Fossils found in the northern part of Hokkaido are a new type of ammonite, the once-ubiquitous spiral-shelled creatures that went extinct with the dinosaurs 65 million years ago, researchers said.

This is different from the flat sole typical of modern mollusks. ・Emo Vorticaudum: Sporting two small, shell-like valves near its head and a tapering tail encased in a spiral of spines ...