Conotheca circumflexa Missarzhevsky

Kouchinsky, Artem, Bengtson, Stefan, Clausen, Sébastien & Vendrasco, Michael J., 2015, An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia, Acta Palaeontologica Polonica 60 (2), pp. 421-512 : 445

publication ID

https://doi.org/ 10.4202/app.2012.0004

persistent identifier

https://treatment.plazi.org/id/03C3891D-1534-C26A-FCC9-FF3BCBABFD44

treatment provided by

Felipe

scientific name

Conotheca circumflexa Missarzhevsky
status

 

Conotheca circumflexa Missarzhevsky in Rozanov et al., 1969

Fig. 27F View Fig .

Material.—One phosphatised conch, SMNH X 4629, from sample 7/55; Emyaksin Formation, Bol’shaya Kuonamka Riv- er; correlated with the Judomia Zone , upper Atdabanian Stage.

Description.—Conch helically curved about a half revolution clockwise towards the direction of growth. The aperture is straight and rounded, slightly oval. The surface of conch is covered with straight, faint, transverse lines. The apical angle is ca. 20°. Wall microstructure is similar to that of other hyoliths (see also Kouchinsky et al. 2009: fig. 45).

Stratigraphic and geographic range.—Lower Cambrian, Atdabanian Stage, Siberian Platform.

Kingdom

Animalia

Phylum

Mollusca

Family

Coleolidae

Genus

Conotheca

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