Aulacoseira capitalina

Name

Aulacoseira capitalina

Rank

Species

Generic Name

[Genus] Aulacoseira

Authors (Name)

Titova L. A. Usoltseva M. V.  

Authors (Pub.)

Titova L. A. Hassan A. I. Usoltseva M. V.  

Publication

Aulacoseira capitalina sp. nov. (Bacillariophyta) from the Middle Miocene sediments of the Barguzin Valley, Baikal Rift Zone (Russia) [2022/11]

Journal

Acta Biologica Sibirica

Volume

8

Page number

573

Year

2022

Fossil Status

valves

Stratigraphy

Miocene

Location

Barguzin valley, core 532 (53°44'28.1"N; 110°11'31.3"E), Republic of Buryatia, Russian Federation

Paleoregion

Eurasia (Siberia)

Data for Holotypus

Repository

Herbarium of Vascular Plants, Central Siberian Botanical Garden, Novosibirsk, Russian Federation

Repository Number

NS0046231

Num

2 D

Pub.

Aulacoseira capitalina sp. nov. (Bacillariophyta) from the Middle Miocene sediments of the Barguzin Valley, Baikal Rift Zone (Russia) [2022/11]

Data for Isotypus

Repository

Limnological Institute, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russian Federation

Repository Number

Slide № 532–94, SEM stubs 14047, 15818, 17547, 17162, 17164

Diagnosis

Valves cylindrical, elliptical valve face 9–18 μm in diameter in the apical axis and 9–16 μm in diameter in the transapical axis, 4.4–15 μm in height. The height/diameter ratio varies within 0.31–0.85. The ratio of diameter to apical and transapical axes is 1–1.3. Mantle striae straight, 8–12 in 10 μm. Each stria comprises a single row of areolae, 8–10 in 10 μm. Linking spines wide spathulate. Separating spines short or elongated pointed with rounded ends. Ringleist deep. Ringleist aperture 3–6.7 μm wide. Rimoportulae (4–8) with straight stalk are embedded in the ringleist. The channels of rimoportulae penetrate through the ringleist and open into the first areola of the row.