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CADOQUENSTEDTOCERAS – THE NEW MACROCONCH UPPER CALLOVIAN GENUS OF THE CARDIOCERATIDAE (AMMONOIDEA) FAMILY

V. G. Knyazev 1, A. S. Alifirov 2

1 Diamond and Precious Metal Geology Institute SB RAS, Yakutsk, Russia; 2 A.A.Trofimuk Institute of Petroleum Geology and Geophysics SB RAS, Novosibirsk, Russia

The new macroconch genus of ammonites Cadoquenstedtoceras gen. nov. has been established from the Upper Callovian of Siberia. It is characterized by the quenstedtoceratoid stage at the middle whorles of the shell and cadoceratoid one at later stages of ontogenesis.

Keywords: ammonites, Cardioceratidae, Callovian, north of Siberia.

DOI 10.20403/2078-0575-2022-2-3-9

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