Bisetocreagris parva, Guo & Fe. Zhang, 2017

Guo, Xiangbo & Zhang, Feng, 2017, Two New Species Of Bisetocreagris Ćurčić, 1983 (Pseudoscorpiones: Neobisiidae) From China, Acta Zoologica Academiae Scientiarum Hungaricae 63 (1), pp. 71-82 : 77-81

Bisetocreagris parva sp. n.

(Figs 4–6)

Typematerial – Holotypemale (Ps.- MHBU-ZJ13102701 ), China: ZhejiangProvince , HangzhouCity , TongluCounty, PhoenixCemetery (29°49’N, 119°41’E), alt. 40 m, 27 October 2013, leg: ZhizhongGao. Paratypes: twomalesandfourfemales (Ps.- MHBU – ZJ13102702–07 ), samedataasforholotype .

Etymology – ThespecificnameisderivedfromtheLatinadjective “ parvus ”, meaning small, referringtothebodysizeofthenewspecies.

Diagnosis – Smallspecies, lengthofpedipalpalfemuratmost 0.39 mm; rallumwith 7 blades; pedipalpalfemur, patellaandchelawithgranulations onmedialface, femur 2.50, patella 2.06–2.20, chela (withoutpedicel) 3.05–3.18 timeslongerthanbroad, movablefinger 1.48–1.57 timeslongerthanhand (withoutpedicel).

Description – Male (Fig. 4a) – Colourmostlypaleyellow, pedipalps, carapaceand cheliceraereddishyellow. Setaeofbodystraightandacicular.

Carapace (Figs 5a, 6a) – Smooth, 1.22–1.24 timeslongerthanbroad, withatotalof 24 setae, including 4 ontheanteriormarginand 6 ontheposteriormargin; epistomesmall, triangular; 4 eyespots, withweaklens.

Chelicera (Figs 5b, 6d) – Handwith 7 setae, movablefingerwith 1 seta; fixedfinger with 9–11 teeth; movablefingerwith 7 teeth; serrulaexteriorwith 32–35 lamellae; serrula interiorwith 28–30 lamellae. Galea (Fig. 5c) smallandacuminate, withoutbifurcation. Rallum (Fig. 5e) with 7 blades, allwithanteriorly-directedspinules, basalmostbladetheshort- estanddistalmostbladewidenedatbase.

Pedipalps (Figs 5f,g, 6b,c) – Apexofpedipalpalcoxarounded, with 3 setae. Pedipalpalfemurandpatellawithgranulationsonmedialface, femursturdy, chelawithgranula- tionsonmedialandlateralface. Trochanter 1.73–1.91, femur 2.50, patella 2.06–2.20, chela (withpedicel) 3.26–3.47, chela (withoutpedicel) 3.05–3.18 timeslongerthanbroad, movablefinger 1.48–1.57 timeslongerthanhand (withoutpedicel). Fixedchelalfingerwith 8 andmovablefingerwith 4 trichobothria: eb and esb onlateralmarginofhand, and esb slightlyabove eb; ib, isb and ist inbasalhalf, est, et and it indistalhalfoffixedfinger, and et moredistalthan it; t and st nearthemiddleofmovablefinger, sb and b inbasalhalf. Venom apparatuspresentonlyinfixedchelalfinger, venomductveryshort. Chelalteethrounded andcontiguous, fixedfingerwith 49–52 andmovablefingerwith 43–47 teeth.

Abdomen – Pleuralmembranegranulated. Tergitesandsterniteswithuniseriatese- tation, tergal chaetotaxy (I–X): 9–10: 11: 11: 11–12: 11–12: 11: 11–12: 12: 9–11: 10–11, sternal chaetotaxy (IV–X): 9–10: 13–14: 13–14: 13–15: 12–14: 11–13: 11–12; stigmatawith 2 small setaeonanteriormargin, analconewith 2 dorsaland 2 ventralsetae. Malegenitalarea (Figs 5h, 6e): sterniteIIwithamedianandposteriorgroupof 13–14 setae; sterniteIIIwith ananteromedianbisetousgroove, followedby 10–14 medianandposteriorsetae.

