The scalpelliform genus Stramentum is described from upper Turonian-Coniacian (Upper Cretaceous) strata in the Mikasa area, Hokkaido (Japan), documenting the first record of the genus from the north-west Pacific Realm. The single articulated skeleton, which is horizontally embedded in a dark grey laminated mudstone, is specifically indeterminate because capitular plates are missing. However, peduncular morphology resembles that of S. (S.) pulchellum (Sowerby Jr), which has been described from the Cenomanian-Turonian of Europe. The present record from Japan demonstrates that this cirripede genus had a wider geographic distribution than previously assumed during the youngest phase of its radiation.
All Science Journal Classification (ASJC) codes
- Ecology, Evolution, Behavior and Systematics