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Mobergellans (Problematica) from the Cambrian of Greenland, Siberia and Kazakhstan

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Abstract

Mobergellans are disc-shaped problematic fossils of phosphatic composition bearing prominent muscle attachment structures on the presumed internal surface. They are found exclusively in sediments of Early Cambrian age, mainly from Laurentia, Baltica and Siberia. Type material ofDiscinella brastadi Poulsen, 1932 from North-East Greenland is re-studied and synonomised withDiscinella micans (Billings, 1871). Specimens from Siberia described asD. brastadi are re-assigned toMobergella hexactina n. sp., and specimens from Siberia described asMobergella radiolata Bengtson, 1968 are re-assigned toM. sibirica n. sp.Aktugaia triangula Mis-Sarzhevsky, 1976 from Kazakhstan is redescribed, and its relationship to other mobergellans is discussed.

Kurzfassung

Mobergelliden repräsentieren eine problematische Gruppe phosphatschaliger, diskusförmiger Fossilien, die auf der vermutlichen Innenseite markante Muskelabdrücke aufweisen. Mobergelliden sind ausschließlich aus unterkambrischen Sedimenten, vor allem aus Laurentia, Baltica und Sibirien, bekannt. Das Typusmaterial vonDiscinella brastadi Poulsen, 1932 aus Nordost-Grönland wird erneut untersucht und als identisch mitDiscinella micans (Billings, 1871) befunden. Material aus Sibirien, das vorher alsD. brastadi undMobergella radiolata Bengtson, 1968 beschrieben wurde, wird den neuen ArtenMobergella hexactina beziehungsweiseM. sibirica zugeordnet. Die ArtAktugaia triangula Missarzhevsky, 1976 aus Kasachstan wird erneut beschrieben und ihre Beziehung zu anderen Mobergelliden diskutiert.

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  1. Department of Historical Geology and Palaeontology, Institute of Earth Science, Uppsala Universitet, Norbyvägen 22, SE-752 36, Uppsala, Sweden

    Christian B. Skovsted

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Skovsted, C.B. Mobergellans (Problematica) from the Cambrian of Greenland, Siberia and Kazakhstan. Paläontol Z 77, 429–443 (2003). https://doi.org/10.1007/BF03006952

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