Rectifenestella nikiforovae (Schulga-Nesterenko, 1936)
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publication ID |
https://doi.org/ 10.4202/app.2008.0078 |
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persistent identifier |
https://treatment.plazi.org/id/03A47E57-7E70-A112-C46A-FAA54D16F9C8 |
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treatment provided by |
Felipe |
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scientific name |
Rectifenestella nikiforovae |
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Rectifenestella nikiforovae View in CoL ( Shul’ga−Nesterenko, 1936)
Figs. 8M, 10D View Fig .
Material examined.—Gipsvika, thin section PMO 170.943, 170.915B.
Description.— Rectifenestella with minute meshwork and narrow branches and dissepiments. There are 20–22 branches per 10 mm across colony and 18–20 dissepiments per 10 mm along colony. Branches 0.24–0.30 mm wide carrying 4–5 nodes (0.05 mm × 0.10 mm) per 1 mm. Distance between node centers 0.18–0.26 mm. Dissepiments 0.12–0.18 mm wide. Fenestrules 0.38–0.44 mm long and 0.18–0.24 mm wide. Apertures circular 0.10–0.12 mm in diameter or slightly oval measuring 0.10 mm × 0.12 mm. There are 18–22 apertures per 5 mm along branch; 2–2.5 bordering each fenestrule. Distance between apertural centers 0.22–0.28 mm along branch. Zooecial chambers fabiform in shallow tangential section; pentagonal in median to deep section.
Measurements.—See Table 9. Stratigraphic and geographic range.—Occurrence on Svalbard: Asselian, middle part of the Tyrrellfjellet Member. Sakmarian–Artinskian of the Russian Platform, Russia ( Morozova and Kruchinina 1986); Lower Permian of China ( Yang and Lu 1983).
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