Proptychitina, Zakharov & Abnavi, 2013

Zakharov, Yuri D. & Abnavi, Nasrin Moussavi, 2013, The ammonoid recovery after the end-Permian mass extinction: Evidence from the Iran-Transcaucasia area, Siberia, Primorye, and Kazakhstan, Acta Palaeontologica Polonica 58 (1), pp. 127-147 : 138

Suborder Proptychitina nov.

Diagnosis.— Large involute to semi−evolute discocones, with rounded venter and deep umbilicus, without any tendency of having prominent umbilical shoulders. Surface, marked by radial folds and growth lines, rather with fine spiral lirae mainly in venter. Suture line ceratitic like in ancestral Otoceratina, but more advanced, with denticulated branches of the ventral lobe. The type of early lobe ontogeny like in Otoceratina: VL: ID – ( V 1 V 1 ) LU 1 : ID – ( V 1 V 1 ) LU 1 U 2: I(D 1 D 1).

Remarks.—Differs from the Otoceratina Shevyrev and Ermakova, 1979 by lack of prominent umbilical shoulders and more advanced septal necks (amphichoanitic to prochoanitic within whorls 3 and 4, but not retrochoanitic). A single superfamily Proptychitoidea Waagen, 1895 (families: Proptychitidae Waagen, 1895 , Arctoceratidae Arthaber, 1911 , and Clypeoceratidae Waterhouse, 1996a ). Lower Triassic (Induan– Olenekian).