New and rare bivalve species for the fauna of the Kuril Islands (northwestern Pacific Ocean): A study of materials collected over 70 years of expeditions (from 1949 to 2019) Author Lisitsyna, Kseniya N. 0000-0001-6408-6796 A. V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Palchevskogo Street, 17, Vladivostok 690041, Russia. lisitsina_ksenia_1997@mail.ru Author Kamenev, Gennady M. 0000-0002-9754-3436 A. V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Palchevskogo Street, 17, Vladivostok 690041, Russia. gennady.kamenev@mail.ru & gmkamenev@gmail.com text Zootaxa 2024 2024-10-15 5523 2 231 253 http://dx.doi.org/10.11646/zootaxa.5523.2.6 journal article 10.11646/zootaxa.5523.2.6 1175-5326 13934243 CCD8C83F-4132-43C2-90E1-462FEB07ED34 Acila insignis (A. Gould, 1861 ) ( Fig. 2 C, D ) Nucula (Acila) insignis A. Gould, 1861: 36 . Acila (Truncacila) insignis ( Gould, 1861 ) — Lutaenko & Noseworthy 2012: 21 , pl. 1, figs. G–J, text-fig. 3. Material examined : 12 specimens from the Kunashirsky Strait (50– 1,000 m ) . Distribution : Yellow Sea; Sea of Japan ; Kuril Islands (Kunashir Island (Izmena Bay)), Kunashirsky Strait (5– 1,000 m ) ( Scarlato 1981 ; Evseev 2000 ; Kurozumi & Tsuchida 2000 , 2017; Kantor & Sysoev 2005 ; Lutaenko & Noseworthy 2012 ; Lee 2014 ). Remarks : The finding of this species in Izmena Bay (Kunashir Island) was only briefly mentioned by Evseev (2000) . In other parts of its range, it was found only to a depth of 650 m ( Lee 2014 ). Acila insignis well differs from Acila divaricata by the absence of a distinct radial fold and a rostrum at the posterior end of the shell.