Reappraisal of the ammonoid genus Lytohoplites Spath, 1925 in west-central Argentina: variability and updated stratigraphic occurrence

VENNARI, V.V.

San Luis Potosí

Congreso; 10th International Congress on the Jurassic System; 2018

Universidad Nacional Autónoma de México

Spath (1925) erected the genus Lytohoplites and designated L. burckhardti (Mayer-Eymar in Burckhardt, 1900) from the Neuquén Basin, Argentina, as its type species. However, up to date, L. burckhardti was poorly known as neither well preserved nor complete specimens were illustrated. Although a Neocomian age was originally envisaged for this genus (Burckhardt, 1900; Gerth, 1925), it was later on included in the Andean upper Tithonian Corongoceras alternans Assemblage Zone (Microcanthum to Durangites Zones) by Leanza (1945). Therefore, the aim of the present contribution is threefold: to present new specimens of Lytohoplites from the Neuquén Basin, to analyze the spectrum of morphological variability of L. burckhardti and to specify the genus stratigraphic occurrence in Argentina.