The type species Placenticeras warthi Kossmat, 1895 described from the Early Cretaceous (Albian) of South India is crucial for understanding the true affinity of the genus Hypengonoceras Spath, 1922. The species description was based on a holotype and was influenced by the erroneous and misleading hand sketches of the species published in the literature. We recently inspected the type specimen archived in Geological Survey of India, Kolkata, along with one additional specimen kept in Indian Museum, Kolkata, and redescribe them in the present study.

中文翻译：

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关于 Placenticeras warthi Kossmat 的注释，1895 年（Ammonoidea），Hypengonoceras Spath 属的模式种，1922 年

类型种胎盘Kossmat，1895 年描述于南印度早白垩纪（阿尔比），对于了解该属的真正亲和力至关重要龙眼Spath，1922 年。物种描述基于正模标本，并受到文献中发表的物种错误和误导性手绘草图的影响。我们最近检查了在加尔各答印度地质调查局存档的模式标本，以及保存在加尔各答印度博物馆的另外一个标本，并在本研究中重新描述了它们。