Lechytia yulongensis Zhang &amp; Zhang 2014, sp. n.
Creators: name: Zhang, Fubin
name: Zhang, Feng
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Pseudoscorpiones
Chthoniidae
Lechytia
Lechytia yulongensis

description: Lechytiayulongensis sp. n. (Figs 1–4) Typematerial. Holotypemale (Ps.- MHBU-YN12080301): China, YunnanProvince, YulongCounty, JadeDragonSnowMountains, Maoniuping (27°08′N, 100°13′E), alt. 3254 m, 3 August 2012, AkiNakamuraleg. Paratypes: twomales (Ps.- MHBU-YN12080302-03), samedataasforholotype. Etymology. Thespecificnamereferstothetypelocality. Diagnosis. Thisnewspeciesischaracterizedbythefollowingcombina- tionofcharacters: carapacewithtwoindistincteyespots, theanteriormargin finelydenticulate; marginalteethofchelalfingerswelldevelopedanddistinctlyretrorse; malewithwell-developedspinneretonmovablefingerofchelicera; bothapicalsetaeofpalpalcoxasimpleattip (<i>hoffi</i> species-group); eleventh sterniteapparentlyreduced; chela 3.55–3.59 timeslongerthanbroad; palpalfe- mur 4.00 timeslongerthanbroad; movablefinger 1.36–1.37 timeslongerthan hand; trichobothria <i>b</i> and <i>sb</i> onlyaboutoneareolardiameterapart. Description. Male – Chelicera, carapace, legsandabdomenyellowish- brown; palp lightbrown (Fig. 1). Carapace (Figs. 2a, 4b): subquadrate, somewhatlongerthanbroad, constrictedan- teriorly; surfacewithfine, anastomosing, transversestriations; noepistomepresent, but anteriormarginslightlyconvexandwith 10–11 distinctdenticles; posteriorpartwithsquamoussculpturing; withtwoindistincteyespots, eachalmostoneoculardiameterfrom anteriormargin; carapacalchaetotaxy: 6–2, (18),thepre- ocularsetashorterthanothersin anteriorrow. Coxalarea (Figs 3a, 4f): coxaIwithalow, triangularapicalprojection; twolongsetae attipofmanducatoryprocess, setaeP 2+3, I 7, II 5, III 6, IV 7, allsetaeacuminate, including apicalsetaeofpalpalcoxa; nocoxalspines; nointercoxaltubercle. Chelicera (Figs 2b, 4c): about 0.60–0.70 aslongascarapace; palmwith 5 setae, of whichashortonelocatedlaterally; galealsetalocatedatmiddleofmovablefinger; fixed fingerwithonelargetooth, andthreeroughenedridgesproximally; movablefingerwith anacuteapicaltoothand 3 pointed, conspicuousmiddleteeth; movablefingerwithadis- tinctspinnerethump. Rallumconsistingof 8 blades, thesubdistalbladestronglyrecumbent, othersstraight (Fig. 3d). Palp (Figs 2c–2f, 3b, 4a): chelarobust; trochanter 1.60–1.80, femur 4.00, patella 1.77– 1.83 andchela 3.55–3.59 timeslongerthanbroad; chelalhand 1.56–1.59 timeslongerthan broad; movablechelalfinger 1.36–1.37 timeslongerthanhand; chelalfingercurvedindorsalview. Fixedfingerwith 41–43 pointed, retrorseteeth, movablefingerwith 35 retrorse teeth, depressedbasally; fixedfingerwithasmallaccessorytoothoninnersideaboutat levelofsecondmarginaltooth. Trichobothria: <i>ib</i>, <i>isb</i>, <i>eb</i> and <i>esb</i> ondorsumofhand, <i>ib</i> and <i>isb</i> situatedbasally, <i>eb</i> and <i>esb</i> situatedmedially; fixedfingerwithfour (<i>et</i>, <i>it</i>, <i>est</i> and <i>ist</i>), plustwospecialsensoryhairs (<i>dx</i>) present, locatednearthetipoffixedfinger; movable fingerwithfour (<i>t</i>, <i>b</i>, <i>sb</i>, <i>st</i>), <i>b</i> situatedslightlycloserto <i>sb</i> thanto <i>t</i>; <i>b</i> and <i>sb</i> onlyaboutone areolardiameterapart; sensillaabsent. Abdomen (Figs 3c, 4g) ovate, tergitesandsternitesundivided, eleventhsternite greatlyreduced, onlyanarrow, thinmembraneexistingbetweententhsterniteandventral analplate. Tergalchaetotaxy: 4–5: 4–5: 6: 6: 6: 6: 6: 6: 6: 4: T2T: 0; sternalchaetotaxy: 8–9: (3)29–33(3): (3)8(3): 12: 10: 10: 10: 8: 2TT2: –: 2; lateralmostonesonanteriortergitesand smallerthanthosemedially, andlateraltwooneachtergitesetclosetogether; anterior genitaloperculumwith 8–9 setae, genitalopeningslit-likeinbasalhalf, eachsidewith 10–12 marginalsetae, anteriorsetaeborderinggenitalopeningacuminate, posteriorones bifurcate. LegsI (Figs 2g, 4d) andIV (Figs 2h, 4e); robust, surfacesnearlysmooth; legIfemur 3.17–3.50 timeslongerthandeep, legIVfemur+patella 2.31–2.33 timeslongerthandeep. Tarsiwithtwoelongateopeningsalongdorsalsurfaceeachwithcrenulatemargins. Measurements (length/breadthordepth, inmm, ratiosinparentheses). Male (holotypeandparatypes). Bodylength 1.38–1.44. Carapace 0.37–0.40×0.35–0.37 (1.06–1.08). Chelicera 0.24–0.26×0.13 (1.85–2.00), movablefingerlength 0.12–0.13. Palpaltrochanter 0.16–0.18×0.10 (1.60–1.80), femur 0.40×0.10 (4.00), patella 0.22–0.23×0.12–0.13 (1.77–1.83), chela 0.61–0.64×0.17–0.18 (3.55–3.59), hand 0.27–0.28×0.17–0.18 (1.56–1.59), movablefinger length 0.37–0.38 (1.36–1.37×hand). LegItrochanter 0.10–0.11×0.08 (1.25–1.38), femur 0.19– 0.21×0.06 (3.17–3.50), patella 0.11×0.05–0.06 (1.83–2.20), tibia 0.12–0.14×0.04–0.05 (2.40–2.80), tarsus 0.24×0.03 (8.00); legIVtrochanter 0.15×0.09 (1.67), femur+patella 0.35–0.37×0.15–0.16 (2.31–2.33), tibia 0.25–0.27×0.07 (3.57–3.86), metatarsus 0.13–0.14×0.05–0.06 (2.33–2.60), te- lotarsus 0.19–0.21×0.03 (6.33–7.00). Distribution. China (YunnanProvince). Remarks. Becauseoffewcollections, <i>Lechytia</i> specieshaverarelybeen studiedinrecentyearsandlittleisknownabouttherelationshipsbetween them. However, twodistinctspecies-groupscanberecognizedinthisgenus (MUcHmorE 1975, 2000, JUdsoN 1992), the <i>L. arborea</i> species-groupandthe <i>L.</i> <i>hoffi</i> species-group. The <i>L. arborea</i> species-grouphasthefollowingcharacters: (1) apicalsetaeofpalpalcoxabifurcate; (2) eleventhtergitewithchaetotaxy 1T2T1; (3) spinneretofmaleabsentorindistinct; (4) mostteethofchelalre- duced. The <i>L. hoffi</i> species-groupisdiagnosedbyhaving: (1) apicalsetaeof palpalcoxasimple, acuminate; (2) eleventhtergitewithchaetotaxyT2T; (3) malewithspinneretnearlyaswelldevelopedasinfemale; (4) chelalteeth welldeveloped, mostlycusped. Basedonthesecriteria, <i>L. yulongensis</i> sp. n. caneasilybeassignedtothe <i>L. hoffi</i> species-group. Five <i>Lechytia</i> specieshadpreviouslybeenrecordedfromAsia: <i>L. madrasica</i> Sivaraman, 1980, <i>L. indica</i> Murthy &amp; Ananthakrishnan, 1977 fromIndia, <i>L. sakagamii</i> Morikawa, 1952 fromJapan, <i>L. himalayana</i> Beier, 1974 fromNepal and <i>L. asiatica</i> Redikorzev, 1938 fromVietnam. Thenewspeciesdiffersfrom <i>L. madrasica</i> and <i>L. indica</i> bythepresenceofeyespotsoncarapace, whichare lacking in <i>L. madrasica</i> and <i>L. indica.