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.

The newly discovered mollusk lives in the abyss—below 3,300m—with an anemone on its shell, an arrangement that has not been seen before in this region. The study is published in the journal ...

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 ...