Two New Species of Bristletails of the Genus Pedetontus Silvestri 1911 (Microcoryphia, Machilidae) from the Russian Far East

Abstract—The relatively large Indo-Malayan-Holarctic genus Pedetontus Silvestri, 1911 has so far included 33 described species. The genus has two subgenera including the nominative subgenus Pedetontus s. str., with seven species (6 from North America and one from Kamchatka) and Verhoeffilis Paclt, 1972, with 26 species (three species from North America, 12 from the southeastern Palearctic and 11 from the Indo-Malayan Region). Both subgenera are distinguished by the arrangement of two pairs of eversible vesicles on abdominal segments II–VI or II–V, respectively. This paper describes two new species of the latter subgenus from the Primorsky Territory of the Russian Federation: P. furuhjelmi sp. n., from Furugelm Island, and P. nigrus sp. n., from Ussuriysk environs. Both are very close to P. ussuriensis Kaplin, 1980, widespread in the Primorsky Territory, and P. silvestrii Mendes, 1993, from North Korea, but they differ well in body length, the relative length of the antennae, the structure of the antennal flagella, the compound eyes, the paired ocelli, the maxillary and labial palps, the sternites, styli and coxites of abdominal segment IX, as well as by the chaetotaxy of the legs and urocoxites IX, and the ovipositor.