Devonian tentaculitids from Central and Northeast Japan

Abstract

Two Lochkovian (Early Devonian) species, Tractabilis? sp. and Gotlandellites fukujiensis sp. nov., from the Fukuji Formation, and an Eifelian (Middle Devonian) species, Tentaculites sp., from the Nakazato Formation, are described and comprise the first modern treatment of tentaculitids in Japan. This discovery of Gotlandellites fukujiensis extends the stratigraphic range of the genus, which was previously known from the Early Silurian.