📚 Encyclopedia Update — September 25, 2026

Encyclopedia

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Research on Allocrioceras annulatum primarily focuses on its morphology and taxonomic placement within the Scaphitidae family. While no major new fossil discoveries or behavioral insights have been published in the last few years, ongoing studies continue to refine its evolution…

Ammonites hub

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Recent biostratigraphic studies have confirmed Mammites nodosoides as a key index fossil for the lower Turonian global stage, with refined oxygen isotope analysis providing new data on its thermal tolerance in the Western Interior Seaway. Current research emphasizes its role as …

Ammonites hub

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Recent research into Lewesiceras peramplum has focused on high-resolution stratigraphic analysis of the Turonian stage, confirming its role as a key index fossil for global correlation. New studies emphasize its significant size variation and shell ornamentation patterns across …

Encyclopedia

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Recent research into Tetragonites popetensis, particularly from the Yezo Group in Japan, has refined the understanding of its stratigraphic range during the Late Cretaceous. Studies emphasize its role as a stable indicator species for specific ammonoid assemblages in North Pacif…

Encyclopedia

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Recent research on Toxoceratoides royerianus emphasizes its role as an ammonite index fossil within the Aptian stage of the Lower Cretaceous. New stratigraphic studies have refined its appearance in the Tethyan realm, though specific taxonomic revisions for this species remain s…