-300m, Trawled on mud bottom, East China Sea, 104.3mm., 2011/v.
The « Adelphic Japelion » is a moderately large cold-water buccinid ranging from central Honshu, Japan to Korea to East China Sea with some records from Taiwan and South China Sea. A carnivorous / scavenging gastropod inhabiting sandy to muddy bottoms of moderate depths around -50~400m, it appears to be common in East China Sea but uncommon to rare in other areas. Although somewhat variable in stoutness its shell is generally fairly slender and spindle-shaped. Similar to other slender Japelion species from the same area such as J. hirasei (Pilsbry, 1901) and J. pericochlion (Schrenk, 1863) but may be distinguished by having no subsutral platform but only a deep channel. Typical shell length around 80mm., very large specimens may exceed 110mm.