Pachylaelaps (Longipachylaelaps) bayburtensis, 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 : 245-248

Pachylaelaps (Longipachylaelaps) bayburtensis sp. nov.

( Figures 1–2 ; 5–9 ; 11–13 )

Diagnosis. Sperm induction system well sclerotised and very short, tubular and thumb-like; length of dorsal setae J4 / J5>2, seta j2 longer than j1; one teat-like gland pore (gdS4) present on posterolateral region of the dorsal shield; peritremes with anterior tips reaching base of setae z1; lateral and opisthogastric soft integument with 16 pairs of setae; tarsus II with two thick spur-like setae pl1 and pl2.

Material examined. Holotype female, Gençosman Village , 40° 9' N, 40° 20' E, 1745 m, alt. 18 April 2014, in moss . Paratypes: 3 females, same data as holotype ; 2 females, Yakupabdal Forest , 40° 3' N, 39° 43' E, alt. 1900 m, 18 April 2014, in litter of Platanus sp .; 3 females, Sarımeşe Village , 40° 27' N, 40° 18' E, alt. 1655m, 17 June 2014, in litter of Populus sp .; 4 females, Yakupabdal Forest , 40° 3' N, 39° 53' E, alt. 1835 m, 17 May 2013, in litter of Pinus sp .

Female. Dorsum ( Figure 1 ). Dorsal shield 759¯831 long, 435¯514 wide at the widest point, length/width 1.61¯1.75, oblong, ornamented with net-like pattern and punctation; gland pores gdS4 teat-like, gdZ1 subcircular; shield bearing 30 pairs of smooth and pointed setae, clunal setae J5 developed needle-like, setiform; length of J4 / J5: 2.8¯3.4 (J4 84–87, J 5 28–35); seta j1 36¯56, z1 28¯36, other dorsal setae more than 60 long (60¯100). Dorsomarginal setae much longer than dorso-central setae.

Venter ( Figure 2 ). Sternal shield 250¯273 long, 94¯103 wide at the level of coxae II, reticulate-punctate on surface, bearing four pairs of setae and three pairs of pore-like structures. St1 clearly longer than other sternal setae (st1 80¯90, st2¯st 4 60¯70). Genitiventral shield slightly longer than wide, length/width 1.08¯1.16, reticulate and punctate on surface, bearing two pairs of setae. Genitiventral shield and anal shield very close to each other ( Fig. 11 ). Anal shield 112¯132 long, 150¯182 wide, subtriangular, length/width 0.64¯0.80, with anus and three circumanal setae on the posterior half. One pair of metapodal shields present. Lateral and opisthogastric soft integument with 16 pairs of setae (seven pairs of marginal and nine pairs of opisthogastric). Peritremes with anterior tips reaching base of setae z1.

Spermathecal apparatus. Sperm access system associated with coxae IV, its distal part well sclerotised, slightly tubular, thumb-like and with clearly visible ductus ( Figs 5 , 12 ).

Gnathosoma ( Figures 6 ). Hypostome with seta h3 longest, h2 and palp coxal seta pc shortest and subequal in length; corniculi long and lanceolate, deutosternal groove with seven rows of denticles. Epistome with straight denticulate lateral margins and central projection with strong apical serration ( Fig. 7 ). Chelicera well developed with strong median teeth; movable digit about 80 long, with a large subdistal tooth and tripartite terminal hook, fixed digit 64¯66 long (to the dorsal seta), with tripartite distal hook and two more robust subdistal tooth; pilus dentilis minute ( Figs 8 , 13 ).

Legs. Chaetotaxy normal for the genus ( Mašán, 2007). Femur II with small spur-like projection ventrally. Tarsus II with two thick spur-like setae pl1 and pl2 ( Fig. 9 ).

Male and developmental stages. Unknown.

Etymology. This species is named after Bayburt Province, where it was collected.

Notes. Pachylaelaps (L.) bayburtensis sp. nov. is most similar to P. (L.) vicarius in the subgenus Longipachylaelaps . These species share some morphological features, such as the dorsal chaetotaxy, epistome, and the structure of chelicera, but there are very important difference in the shape of the sperm induction system.

Figures

FIGURES 1–2. Pachylaelaps (Longipachylaelaps) bayburtensis sp. nov., female. 1. Dorsal idiosoma; 2. Ventral idiosoma.

FIGURES 3–9. Pachylaelaps (Longipachylaelaps) vicarius., female. 3. Spermathecal ducts; 4. Chelicera. Pachylaelaps (Longipachylaelaps) bayburtensis sp. nov., female. 5. Spermathecal ducts; 6. Gnathosoma; 7. Epistome; 8. Chelicera; 9. Tarsus II.

FIGURES 10–13. Pachylaelaps (Longipachylaelaps) vicarius., female. 10. Spermathecal ducts. Pachylaelaps (Longipachylaelaps) bayburtensis sp. nov., female. 11. Genitiventral and anal shieds; 12. Spermathecal ducts; 13. Chelicera