Three new species of the genusHyalopecten(Bivalvia: Pectinidae) from the abyssal and hadal zones of the North-western Pacific Ocean

Abstract

Three new species,Hyalopecten vityazisp. nov.,H. abyssalissp. nov. andH. kurilensissp. nov., are described from the abyssal and hadal zones of the North-western Pacific.Hyalopecten vityaziwas found in the Kuril-Kamchatka and Aleutian trenches at 6090–8100 m depth. It is the most deep-water species of the order Pectinida.Hyalopecten abyssalisandH. kurilensiswere found at the abyssal plain adjacent to the Kuril-Kamchatka and Aleutian trenches at 4550–5045 m depth. To date, 13 species of the genusHyalopectenare known from different regions of the World Ocean. A table with the main differences among all known species in the genus is provided.