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Sexual dimorphism of cretaceous gastropods of soviet central asia ussr

Sexual dimorphism of cretaceous gastropods of soviet central asia ussr

Paleontologicheskii Zhurnal (3): 29-32

Nerineoptyxis amudariaensis and N. aralensis were found in the Kyzyl Kum and Hissar mountains. In the latter area they were confined to the Shirabad suite which dated them as Late Albian and were usually found together. During an examination of 104 well preserved specimens the shells were divided into 2 discrete groups according to the measurements of apical and pleural angles. A similarity was noted in the early stages of development of the shells. A dimorphism was distinct only in adult forms. Based on collected data the 2 groups represented dimorphic pairs of the same species N. amudariaensis. Sexual dimorphism was determined for the Cretaceous species Echinobathra dimorpha from the Upper Turonian? found in Tuprakkala, Uzbek SSR. The necessity of working with a sufficiently large quantity of material was stressed, as insufficiency of material could lead to separate sexual groups being erroneously interpreted as separate species.

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Accession: 006408525

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