Khairkhania cf. rotata Missarzhevsky, 1981
publication ID |
https://doi.org/ 10.4202/app.00289.2016 |
persistent identifier |
https://treatment.plazi.org/id/03AD87A8-FFB1-6D0B-FCCF-FA0B640D8214 |
treatment provided by |
Felipe |
scientific name |
Khairkhania cf. rotata Missarzhevsky, 1981 |
status |
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Khairkhania cf. rotata Missarzhevsky, 1981 View in CoL
Fig. 25D View Fig .
Material.—Single phosphatized internal mould SMNH Mo182294 and seven fragments of internal moulds of presumably the same species from sample 3/0 (section 3, Fig. 3), basal Medvezhya Formation (see SOM 1), western Anabar Uplift, Siberian Platform, Russia. Correlated with upper Fortunian Stage.
Description.—Planispiral shell, relatively tightly coiled through ca. 1 revolution, with blunt rounded apex and indistinctly separated protoconch. Cross-section broadly oval.
Remarks.— Khairkhania rotata from western Mongolia and forms of this species described by Parkhaev (2006, 2007b, 2008) from the northwestern flanks of the Anabar Uplift are generally similar but smaller (ca. 75% in size) than the material illustrated herein as Khairkhania cf. rotata ( Fig. View Fig
25D). Khairkhania sp. from the same sample are either fragmentary or open coiled with up to 1/2 revolution ( Fig. 25E, F View Fig ). They may represent a different species, morphological variants, or younger growth stages of the same species. Khairkhania cf. evoluta (see below) is represented by high, cyrtoconic, relatively more laterally compressed internal moulds with smaller protoconchs.
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