Algomella sp.
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publication ID |
https://doi.org/ 10.4202/app.00289.2016 |
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persistent identifier |
https://treatment.plazi.org/id/03AD87A8-FFA7-6D1B-FF06-FA32632A8166 |
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treatment provided by |
Felipe |
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scientific name |
Algomella sp. |
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Fig. 38F, G View Fig .
Material.—Two internal moulds SMNH Mo182364 and 182365, from sample 3/12.2 (section 3, Fig. 3), Medvezhya Formation, western Anabar Uplift, Siberian Platform, Russia. Correlated with Fortunian–Cambrian Stage 2 transitional beds.
Description.—The moulds are bilaterally symmetrical, cone-shaped, with very broad, irregularly oval aperture. Apex blunt, not clearly separated from the rest of the shell, slightly displaced towards one side of the aperture. Subapical side long, with a broad, shallow median fold covered with faint polygons. The surface of the mould ( Fig. 38G View Fig ) is covered with scattered tubercules.
Remarks.—The fossils are generally similar to Algomella spp. (see Val’kov and Karlova 1984: 27 – 30, pl. 4: 1 – 3), which lack, however, a recognizable tuberculate ornamentation. Internal moulds of Tannuella taishirica Zhegallo in Esakova and Zhegallo, 1996 from western Mongolia are different in being smooth and lack the subapical fold.
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