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- W3024731196 abstract "Abstract Ptychites is among the most widely distributed ammonoid genera of the Triassic and is namesake of a family and superfamily. However, representatives of the genus mostly show low-level phenotypic disparity. Furthermore, a large number of taxa are based on only a few poorly preserved specimens, creating challenges to determine ptychitid taxonomy. Consequently, a novel approach is needed to improve ptychitid diversity studies. Here, we investigate Ptychites spp. from the middle and late Anisian of Nevada. The species recorded include Ptychites embreei n. sp., which is distinguished by an average conch diameter that is much smaller and shows a more evolute coiling than most of its relatives. The new species ranges from the Gymnotoceras mimetus to the Gymnotoceras rotelliformis zones, which makes it the longest-ranging species of the genus. For the first time, the ontogenetic development of Ptychites was obtained from cross sections where possible. Cross-sectioning highlights unique ontogenetic trajectories in ptychitids. This demonstrates that, despite showing little phenotypic disparity, Ptychites was highly ontogenetically differentiated, and thus the high taxonomic diversity at the species level is justified for the species investigated. UUID: http://zoobank.org/5abe2487-8a00-4b48-adc7-ec7db7a097f7" @default.
- W3024731196 created "2020-05-21" @default.
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- W3024731196 date "2020-05-11" @default.
- W3024731196 modified "2023-10-02" @default.
- W3024731196 title "Ontogenetic analysis of Anisian (Middle Triassic) ptychitid ammonoids from Nevada, USA" @default.
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- W3024731196 doi "https://doi.org/10.1017/jpa.2020.25" @default.
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