Taimyria triassica NAUGOLNYKH et MOGUTCHEVA 2022, sp. nov.

• Main Authors: Naugolnykh, Serge V., Mogutcheva, Nina K.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2022
• Subjects: Biodiversity; Taxonomy; Plantae; Peltaspermales; Angaropeltaceae; Taimyria; Taimyria triassica; Taimyr; Siberia
• Online Access: https://zenodo.org/record/7541197; https://doi.org/10.5281/zenodo.7541197

Taimyria triassica NAUGOLNYKH et MOGUTCHEVA sp. nov. Text-figs 2–11 H o l o t y p e. 4287/6, holotype figured here in Textfigs 2a, 3–10. P l a n t F o s s i l N a m e s R e g i s t r y N u m b e r. PFN003027. R e p o s i t o r y. Monographic Department of the State Darwin Museum, Moscow, Russia. During the study, the collection was kept in the Geological Institute of Russian Academy of Sciences (Moscow, Russia). D e r i v a t i o n o m i n i s. From Triassic period. Ty p e l o c a l i t y. The Tsvetkov Cape locality, Taimyr, Siberia, Russia; Lower Triassic, Induan. D i a g n o s i s. Same as for the genus. D e s c r i p t i o n. Macromorphology. The specimen studied is represented by four megastrobili (marked by arrows on Text-fig. 2) preserved on one bedding surface. There is a thick axis on one side of the specimen (Ax in Text-fig. 2). The four megastrobili are located on both lateral side of the Ax axis, with two on each side. Therefore, one can suppose that the megastrobili were arranged on a fertile branch in pinnate order, or forming a pinnate frond-like structure. Two megastrobili are preserved almost completely. Since the actual attachment of the megastrobili to the same branch (Ax) is not clearly visible, only one of the strobili is selected as a holotype (Text-fig. 2a). Two other strobili preserved on the other side of the branch are not complete and show their basal parts only. The most well-preserved strobilus (holotype) is of more or less cylindrical shape (Text-fig. 2a). It is about 61 mm long and 15 mm wide. The base of the strobilus is not visible. Second strobilus, which is also preserved almost completely, is very similar to the holotype, but somewhat narrower, 72 mm long and 12 mm wide. Each strobilus consists of densely arranged seed-bearing megasporangiate discs attached to the common axis in spiral order and forming well-pronounced parastichy (Text-figs 3a, b, 4a, b). Each observed parastichus on one side of the strobilus has three seed-bearing discs. Thus, one complete cycle should include ...