First records of spider species Dolomedes senilis Simon, 1880 (Araneae: Pisauridae) and Agelenopsis potteri (Blackwall, 1846) (Araneae: Agelenidae) on Sakhalin Island
Dolomedes senilis Simon, 1880 and Agelenopsis potteri (Blackwall, 1846) are recorded from Sakhalin Region for the first time. They are known from territories adjacent to Sakhalin, but were not recorded for the island. The distribution of D. senilis and A. potteri, as well as other representatives of the families Pisauridae and Agelenidae, in the Sakhalin Region is also discussed. The main identifying features of the species are given. Photographs of the appearance of spiders, the epigyne of the female of D. senilis and the palp of the male of A. potteri are given.