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March 29, 2026Палеонтологический журнал / Paleontological Journal0 citations

A New Species of the Genus Boreophylloceras Alekseev et Repin, 1998 (Ammonoidea, Phylloceratida) from the Upper Ryazanian of the North of Eastern Siberia

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AIA.E. Igolnikov

Key Points

  • This research aims to assess the taxonomic classification of Boreophylloceras and describe a new species.
  • Conducted a review of existing taxonomic classifications of Boreophylloceras.
  • Described the new species B. subtile based on fossils from the upper Ryazanian.
  • Evaluated key morphological features influencing the classification.
  • Identified two opposing viewpoints on taxonomic features of Boreophylloceras.
  • Described the very large size of protoconch and ammonitella in the new species.
  • Confirmed the initial ventral-marginal position of the siphon as significant for classification.

Abstract

A review of modern views on the position of Boreophylloceras Alekseev et Repin, 1998 in the phylloceratid system is carried out. Two opposing viewpoints are shown on the assessment of the weight of taxonomic features of this genus, such as the very large size of the protoconch and ammonitella, the initial ventral-marginal position of the siphon, etc. A new member of the genus B. subtile sp. nov. is described from the upper Ryazanian (Bojarkia mesezhnikowi zone) of the north of Eastern Siberia (Popigay River basin).

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Cite This Study

A.E. Igolnikov (2025) studied this question.

synapsesocial.com/papers/69c8c28cde0f0f753b39ce1ehttps://doi.org/10.7868/s3034587125050052
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