Aldanella golubevi Parkhaev, 2007
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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-FFBF-6D03-FCCF-FDE163EB86BE |
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treatment provided by |
Felipe |
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scientific name |
Aldanella golubevi Parkhaev, 2007 |
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Aldanella golubevi Parkhaev, 2007 View in CoL
Fig. 19 View Fig .
Material.—Seven phosphatic internal moulds, including figured SMNH Mo182253–182258, from sample 3/10 (section 3, Fig. 3), Medvezhya Formation. Correlated with the uppermost Fortunian Stage.
Description.—Sinistrally coiled shell, up to 1.8 mm in diameter, consists of up to 1.5 rapidly expanding whorls. Adapical surface flattened. Apertural cross-section elongate, irregularly elliptical or ovoid, with width/height ratio ca. 2.0. Inner shell surface (as replicated on internal moulds) with smooth, broad, transverse folds.
Remarks.—Co-occurs with dextral but otherwise similar Aldanella crassa in one sample as well as at the type locality designated by Parkhaev (2007b). There are, however, several samples from the Medvezhya Formation below and above that level that are also mentioned by Parkhaev (2007b), where A. crassa occurs without A. golubevi (see SOM 1). These occurrence data suggest that A. golubevi is a separate species with a fixed sinistral coiling and doubtful affinity to dextrally coiled Aldanella , although Landing et al. (2013) regarded it as an uncommon sinistral variant of A. attleborensis . Jacquet et al. (2016) described Aldanella cf. golubevi from a horizon within the lower part of Cambrian Stage 2 of Australia.
Stratigraphic and geographic range.— Fortunian–Cambrian Stage 2 transitional beds, Siberian Platform and Australia.
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