Bathyal Rissoidae (Gastropoda: Rissooidea) off the Russian Far East coast of the Sea of Japan, with redescription of Punctulum reticulatum Golikov, 1986 Author Hasegawa, Kazunori text Ruthenica, Russian Malacological Journal 2022 2022-04-01 32 2 85 92 http://dx.doi.org/10.35885/ruthenica.2022.32(2).5 journal article 10.35885/ruthenica.2022.32(2).5 2307-7336 11041109 “ Alvania” akibai ( Yokoyama, 1926 ) ( Fig. 2A ) Rissoa ( Alvania ) akibai Yokoyama, 1926: 275 , pl. 34, fig. 3 (see Hasegawa [2014] for more detailed synonymy). Material examined . SoJaBio A 2-10, MIBM 39336 ( Fig. 2A ); SoJaBio B 6-7, MIBM 14492; SoJaBio B 7-7, MIBM 39342 [depth range: 455–1011 m ]. Additional material examined (cited from Hasegawa, 2014 ). ZIN , non-registered, off Primorsky Krai , 44°48.5’N , 136°46.0’E , 373–494 m (voucher specimen of Punctulum sp. fide Golikov et al ., 2001: 158 ) . Distribution . Off Primorsky Krai coast on the northern slope, and from Musashi Bank to off Shimane Prefecture on the southeastern slope in the Sea of Japan , within the depth range of 220–1011 m . Remarks . This species was originally described based on fossils from the Pliocene Sawane Formation on Sado Island in the Sea of Japan , and is characterized by the peculiar pockmarked protoconch sculpture [ Hasegawa, 2014 : fig. 37D]. Its previously known vertical distribution range was 220–635 m , and that is significantly extended to 1011 m in the present study.