Abstract
This study provides additional morphological information and new illustrations for three species of Ololaelaps Berlese described by Bregetova & Koroleva (1964) from Russia—O. caucasicus, O. sellnicki and O. ussuriensis—to supplement the original descriptions. Since holotypes for these three species were not designated, a lectotype is chosen from among the syntypes of each examined species. We describe the adult male and female of Ololaelaps altaiensis Joharchi sp. nov., from specimens collected from moss on the shore of the Teletskoye Lake, in Altai Mountains, Russia. The new species is distinguished from other Ololaelaps species by its short peritremes, ending near the middle of coxae II. The new species also has elongate paradactyli, extending well beyond the pretarsal claws; this feature appears to be correlated with the species’ semiaquatic habitat, and such correlation between tarsal morphology and ecology occurs in other species of Ololaelaps and of Gaeolaelaps with similar habitats.
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