Aulacoseira capitalina sp. nov. (Bacillariophyta) from the Middle Miocene sediments of the Barguzin Valley, Baikal Rift Zone (Russia)

Using light and scanning electron microscopy, a new species Aulacoseira capitalina Titova et Usoltseva from the Middle Miocene deposits of the Barguzin Valley is described. It is shown that the new species is similar to other elliptical species in terms of elliptical valve face profile, diameter, de...

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Bibliographic Details
Main Authors: Lybov’ А. Titova, Abdulmonem I. Hassan, Marina V. Usoltseva
Format: Article in Journal/Newspaper
Language:English
Published: Altai State University 2022
Subjects:
aulacoseira capitalina
elliptical valves
fossil diatoms
middle miocene
Biology (General)
QH301-705.5
Titova
Sibirica
Online Access:https://doi.org/10.5281/zenodo.7726461
https://doaj.org/article/8a8c6265001345da810971d3ce789c7e
Description
Summary:Using light and scanning electron microscopy, a new species Aulacoseira capitalina Titova et Usoltseva from the Middle Miocene deposits of the Barguzin Valley is described. It is shown that the new species is similar to other elliptical species in terms of elliptical valve face profile, diameter, deep ringleist, but differs in the shape of separating spines, the absence of ridge structure and the shape of rimoportulae. The finding of A. capitalina in the Middle Miocene deposits of the Barguzin Valley expands the range of distribution of elliptical species.

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