A new fossil species Perca neopleistocenica Kovalchuk, sp. n. from Southern Ukraine is described. It differs from other species of the genus by width and configuration of praeoperculum, and also by quantity of cogs on the ...
Hemirhopalum alleni Hava, sp. n. from Bolivia (South America) is described, illustrated and compared with two similar species: Hemirhopalum bicolor Sharp, 1902 and H. brasiliense Herrmann et Hava, 2013.