-300~400m, Trawled on mud, Choshi, Chiba Prefecture, Japan, 131.0mm.
Beringius polynematicus is a cold-water buccinid ranging from northern Japan to Bering Sea. It is similar to Beringius frielei (Dall,1895) and sometimes confused with it, but B. frielei have numerous deep spiral ridges in reglar intervals on the upper half of the body whorl which is lacking in B. polynematicus. A common carnivorous / scavenging species found on muddy bottoms around -150~500m deep, it is edible and sometimes seen in Japanese fish markets. Typical shell length around 140mm., very large specimens may exceed 170mm. It is quite variable in form and may be much wider than the fusiform specimen shown.