Aldanella attleborensis (Shaler and Foerste, 1888)
publication ID |
https://doi.org/ 10.4202/app.00289.2016 |
persistent identifier |
https://treatment.plazi.org/id/03AD87A8-FFBF-6D0F-FCCF-FA6667A18393 |
treatment provided by |
Felipe |
scientific name |
Aldanella attleborensis (Shaler and Foerste, 1888) |
status |
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Aldanella attleborensis (Shaler and Foerste, 1888) View in CoL
Figs. 20–22.
Material.—Over 1000 phosphatic internal moulds, including figured SMNH Mo160428, 182260–182272, from samples 1/46, 1/45, 1/29.5 (section 1, Fig. 4 View Fig ), and K2/20, K2/21, K2/22, K2/23, K2/24, K2/26, 3/10, 3/12, 3/12.2, 3/12.5 (section 3, Fig. 3), and 5/10, 5/10B, 5a/1, 5a/1.2, 5a/5, 5a/6, 5a/9 (sections 96-5 and 96-5a, Fig. 2 View Fig ), Medvezhya and Emyaksin formations, Anabar Uplift, Siberian Platform, Russia. Correlated with uppermost Fortunian Stage and lower part of Cambrian Stage 2.
Description.—Moderately expanding shells, up to 2.0 mm in diameter, consist of up to 2.5 whorls. Spire slightly protrudes above the surface of the last whorl. Lateral surface of the whorl is broadly rounded and passes gradually into flattened or slightly convex adapical and slightly concave umbilical surfaces of the whorl. Aperture irregularly elliptical in outline, width/height ratio 1.6–1.8. Ornamentation of the shell exterior (judging from the surface of external mould; Fig. 22A View Fig ) is represented by transverse growth lines. Protoconch with a diameter of 90–120 μm, not clearly separated in the available internal and external moulds (Figs. 20–22). Apex of internal moulds sometimes with polygonal to rounded impressions 20–40 μm in diameter (Figs. 20A 3, F 1, 21F; see also Kouchinsky 2000a, Ushatinskaya and Parkhaev 2005, Isakar and Peel 2007).
Remarks.—The specimens previously assigned to A. crassa by Kouchinsky (2000a: figs. 13A, B, L– R) are referred herein to A. attleborensis , following Parkhaev and Karlova (2011: 1187). Those authors also synonymized A. kunda (Öpik, 1926) ; A. rozanovi Missarzhevsky in Rozanov and Missarzhevsky, 1966 [in part]); A. yanjiahensis Chen, 1984 ; A. costata Missarzhevsky, 1989 ; and A. patelliforma Bokova, 1990 , with A. attleborensis (see discussion above and more inclusive synonymy in Landing 1988; Landing et al. 1989, 2013).
Stratigraphic and geographic range.— Uppermost Fortunian and Cambrian Stage 2 of Siberia, Avalonia, North and South China, and Baltica.
SMNH |
Department of Paleozoology, Swedish Museum of Natural History |
R |
Departamento de Geologia, Universidad de Chile |
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