show a wide morphological variability with regard to valve shape (round, oval, ovoid and triangular). The percentage of these shapes varied with the core depth. Oval valves dominated in lower layers, while triangular ones occur in upper layers. We propose that the shape variability of valves might be due a sharp short-term cooling event or polyploidization. The finding of <i>A. antiqua</i> in the Early Miocene deposits of the Barguzin Valley expands both the georaphic and stratigraphic ranges of this species.https://www.mdpi.com/1424-2818/14/12/1075<i>Alveolophora antiqua</i>fossil diatomsMioceneovaltriangular valvesBarguzin Valley |
| spellingShingle | Marina Usoltseva Lyubov’ Titova Abdulmonem Hassan Sergei Rasskazov Alexey Morozov Morphological Variability of <i>Alveolophora antiqua</i> from a Freshwater Early Miocene Paleolake in the Barguzin Valley (Baikal Rift Zone) Diversity <i>Alveolophora antiqua</i> fossil diatoms Miocene oval triangular valves Barguzin Valley |
| title | Morphological Variability of <i>Alveolophora antiqua</i> from a Freshwater Early Miocene Paleolake in the Barguzin Valley (Baikal Rift Zone) |
| title_full | Morphological Variability of <i>Alveolophora antiqua</i> from a Freshwater Early Miocene Paleolake in the Barguzin Valley (Baikal Rift Zone) |
| title_fullStr | Morphological Variability of <i>Alveolophora antiqua</i> from a Freshwater Early Miocene Paleolake in the Barguzin Valley (Baikal Rift Zone) |
| title_full_unstemmed | Morphological Variability of <i>Alveolophora antiqua</i> from a Freshwater Early Miocene Paleolake in the Barguzin Valley (Baikal Rift Zone) |
| title_short | Morphological Variability of <i>Alveolophora antiqua</i> from a Freshwater Early Miocene Paleolake in the Barguzin Valley (Baikal Rift Zone) |
| title_sort | morphological variability of i alveolophora antiqua i from a freshwater early miocene paleolake in the barguzin valley baikal rift zone |
| topic | <i>Alveolophora antiqua</i> fossil diatoms Miocene oval triangular valves Barguzin Valley |
| url | https://www.mdpi.com/1424-2818/14/12/1075 |
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