Onchodellus turcicus, Şahin & Özbek, 2018

Şahin, Gülhan & Özbek, Hasan Hüseyin, 2018, Mites of the family Pachylaelapidae in Bayburt Province, Turkey (Acari: Mesostigmata), with a new record and three new species, Zootaxa 4514 (2), pp. 243-255 : 248-250

Onchodellus turcicus sp. nov.

( Figures 14–25 ; 32–34 )

Diagnosis: Dorsal setae J4 and J5 slightly differing in length; lateral and opisthogastric soft integument with 14 pairs of setae; anterior tips of peritremes reaching the base of setae z1, but not extending beyond it; surface of dorsal and ventral shields well reticulated. In male, cheliceral spermatodactyl more than double length of moveable digit, distally tapered, not pointed apically; tarsus II with spur-like distal seta pl1 and well developed opposite anterolateral process; femur IV with uniform setae and two distinct processes on ventral side, the smaller one medial, the larger one terminal; processes on genu II and tibia II distinct and truncated distally.

Material examined: Holotype female, Bayburt Province, Üzengili Wold , 40° 30' N, 40° 23' E, alt. 2831 m, 17 June 2014, in moss . Paratypes: 4 females, 2 males, the same data as holotype ; 4 females, 1 male, Aydıntepe Wold , 40° 25' N, 40 °11' E, alt. 2200 m, 1 May 2013, in moss ; 1 female, Aydıntepe Wold , 40° 26' N, 40° 7' E, alt. 2195 m, 17 May 2013, in moss ; 1 female, 10 males, Uluçayır Village , 40° 14' N, 40°17' E, alt. 1889 m, 2 July 2013, in litter ; 35 female, 6 males, Aydıntepe Wold , 40° 27' N, 40° 6' E, alt. 2450 m, 1 April 2014, in moss ; 3 females, Demirözü District , 40° 13' N, 40° 3' E, alt. 1659 m, 5 April 2014, in moss ; 2 females, Kitre Village , 40° 17' N, 39° 52' E, alt. 1734 m, 5 April 2014, in litter of Salix sp .; 9 females, 2 males, Gençosman Village , 40° 9' N, 40° 20' E, alt. 1745 m, 18 April 2014, in moss ; 6 females, 3 males, Demirözü District , 40° 9' N, 39°52' E, alt. 1676 m, 1 May 2014, in moss, a female, Kop Gateway, 40° 2' N, 40° 30' E, alt. 2417 m, 18 May 2014, in moss near stream ; 68 females, 7 males, Aydıntepe Wold , 40° 27' N, 40° 6' E, alt. 2450 m. 1 June 2014, in moss ; 3 females, Kılıçkaya Village , 40° 28' N, 40° 15' E, alt. 1736 m, 17 June 2014, in litter of Astragalus sp .; 35 females, 3 males, Aygır Lake , 40° 31' N, 40° 23' E, 17 June 2014, 2845 m, in moss near lake; a male, Üzengili Wold, 40° 30' N, 40° 24' E, alt. 2680 m, 17 June 2014, in moss ; 21 female, 5 male, Sarımeşe Village , 40° 27' N, 40° 18' E, alt. 1655 m, 17 June 2014, decaying wood .

Female. Dorsum ( Figure 14 ). Dorsal shield 583¯653 long, 319¯412 wide at the widest point, length/width 1.55¯1.85, oblong, its surface reticulated, bearing 30 pairs of smooth and pointed setae, clunal setae J5 45¯55; a pair of posterolateral teat-like gland pores gdS4 on the shield, gdZ1 subcircular and paraxial to line Z1̄Z2. Dorsal setae j1 30¯40 long, J4/J5 1.11¯1.41 (J4 60¯75); z1 15¯20, other dorsal setae between 50 and 75 long, posterodorsal setae slightly longer.

Venter ( Figure 15 ). Sternal shield 183¯194 long, 105¯113 wide at the level coxae II, its surface ornamented with a reticulate pattern, bearing four pairs of pointed setae and three pairs of pores; st1 clearly longer than other sternal setae (st1 60¯72; st2¯st 4 50¯60). Genitiventral shield longer than wide, length/width 1.05¯1.13, ornamented with a polygonal pattern, bearing two pairs of setae. Anal shield 68¯87 long, 104¯166 wide, length/ width 0.61¯0.73, triangular, ornamented with lines ( Fig. 32 ). One pair of metapodal shields present. Lateral and opisthogastric soft integument with 14 pairs of setae (six pairs of marginal and eight pairs of opisthogastric). Anterior tips of peritremes reaching the base of setae z1.