</i> It can be separated from <i>L. sakagamii</i> by themalemovablefingerwithadistinctspinnerethump (absentinmaleof <i>L. sakagamii</i>) andbytrichobothria <i>b</i> and <i>sb</i> onlyaboutoneareolardiameterapart (<i>b</i> and <i>sb</i> closetogether, onlyabouthalfanareolardiameterapartin <i>L. sakagamii</i>). <i>L. himalayana</i> isdistinguishedfromthenewspeciesbytheratioofmovablefingerlongerthanhand (1.20× <i>vs</i> 1.36–1.37×), andbypossessingamuch longercarapace (1.25 timesaslongasbroad, comparedwith 1.06–1.08 times in <i>L. yulongensis</i> sp. n.). <i>L. asiatica</i> differsfromthenewspeciesbyitssmaller size (palpalfemur 0.3 mm <i>vs</i> 0.40 mm, chela 0.20 mm <i>vs</i> 0.27–0.28 mm), and its relativelyshortermovablechelalfinger (1.10× <i>vs</i> 1.36–1.37× hand). Thenewspeciesresembles <i>L. hoffi</i> Muchmore, 1975 fromAmerica, both inhavingaspinnerethumpinthemaleandthechelalteethwell-developed, but <i>L. hoffi</i> differsfrom <i>L. yulongensis</i> sp. n. inhavingtwocorneateeyes (re- ducedto eye spots in <i>L. yulongensis</i> sp. n.) andchelal (3.55–3.59 <i>vs</i> 3.90–4.10) timeslongerthanhand; furthermore, theformofteethonthemovablechelal fingerisdifferent (with 35 retrorseteeth, depressedbasally), asopposedto 8–12 small, triangularteethatdistalend, followedby 19–24 long, lowteeth, nearlyallwithcuspsin <i>L. hoffi</i>). Thenewspeciesalsoresembles <i>L. kuscheli</i> Beier, 1957 fromChileinhavingtheapicalsetaofthepalpalcoxasimple, but itdiffersfromthelatterinhavingamuchmorerobustchela (3.55–3.59 times longerthanbroad, asopposedto 4.8 timesin <i>L. kuscheli</i>). Consideringbiogeographicaldistribution, both <i>L. yulongensis</i> sp. n. and <i>L. hoffi</i> couldbecollectednearbytheTropicofCancer, andoccurredatrela- tivelyhighelevations. As <i>L. hoffi</i> hasbeenrecordedfromawideareainthe westernUnitedStates, wepresume <i>L. yulongensis</i> sp. n. maybehaveawide- spreaddistributioninChina (orAsia). MembersoffamilyLechytiidaearedistributedworldwidewitheleven speciesrecordedfromSouthandNorthAmerica, sixspeciesfromAfrica, one speciesfromTurkey, onespeciesfromAustralia, andfivespeciesfromAsia andthePacificregion (HArvEy 2013). <i>L. yulongensis</i> sp. n. isthefirstmember ofthefamilyLechytiidaetobediscoveredinChina; twomalespecimenswere collectedfromconiferforestsusingthebarksprayingmethod, andonemale specimenwascollectedfromconiferforestsusingBerleseextraction. There- forewepresume <i>L. yulongensis</i> sp. n. maybeacorticolousspecies, oritlivesin thesoil, orinbothconditions. <b>*</b> <i>Acknowledgements</i> – WeexpressoursincerethankstoDr. MarkS. Harveyforprovidingsomeliterature. WearegratefultoAkiNakamuraforcollectingthespecimens. Dr. J. MacDermottkindlyhelpedreviewingtheoriginalEnglishmanuscript. Thisworkwas supportedbytheNationalNaturalScienceFoundationofChina (No. 31372154, 31093430), andinpartbyagrantoftheProgramofMinistryofScienceandTechnologyofRepublicof China (2012 FY110803) to Dr. Feng Zhang.
description: Published as part of <i>Zhang, Fubin &amp; Zhang, Feng, 2014, First Report Of The Family Lechytiidae (Arachnida: Pseudoscorpiones) From China, With The Description Of A New Species, pp. 217-225 in Acta Zoologica Academiae Scientiarum Hungaricae 60 (3)</i> on pages 218-224
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