Constraining paleo-latitude of a biogeographic boundary in mid-Panthalassa: Fusuline province shift on the Late Guadalupian (Permian) migrating seamount

► Five fusuline intervals were revealed in sequence in the Middle Permian paleoatoll limestone in Japan. ► The extinction of fusuline occurred regardless of the Permian biogeographic provincialism in mid-Panthalassa. ► The paleo-latitude of the boundary between the Yabeina and Lepidolina territories was 12°S.