Legs – LegI (Figs 5j, 6g) andlegIV (Figs 5k, 6h) typical. TibiaIVwithonemiddletac- tileseta (TS=0.48–0.50), basitarsusIVwithonetactilesetainbasalhalf (TS=0.22), telotarsus IVwithonesub- medialtactileseta (TS=0.40). Subterminaltarsalsetabifurcate; aroliumnot divided, shorterthantheslenderandsimpleclaws.

Female (Fig. 4b) – asinholotypeexceptwherenoted.

Chelicera – Fixedfingerwith 8–9 teeth; movablefingerwith 7–8 teeth; serrulaexte- riorwith 34–37 lamellae; serrulainteriorwith 32–35 lamellae. Galea (Fig. 5d) dividedinto twomainbranches, eachtinedistallybifurcate.

Pedipalps – Trochanter 1.50–1.67, femur 2.40–2.44, patella 2.06–2.12, chela (withpedi- cel) 3.09–3.20, chela (withoutpedicel) 2.82–2.95 timeslongerthanbroad, movablefinger 1.20–1.29 timeslongerthanhand (withoutpedicel). Chelalteethroundedandcontiguous, fixedchelalfingerwith 49–54 andmovablefingerwith 41–46 teeth.

Fig. 4. Bisetocreagrisparva sp. n.: a = holotypemale, habitus, dorsalview, b = paratypefe- male, habitus, dorsalview

Fig. 5. Bisetocreagrisparva sp. n., holotypemale (Figsa–c, e–h, j–k), paratypefemale (Figsd, i): a = carapace, dorsalview, b = leftchelicera, dorsalview, c = galeaofmale, d = galeaoffe- male, e = rallum, f = rightchela, lateralview, showingtrichobothriotaxyandteeth, g = right pedipalp, dorsalview (trochanter, femurandpatella), h = genitalareaofmale, i = genital areaoffemale, j = rightlegI, lateralview, k = rightlegIV, lateralview. Scalebars: 0.02 mm

(c–e); 0.10 mm (h, i); 0.20 mm (a, b, f, g, j, k)

Abdomen – Tergitesandsterniteswithuniseriatesetation, tergalchaetotaxy (I–X): 9–11: 10–11: 10–11: 11–12: 11: 11–12: 11–12: 11: 11: 10–11, sternal chaetotaxy (IV–X): 8–9: 11–12: 13–14: 13: 13–14: 12–13: 11. Femalegenitalarea (Figs 5i, 6f): sterniteIIwith 4–5 setae oneachside; sterniteIIIwitharowof 7–8 setaeontheposteriormargin.

Measurements (length/breadthordepthinmm) – Male. Bodylength 1.53–1.61. Cara- pace 0.39–0.42×0.32–0.34 (1.22–1.24). Chelicera 0.22–0.23×0.12 (1.83–1.91), movablefinger Fig. 6. Bisetocreagrisparva sp. n., holotypemale (Figsa–e, g, h), paratypefemale (Fig. f): a = carapace, dorsalview, b = rightpedipalp, dorsalview, c = rightchela, lateralview, d = left chelicera, dorsalview, e = genitalareaofmale, f = genitalareaoffemale; g = rightlegI,

