The « Miyauchi's Neptune » is a cold-water buccinid with fascinating sculpture native to the Sea of Okhotsk, ranging from northern Hokkaido, Japan to the Kuril Islands. It is a very rare species and is extremely difficult to acquire in fine condition. Many consider it to be a form of Beringius frielei Dall, 1895 but it is clearly distinct from that species with much stronger sculpture, a much more slender shell, and shallower suture. It is also often treated as a subspecies of B. frielei, although this possibility cannot be excluded the geographical distribution of the two species overlap and it is perhaps best to consider them as separate species. A carnivorous and scavenging gastropod, it inhabits soft bottoms of rather deep water ranging between about -100~500m in depth. The apex is always corroded in adult specimens. Typical shell length around 100mm., very large specimens may exceed 130mm.

Urup Island, Kuril Islands.