Spermathecal apparatus. Sperm access system associated with coxae III, tubes long, tenuous, lightly narrowed in anterior section ( Fig. 16 ).

Gnathosoma ( Figure 17 ). Hypostome with seta h3 longest, h2 and palp coxal seta pc shortest and subequal in length; corniculi horn-like and lanceolate, deutosternal groove with six rows of denticles. Epistome with straight denticulate lateral margins and central projection with strong apical serration ( Fig. 18 ). Chelicera well developed with strong subdistal teeth; movable digit 70¯77 long, with a large subdistal tooth, a small subdistal denticle and unidentate terminal hook, fixed digit about 70 long (to the dorsal seta), with a unidentate distal hook, a robust subdistal tooth, and a small subdistal and a submedial denticles; pilus dentilis minute ( Figs 19 , 33 ). Arthrodial brush short.

Legs. Chaetotaxy normal for the genus ( Mašán, 2007). Femur II with small spur-like projection ventrally. Tarsus II with a thick spur-like setae pl1 ( Fig. 20 ).

Male. Dorsum. Dorsal idiosoma 479¯562 long, 294¯365 wide at widest point, length/width 1.53¯1.62. Ornamentation and dorsal chaetotaxy like that of female.

Venter ( Figure 21 ). Holoventral shield 415¯480 long, 76¯86 wide at the level of coxae II, ornamented with the reticulate pattern and bearing 5 pairs of needle-like setae and 3 pairs of pores. Opisthogastric region of shield with three pairs of setae, three circum-anal setae. Dorso-lateral and opisthogastric soft integument with 10 pairs of setae.

Gnathosoma . Epistome with denticulate anterolateral margins, median process short and widened, with strong apical serration. Moveable digit of chelicera 55–60 long, with a large subterminal tooth very close to unidentate terminal hook, spermatodactyl 123–135 long, more than double (2.23–2.45) the length of moveable digit, progressively narrowed in distal section, truncated apically, shaped “b” like in all male specimens. Fixed digit with a subdistal tooth, a large subdistal denticle and a terminal hook, pilus dentilis clearly visible ( Fig. 22 , 34 ). Palptibiae without any processes.

Legs. Tarsus II with one spur-like seta p11 and opposite anterolateral apophysal spur; apophysal spur robust distinctly larger than pl1 ( Fig. 23 ). Femur II with large and finger-like spur-like process; genu and tibia each with a small ventral distally truncated processes ( Fig. 24 ). Femur IV with two distinct processes on ventral side, smaller one located medially, larger one located terminally ( Fig. 25 ).

Etymology. The species is named after the type locality, Turkey.

Notes. Onchodellus turcicus sp. nov. has characteristic features in the genus Onchedellus, such as two distinct processes on femur IV and well developed distal processes in males. It is similar to O. montivagus Mašán, 2007 in some characters, such as longer dorsal setae, well reticulated ventral shields and 14 pairs of setae on lateral and ophistogastric region, longer and distally tapered spermatodactyl (more than double the length of the moveable digit), telofemur IV with uniform setae in males. There are important differences between these two species, such as larger body size (593¯ 653 in O. turcicus , 515¯ 550 in O. montivagus ), length of dorsal setae J4 and J5 (J4 60¯75, J5 45¯ 55 in O. turcicus , J4 56¯62, J5 37¯ 42 in O. montivagus ), apical tips of peritremes (reaching base of z 1 in O. turcicus , not reaching base of z 1 in O. montivagus ), process of tibia II (truncated in O. turcicus , pointed O. montivagus ), spermatodactyl length (more than double the length of movable digit in O. turcicus , three or four times as long in O. montivagus ), opposite anterolateral process distinctly larger than pl 1 in O. turcicus (slightly larger in O. montivagus ), two distinct processes on femur IV in O. turcicus (absent in O. montivagus ).

Figures

FIGURES 14–15. Onchodellus turcicus sp. nov., female. 14. Dorsal idiosoma; 15. Ventral idiosoma.

FIGURES 16–20. Onchodellus turcicus sp. nov., female. 16. Spermathecal tube; 17. Ventral gnathosoma; 18. Epistome; 19. Chelicera; 20. Tarsus II.

FIGURES 21–25. Onchodellus turcicus sp. nov., male. 21. Ventral idiosoma; 22. Chelicera; 23. Tarsus II; 24. Femur, genu and tibia of leg II; 25. Femur IV.

FIGURES 32–36. Onchodellus turcicus sp. nov., female. 32. Genitiventral and anal shields; 33. Chelicera. Onchodellus turcicus sp. nov., male. 34. Chelicera. Onchodellus montanus sp. nov., female. 35. Genitiventral and anal shields; 36. Chelicera.