Persicolaelaps Kazemi & Beaulieu was originally described as a monotypic genus of Laelapidae from the Hyrcanian broadleaf forests of northern Iran. The genus occurs in northern Iran and eastern North America, representing a striking and poorly understood biogeographic disjunction. What makes this record remarkable is not only morphological concordance but distributional discontinuity. The absence of European records raises critical questions. Did Pleistocene glaciations eliminate suitable refugial habitats across much of Europe? Have repeated climatic oscillations fragmented populations in intermediate regions? Alternatively, has long-term anthropogenic reduction of old-growth, deadwood-rich forests contributed to the regional disappearance or extreme rarity of such specialized taxa? Persicolaelaps hallidayi Kazemi & Beaulieu was originally described from rotten wood (holotype) and litter (two paratypes) in the Hyrcanian broadleaf forests of northern Iran. The North American record of the genus is based on a single museum specimen collected in 1975 from a coniferous forest in Connecticut, recovered from pine litter and rotten wood, representing a comparable late-stage decayed wood microhabitat. The genus is defined by a rare combination of structural characters, most notably six setae on trochanter IV, together with an anal shield incorporating JV3 and small sclerotized platelets surrounding the gnathosomal region. The Connecticut specimen exhibits the primary diagnostic features of Persicolaelaps despite minor morphological differences, supporting its placement within the genus. The Iranian and North American records are separated by a geographic distance, with no confirmed occurrences in Europe or western Asia, while European mite faunas are relatively well studied. Both records are consistently associated with late-stage decayed wood, particularly heavily decomposed, powdery substrates rather than superficial bark habitats, suggesting specialization to a narrowly defined microhabitat. The distributional pattern recalls well-known Hyrcanian–Appalachian floristic parallels, in which relict temperate forest lineages occur in northern Iran and eastern North America but are absent or rare in intervening regions. Similar fragmented Holarctic patterns have been documented in specialized saproxylic insects associated with advanced wood decay, indicating that microhabitat specialization can obscure broader biogeographic structure. Such cases underscore the importance of integrating taxonomy and biogeography in revealing hidden distributional histories. This remarkable disjunction suggests that our current understanding of forest microfaunal connectivity and persistence across the Holarctic remains incomplete. Focused sampling of late-stage decayed wood across temperate forests will be essential to test these hypotheses and clarify the evolutionary and biogeographic significance of this lineage.