What question did this study set out to answer?

This research aims to identify new species and records of the Falcinebria subgenus in Japan.

May 4, 2026Open Access

Two new species and new records of the ground beetle subgenus Falcinebria Ledoux Roux, 2005 (Coleoptera, Carabidae, Nebria) from Tohoku District, northern Honshu, Japan

Key Points

This research aims to identify new species and records of the Falcinebria subgenus in Japan.
Describes two new species of Falcinebria from Tohoku District, Japan.
Reports new collection records for existing species.
Sedimentary analysis from specified localities within Iwate and Akita.
Two new species, N. hayachinensis and N. yuda, were discovered.
Found the northernmost collection of N. niohozana and southernmost for N. sagittata.
Enhanced understanding of the geographical distribution and diversity of the Falcinebria subgenus.

Abstract

Falcinebria Ledoux and N. yuda sp. nov. from Hinosawa, Nishiwaga-machi, Iwate (type locality) and Mt. Mahiru-dake, Akita. Additionally, new records are reported for N. niohozana Bates, 1883 and N. sagittata Sasakawa, 2020; the records for the former species include its northernmost collection record, while the record for the latter represents its southernmost collection record.

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