Overview
- Researchers from Kuji Amber Museum and Waseda University announced Friday that they recovered a single mammal tooth from Kuji City strata dated to about 90 million years ago.
- The team identified the tooth as belonging to therian mammals, the group that includes the ancestors of placental mammals and humans, and said it may represent a previously unknown species.
- The fossil's age and group assignment matter because mammal remains from the late Cretaceous are globally rare and can help explain how mammals lived alongside dinosaurs.
- Institutions including the Fukui Prefectural Dinosaur Museum provided three-dimensional reconstructions and researchers used CT imaging to analyze the specimen, but a full morphological description and peer-reviewed paper have not yet been published.
- Next steps are formal comparison, detailed description and naming, and the find underscores active regional museum collaborations and ongoing fieldwork in Kuji that have already produced many other vertebrate fossils.