Pachylaelaps (Longipachylaelaps) bergomensis , Mašán, Peter, 2017

Mašán, Peter, 2017, Four new species of the subgenus Pachylaelaps (Longipachylaelaps) from Italy, with a new identification key to the known species (Acari: Pachylaelapidae), Zootaxa 4236 (1), pp. 95-117: 100-101

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Pachylaelaps (Longipachylaelaps) bergomensis

sp. nov.

Pachylaelaps (Longipachylaelaps) bergomensis  sp. nov.

( Figs 14 View Figure ¯26, 37, 54)

Specimens examined. Holotype female: North Italy, Bergamo City , Astino Valley, Bosco di Astino, broadleaved deciduous forest (with Quercus robur  , Q. petraea  , Q. cerris  , Castanea sativa  , Carpinus betulus  , Robinia pseudoacacia  , Betula  sp., Fraxinus  sp., Corylus avellana  , Crataegus  sp., Viburnum lantana  , Cornus mas  , ao.), leaf litter and soil detritus, altitude 265 m, 13 May 2015, coll. P. Mašán  . Paratypes: 19 females and 21 males, with the same data as in holotype  .

Diagnosis. In female, tubiform structures of sperm induction system relatively large, with apices adjacent but separated, moderately narrowed toward apices, vase-like ( Figs 16 View Figure , 23‒26 View Figure ). Male spermatodactyl expanded submedially, leaf-like, without distinct angustate subdistal or apical portion, less than double the length of the movable digit ( Figs 20 View Figure , 54 View Figure ). Palptibia with two divergent petal-like projections: antiaxial projection longer, widened medially, rounded distally, with small subapical incision, and small lamellar prominence at its inner base; paraxial projection shorter, subtriangular, and tapered toward obtuse apex ( Figs 21 View Figure , 37 View Figure ).

Description. FEMALE.

Dorsal idiosoma ( Fig. 14 View Figure ). Dorsal shield 780–925 µm long and 460–560 µm wide, elongated and suboval (length/width 1.63–1.85), delicately and evenly reticulated on surface, bearing 30 pairs of dorsal setae. Dorsal setae uniform, smooth and needle-shaped, mostly subequal in length, relatively longer and mostly with tips reaching to or beyond insertions of following setae; setae z1 shortest. For length and spacing of some selected dorsal shield setae see Table 1. Dorsolateral soft integument with seven pairs of marginal setae (r6, R1, R3‒R7).

Ventral idiosoma ( Fig. 15 View Figure ). Sternal shield 270–290 µm long, slightly shorter than genitiventral shield (length of sternal shield/length of genitiventral shield 0.9–0.95). Genitiventral shield almost subequal in length and width (length 289–318 µm, width 289–310 µm, length/width 0.93–1.05). Anal shield subtriangular, 121–143 µm long and 173–213 µm wide (length/width 0.58–0.74); anus with three circum-anal setae situated close to posterior margin of shield. Peritremes normally developed, anterior tips reaching dorsal surface close to insertions of setae z1. Ventral shields with delicate reticulation on surface. Metapodal platelets minuscule, free on soft integument. Ventral soft integument with nine pairs of ventral setae (JV2–JV5, ZV1–ZV5). Ventral setae similar to those on dorsal idiosoma.

Sperm induction structures ( Figs 16 View Figure , 23‒26 View Figure ). Tubiform structures of sperm induction system well developed, relatively large, with apices adjacent but separated, weakly sclerotised except short apical to subapical portions, moderately and regularly narrowed toward apices, with bases closely abutting anterior inner margin of coxae IV.

Gnathosomal structures ( Figs 17, 18 View Figure ). Corniculi elongated and horn-like; laciniae densely pilose, as long as corniculi; deutosternum with six rows of denticles; subcapitular setae smooth and needle-shaped. Epistome with subtriangular and regularly narrowed base, narrow central neck and widened apical part densely crenulate anteriorly; basal part with denticulate lateral margins ( Fig. 17 View Figure ). Fixed digit of chelicera with bifid terminal hook, one large distal tooth associated with pilus dentilis, and one additional distal denticle on lateral ridge; pilus dentilis well developed, curved and directed backward; movable digit of chelicera unidentate, with simple hook and one distal tooth ( Fig. 18 View Figure ).

Legs. Leg setation normal for genus (Mašán, 2007). Tarsus II with two spur-like distal setae, pl1 and pl2 ( Fig. 19 View Figure ).

MALE. Dorsal idiosoma. Dorsal shield 720‒810 µm long and 425‒475 µm wide, elongated and suboval (length/width 1.62‒1.71).

Ventral idiosoma. Sternal, genitiventral, peritrematal, metapodal and anal plates fused to form an entire holoventral shield bearing nine pairs of setae (st1‒st5, JV1‒JV3, ZV2), not including three circum-anal setae close to anus; shield with reticulate sculpture on surface. Dorsolateral and ventral soft integument with 13 pairs of setae (r6, R1, R3‒R7, JV4, JV5, Zv1, ZV3‒ZV5). Dorsal and ventral chaetotaxy and other characters as in female.

Gnathosomal structures ( Figs 20, 21 View Figure , 37 View Figure , 54 View Figure ). Cheliceral spermatodactyl 130‒150 µm in length, 2‒2.25 times as long as movable digit, expanded submedially, slightly curved, leaf-like to scimitar-like, with smooth margins and relatively wide terminal portion ( Figs 20 View Figure , 54 View Figure ). Palptibiae slightly thickened basally, each bearing a pair of petal-like projections on proximal ventral surface, as in Figs 21 View Figure and 37 View Figure ; projections relatively large, with divergent adjacent margins: antiaxial projection longer, with narrow base, wide medial expansion, rounded distal margin, small subapical incision and small lamellar prominence at its inner base; paraxial projection shorter, subtriangular, widened basally and tapered toward obtuse apex. Palpfemur with distinct papular tubercle on anterolateral basal surface.

Legs. Medial segments of legs II spurred on their distal ventral surface: femur with one robust spur, genu and tibia each with a peg-like spur, as in Fig. 22 View Figure . Femoral spur broadened in basal part, produced into narrowly rounded apex, with two small tubercles on axillary side ( Fig. 22 View Figure ). Terminal part of tarsus II with only one spur-like distal seta, pl1.

Etymology. The epithet of this species is derived from the Latin name “ Bergomum ” (Bergamo) and alludes to the type locality situated in the urban area of Bergamo City.

Taxonomic notes. The new species may be distinguished from the other congeners by the characters discussed in the diagnosis (see above), and the key below. In addition, the species differs from the related species by the features listed in Table 2.