Morphological images of Nassarius sinarum from Korea, China and Japan. A & B Specimens collected alive in the estuary at the mouth of the Yeongsan River in Korea (this study) and considered to be juvenile shells; apertural and dorsal views were photographed; C Specimen collected alive in China; D Specimen collected alive in the mudflats of Japan; morphological features of the apertural and dorsal views suggest it is an adult shell. Scale bars for A and B are 5 mm; scale bars for C and D are not provided. For original images and data, consult Suppl. material