Revision of species of the ammonite genus Pseudosubplanites from the Berriasian of the Crimean mountains

The Berriasian–Valanginian (Early Cretaceous) boundary transition at Santa Catarina Ticuá, Oaxaca state, southern Mexico: Ammonites, bivalves, calpionellids and their paleobiogeographic significance

“…2, figs. 1a, b, 2a, b) from the upper Berriasian of France differs by smaller size and wider spaced ribs (see Bogdanova and Arkadiev, 2005). Hegaratella baezi Cantú-Chapa (2012, p. 57, pl.…”

“…Subthurmannia boissieri Zone of Ukraine, Bulgaria and France, as summarized by Bogdanova and Arkadiev (2005).…”

“…jauberti. P. jauberti was previously described from the late Berriasian Subthurmannia boissieri Zone of Europe (Bogdanova and Arkadiev, 2005). ?Sarasinella is present in the upper Berriasian…”

The northernmost occurrence of the Lower Berriasian ammonite Pseudosubplanites grandis (Štramberk Limestone, Outer Western Carpathians, Czech Republic)

“…Bogdanova & Arkadiev (2005) and also Arkadiev & Bogdanova (2012). Arkadiev (2003a) recalled that Nikolov & Sapunov (1977) had determined a new subgenus Hegaratella in the framework of the genus Pseudosubplanites; the subgenus is supposed to be distinguished from the type subgenus by the absence of polygyrate ribs and by the indistinct ventral furrow.…”

“…In order to get the full picture we state that Tavera Benitez (1985) classified Pseudosubplanites and Hegaratella as subgenera of the genus Berriasella Uhlig, 1905. In additon, Bogdanova & Arkadiev (2005) originally regarded Hegaratella as a subgenus of Berriasella.…”