Obtusoconus cf. mirabilis, Vassiljeva, 1990

Kouchinsky, Artem, Bengtson, Stefan, Landing, Ed, Steiner, Michael, Vendrasco, Michael & Ziegler, Karen, 2017, Terreneuvian stratigraphy and faunas from the Anabar Uplift, Siberia, Acta Palaeontologica Polonica 62 (2), pp. 311-440 : 340

publication ID

https://doi.org/ 10.4202/app.00289.2016

persistent identifier

https://treatment.plazi.org/id/03AD87A8-FF86-6D3A-FFF3-FD5C643C8614

treatment provided by

Felipe

scientific name

Obtusoconus cf. mirabilis
status

 

Obtusoconus cf. mirabilis View in CoL Vasil’eva, 1990

Fig. 13A, C View Fig .

Material.—Two internal moulds, SMNH Mo181971 and 181973, from sample 5a/34.75 (section 96-5a, Fig. 2 View Fig ), Emyaksin Formation (SOM 1), Anabar Uplift, Siberian Platform, Russia. Correlated with Cambrian Stage 2.

Description.—Orthoconic shells with laterally compressed, oval aperture (length/width ratio ca. 2) and a globular, slightly laterally displaced protoconch. The inner shell surface (as replicated on the internal moulds) is smooth.

Remarks.— Type material of Obtusoconus mirabilis Vasil’- eva, 1990 derives from a drillcore from the Pestrotsvet Formation in the Lena-Aldan region, from the Tommotian Stage (Vasil’eva 1990). Specimens described herein differ from Obtusoconus mirabilis Vasil’eva, 1990 in lacking regularly spaced transverse folds, but the difference may be preservational. Obtusoconus sp. ( Fig. 13B, G–I View Fig ) is different from Obtusoconus cf. mirabilis in having a broader aperture, more rapidly expanding shell and a smaller, more dorso-ventrally compressed protoconch.

Kingdom

Animalia

Phylum

Mollusca

Family

Scenellidae

Genus

Obtusoconus

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