A new species of Pachyseius Berlese (Acari: Pachylaelapidae) from South Siberia (Russia), with a key to the species known from Asia
Marchenko, Irina I.
Zootaxa
2015
3905
2
221
232
8XNHC
[730,865,799,825]
Arachnida
Pachylaelapidae
Pachyseius
GBIF
Animalia
Mesostigmata
9
230
Arthropoda
genus
1. Anterior margin of sternal shield with a pair of horn-like projections anterior to seta St1; presternal shields absent; posterior part of peritermatal shields fused to exopodal shields IV....................................................... 2 - Anterior margin of sternal shield without horn-like projections; presternal shields present; posterior part of peritermatal shields free, abutting exopodal shields IV........................................................................ 5 2. Dorsal idiosoma with 29 pairs of slightly spatulate setae ( z1absent)................. P. cavernicola Ishikawa, 1989; Japan - Dorsal shield with 30 pairs of acicular setae................................................................. 3 3. Ventri-anal shield with four pairs of pre-anal setae ( Jv1-Jv3, Zv2)................. P. sinicus Yin, Lu & Lan, 1986; China - Ventri-anal shield with at most three pairs of pre-anal setae..................................................... 4 4. Epistome triangular, with narrow distal projection; small sclerites between peritrematal and ventri-anal shields present; cir- cum-anal setae longer than anus............................................. P. chenpengi Ma & Yin, 2000; China - Epistome subrectangular, with anterior margin regularly rounded; small sclerites between peritrematal and ventri-anal shields absent; circum-anal setae as long as anus.............................. P. huanrenensis Chen, Bei & Gao, 2009; China 5. Ventri-anal shield with three pairs of pre-anal setae ( Jv1-Jv3).................................................. 6 - Ventri-anal shield with two pairs of pre-anal setae ( Jv1, Jv2).................................................... 7 6. Marginal and ventral soft integument with eight pairs of setae (including r6).......................................................................................... P. humeralis Berlese, 1910; Europe; Canary Islands, Caucasus - Marginal and ventral soft integument with six pairs of setae (including r6)..... P. masani Özbek & Halliday, 2014; Turkey 7. Tarsus II with at most three spur-like setae; presternal area weakly reticulate; ventri-anal shield suboval, slightly widened ante- riorly......................................................... P. angustus Hyatt, 1956; Europe; Iran, Caucasus - Tarsus II with one or two spur-like seta; one pair of sclerotised presternal shields present; ventri-anal shield subtriangular form with obvious anterolateral expansion...................................................................... 8 8. Tarsus II with two spur-like setae, marginal and ventral soft integument with 11 pairs of setae; trochanter I with five setae.................................... P. anisimovi sp. nov.; Russia: South Siberia (Altai, West and East Sayan Mountains) - Tarsus II with one spur-like setae, marginal and ventral soft integument with 12–19 pairs of setae, trochanter II with six setae.................................................................................................... 9 9. Marginal and ventral soft integument with 12 pairs of setae, ventri-anal shield with expanded anterolateral margins abutting metapodal shields; peritrematal shield at level of stigmata is greatly expanded.................................................. P. orientalis Nikolsky, 1982; Russia: south of Far East, South Siberia (East Sayan and Altai Mountains); China - Marginal and ventral soft integument with 19 pairs of setae, ventri-anal shield not conspicuously expanded anterolaterally;