Abstract

ZELL, Patrick; STINNESBECK, Wolfgang  and  BECKMANN, Seija. Late Jurassic aptychi from the La Caja Formation of northeastern Mexico. Bol. Soc. Geol. Mex [online]. 2016, vol.68, n.3, pp.515-536. ISSN 1405-3322.

Five taxa of Kimmeridgian to Tithonian (Upper Jurassic) aptychi are here described from the La Caja Formation of northeastern Mexico. Laevaptychus (Latuslaevaptychus) latus meyrati Trauth, 1931, L. (Hoplisuslaevaptychus) mexicanus (Castillo and Aguilera, 1895), L. (Autharislaevaptychus) favrei Trauth, 1931, Lamellaptychus lamellosus (Parkinson, 1811) and Lam. murocostatus Trauth, 1929 were previously known from the Tethyan Realm. In northeastern Mexico, records of Lamellaptychus are restricted to the upper lower Kimmeridgian-lower upper Tithonian, while Laevaptychusis presently restricted to the uppermost Kimmeridgian-uppermost Tithonian.

Keywords : Ammonites; aptychi; Late Jurassic; northeastern Mexico.

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