Aptian – Albian Ptychoceratidae of southern Patagonia and James Ross Island, Antarctica are described. They are represented by Ptychoceras adpressum (J. Sowerby, 1814), P. forbesianum Stoliczka, 1865 and P. hamaimense Pervinquière 1907. P. hamaimense
occurs in the Peltocrioceras deeckei Assemblage Zone (Upper Aptian) of Patagonia and the Pictetia Assemblage Zone (Lower Albian) of Antarctica. P. adpressum has been recorded from the Upper Albian Puzosia vegaensis Assemblage Zone of Patagonia and Tetragonites
Assemblage Zone of Antarctica. P. forbesianum occurs in the Middle–Late Albian of Antarctica.
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