lateralview, h = rightlegIV, lateralview

length 0.16–0.17. Pedipalpaltrochanter 0.19–0.21×0.11 (1.73–1.91), femur 0.35×0.14 (2.50), patella 0.33×0.15–0.16 (2.06–2.20), chela (withpedicel) 0.59–0.62×0.17–0.19 (3.26–3.47), chela (withoutpedicel) 0.54–0.58×0.17–0.19 (3.05–3.18), handlength (withoutpedicel) 0.23, movablefingerlength 0.34–0.36 (1.48–1.57×hand). LegI: trochanter 0.08×0.06 (1.33), femur 0.14– 0.16×0.07 (2.00–2.29), patella 0.11–0.12×0.06 (1.83–2.00), tibia 0.15–0.16×0.05 (3.00–3.20), ba- sitarsus 0.07–0.08×0.04 (1.75–2.00), telotarsus 0.11–0.12×0.04 (2.75–3.00). LegIV: trochanter 0.12–0.13×0.09 (1.33–1.44), femur + patella 0.29–0.33×0.13 (2.23–2.54), tibia 0.26–0.27×0.07 (3.71–3.86), basitarsus 0.09×0.05–0.06 (1.50–1.86), telotarsus 0.15×0.05 (3.00).

Female – Bodylength 1.61–1.82. Carapace 0.42×0.35–0.36 (1.17–1.2). Chelicera: 0.25– 0.26×0.13 (1.92–2.00), movablefingerlength 0.18–0.19. Pedipalpaltrochanter 0.18–0.20×0.12 (1.50–1.67), femur 0.36–0.39×0.15–0.16 (2.40–2.44), patella 0.33–0.36×0.16–0.17 (2.06–2.12), chela (withpedicel) 0.64–0.68×0.20–0.22 (3.09–3.20), chela (withoutpedicel) 0.59–0.62×0.20– 0.22 (2.82–2.95), handlength (withoutpedicel) 0.28–0.30, movablefingerlength 0.35–0.36 (1.20–1.29×hand). LegI: trochanter 0.08–0.09×0.06 (1.33–1.50), femur 0.16×0.07 (2.29), patella 0.12–0.13×0.06–0.07 (1.86–2.00), tibia 0.14–0.16×0.05 (2.80–3.20), basitarsus 0.07–0.08×0.04 (1.75–2.00), telotarsus 0.12–0.13×0.03–0.04 (3.25–4.00). LegIV: trochanter 0.13×0.10 (1.30), femur + patella 0.24–0.29×0.10–0.12 (2.40–2.42), tibia 0.21–0.24×0.06–0.07 (3.43–3.50), basi- tarsus 0.08×0.05 (1.60), telotarsus 0.13–0.14×0.04–0.05 (2.80–3.25).

Distribution – China (Zhejiang).

Remarks – Thisnewspecieshasasmallbodyandismostlypaleyellow, appearingtobeimmature. Aftercarefulexamination, wefoundallspecimens had 12 trichobothriaonpedipalpalchelaandthemaleshadsclerotizedgeni- talia. Thisspeciescanbeeasilyseparatedfromtheotherthreesmallspecies, B. philippinensis ( Beier, 1931) , B. nankingensis and B. thailandica , by the followingcharacters: rallumwith 7 blades (rallumwith 8–9 bladesintheotherthree species), apexofcoxawith 3 setae (apexofcoxawith 4 setaein B. philippinensis , 4–5 setaein B. nankingensis and B. thailandica ), pedipalpalfemur, patella andchelawithgranulations (femur, patellaandchelasmoothin B. nankingensis , patellaandchelasmoothin B. thailandica ), sturdypedipalpalfemur (whichin B. philippinensis and B. nankingensis ismoreslender, B. philippinensis pedipalpalfemur 3.4–3.5 vs 2.5 timeslongerthanbroadinmale, B. nankingensis pedipalpalfemur 3.90 vs 2.40–2.44 timeslongerthanbroadinfemale), and itstinysize (lengthofpedipalpalfemuratmost 0.39 mm vs atleast 0.46 mm in thailandica and philippinensis and 0.82 mm in nankingensis ).

B. parva wascollectedinthelitterandsoilinabamboogrove. Theenvi- ronmentwassomewhatdry, andthelitterwasalittlethinnerthaninother habitats. Itispossiblethatthesmallsizeofthisspeciesiscausedbythehabi- tat, butfurtherstudyisrequiredtoprovethisassumption.