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2 2025

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On the ammonite genus Ophryoceras van Hoepen, 1942, a synonym of Pervinquieria (Pervinquieria) Böhm, 1910, from the Upper Albian of KwaZulu-Natal, South Africa

Kennedy William James, Klinger Herbert Christian

Acta Geologica Polonica

2025

Vol. 75, no. 2

art. no. e46

The type, figured and cited material of thirteen species assigned by van Hoepen (1942, 1946) to his genus Ophryoceras, a synonym of Pervinquieria (Pervinquieria) Böhm, 1910, are described and illustrated, and shown to be a single variable Late Albian ammonite species. Pervinquieria salebrosa van Hoepen, 1942 is a further synonym. Van Hoepen (1946) referred a series of fragments to Ophryoceras sp. under four separate entries. We have not seen this material which we refer to as ?Ophryoceras spp. (a)–(d); they may be further synonyms of salebrosa.

Ammonites and inoceramids of the Middle–Upper Albian of Mangyshlak (western Kazakhstan); systematics, biostratigraphy and biogeography

Kennedy William James, Walaszczyk Ireneusz

Acta Geologica Polonica

2025

Vol. 75, no. 1

art. no. e37

Ammonites and inoceramid bivalves are described from an interval spanning the upper Lower to upper Upper Albian at five localities in the Mangyshlak Anticlinorium in central-western Kazakhstan. The stratigraphic record is discontinuous. Ammonites include both endemic and more cosmopolitan taxa, with representatives of the genera Beudanticeras, Cleoniceras, Hoplites, Anahoplites, Semenoviceras, Euhoplites, Dimorphoplites, Epihoplites, Callihoplites, Sulcohoplites, Arrhaphoceras, Placenticeras, Hysteroceras, Pervinquieria, Good-hallites, Idiohamites, and Hamites. The inoceramid bivalves present include representatives of the genera Actinoceramus and Gneisoceramus.