Microzercon alaskaensis, Ujvári, 2013

Ujvári, Zs., 2013, Review Of The Nearctic Genera Macrozercon Błaszak, 1976 And Microzercon Błaszak, 1976 (Mesostigmata: Zerconidae), Acta Zoologica Academiae Scientiarum Hungaricae 59 (4), pp. 347-389 : 370-373

Microzercon alaskaensis sp. n.

( Figs 49 –54)

Type material. Holotype: female – USA, Alaska, Semidi Island , 25.08.1980, leg. Hatch, M. A. (slideCNCAZ0378) . Paratypes: localityanddateasfortheholotype (slideCNCAZ0376 – 1 male; slide CNCAZ 0377 – 1 male) ; USA, Alaska, Aleutians, Amchitka Island , 09.1976 (slideCNCAZ0365 – 1 maleidentifiedearlieras‘ Microzerconcalifornicus ’; slideCNCAZ0366 – 1 maleidentifiedearlieras‘ Microzerconcalifornicus ’) ; USA, Alaska, BuldirIsland , Elev. 10 m. Slope 25 o. Aspect 40 o A2, Calamagrostisutkaensis , Carex , BaseQ, Hillsidefacingalluvialvalley , 03.09.1976 (slideCNCAZ0367 – 1 femaleidentifiedearlieras‘ Microzerconcalifornicus ’; slide CNCAZ0368 – 1 maleidentifiedearlieras‘ Microzerconcalifornicus ’) .

Diagnosis of female. Setae j2 and z3 smooth and needle-like, as well as othercentralandsubmarginalsetaeofpodonotum. Eachmarginalsetasimi- larinappearance, denselypilose, brush-like. OpisthonotalJ-setaefinelyser- rateproximally, pointed, othercentralandsubmarginalsetaeofopisthonotum smooth, needle-like. Glands Po 2 in position gdS2, on line S2 and S3, Po3 absent. Anteriorsurfaceofpodonotalshieldcoveredbyscalespossessinglacy posteriormargin. Surfaceofopisthonotumsmooth. Posterodorsalcavities unifrom, weaklydeveloped. Posterolateraltipsofperitrematalshieldsfused withventrianalshieldonlevelofsetaeR2.

Descriptionoffemale. Lengthofidiosoma: 330 μm (328–333 μm); width: 315 μm (312–317 μm) (n = 2).

Dorsal side ( Fig. 49 ). Podonotum with 20 pairs of setae, j1–6, z2–6, s1–6, r2 and r4–5 inserteddorsally, r1 andr3 insertedventrally, onperitrematalshields. Setaej1, s2, r2, s3, r4–5 ands6 moderatelylong, brush-like, denselypilose. Otherpodonotalsetaeshort, smooth and needle-like. Setae s5 situated on level of z5. Glands gds1 (po1) situated medial toinsertionsofs1; gdj4 (po2) situatedabovelineconnectingj4 andz4, nearz4; gds4 (po3) onlineconnectings4 ands5, nears5. Anteriorsurfaceofpodonotalshieldcoveredby scalespossessinglacyposteriormargin, asmallareaoftheposterocentralsurfacewithout ornamentation.

Opisthonotumwith 22 pairsofsetae: J1–5, Z1–5 andS1–5, marginalR-serieswith sevenpairsofsetae. SetaeJ1–5 finelyserrateproximally, pointed. SetaeJ2 reachinginser- tionsofJ3, otherJ-setaenotreachingbasesofthefollowingoneoftheseries. SetaeJ5 situatedonlevelofcentraldorsalcavities. SetaeZ1–4 andS2–5 similarinappearance, smooth, pointed, needle-like. SetaeJ1–5 andZ1–4 constitutenearlyparallellines. SetaeZ4 situated on line connecting Z3 and S5. Setae S2 situated anterior to S3. Setae Z5, S1 and R1–6 brushlike, denselypilose, R7 somewhatshorterthanprevioussetae, bent, pointed, pilose. None ofS-setaereachingbeyondmarginsofopisthonotum. Lengthofopisthonotalsetaeand distancesbetweentheirinsertionsasinTable 6. Glands gdZ1 (Po1) situatedlateraltoinser- tions of Z1; gdS2 (Po2) situated on line connecting S2 and S3, near S3; glands Po3 absent; gdS5 (Po4) onlineconnectingJv5 andS5, equidistantly. Marginalserrationdeep, obtuse. Opisthonotalsurfacewithoutornamentation. Posterodorsalcavitiesuniform, multangular, weaklydeveloped. Lateralpairofcavitiessituatedanteriortocentralpair, betweeninser- tions of J5 and Z4.

Ventralside ( Fig. 50 ). Peritrematalandventrianalshieldsfusedwithbodymargins. Posterolateraltipsofperitrematalshieldsfusedwithlateralpartsofventrianalshieldon levelofsetaeR2. Peritrematalshieldsornamentedbyfinereticulationoflongitudinalsutures. Peritremesfinelycurved, withasmalldilationnearstigmata. Peritrematalsetaer1 short, smoothandneedle-like, setaer3 short, finelypilose, pointed. Tritosternumwithtwo slender, apicallybifurcate, marginallypiloselaciniae, tritosternalbasevase-like. Sternal shield 48 μmlongand 43 μmwideatthelevelofsetaest2, withslightlyarcuateposteriormargin, withinconspicuousreticulate ornamentation. Sternalsetaesmoothand needle-like. Glands gv1 situatedmedial tosetaest3. Genitalshieldtypicalforthe family, withafewsutures, genitalsetae smooth and needle-like. Glands gv2 present, withdoubleopeningssurroundedbysmalladgenitalsclerites. Ventrianal shieldwithsmoothandneedle-likesetae, setaeZv1 absent. Adanalsetae, Jv4 and postanalseta 1.5–2 timeslongerthanother preanalsetae. SetaeJv5 moderatelylong, brush-like, denselypilose. Analvalves withvestigialeuanalsetae. Glands gv3 situatedlateralorslightlyposterolateral toadanalsetae. Anteriorsurfaceofventri- analshieldcoveredbytile-likepatternto levelofJv3–Zv4.

Gnathosoma. Situationofhypos- tomalandsubcapitularsetaetypicalfor the family. Setae h1 elongate, apically tapering, smooth. Setaeh2 shorterthanh1, h3 shorter than h2, each smooth. Setae h4 slightlylongerthanh2, proximallyserrate. Corniculihorn-like, internalmalaewitha pairofbifurcateanterocentralbranches andwithserratemargins. Cheliceraerela- tivelyslender, fixeddigitwith 5–6 teeth, movabledigitwith 4–5 teeth. Epistomeof Prozercon - type.

Descriptionofmale ( Fig. 51 ). Length of idiosoma: 265 μm (258–274 μm); width: Figs 52–54. Microzercon alaskaensis sp. n. male: 243 μm (231–269 μm) (n = 5). Chaetotaxy, 52–53 = chelicerae, 54 = epistome.

adenotaxyandsculpturalpatternofdorsal, ventrianalandperitrematalshieldssimilarto thoseoffemale. Lengthofopisthonotalsetaeanddistancesbetweentheirinsertionsasin Table 6. Peritrematalshieldsfusedwithanterolateralpartsofventrianalshield, onlyapair ofhorizontalincisionscanbeobservedrunningtowardssetaeR2. Sternigenitalshielddi- vided, theanteriorpartbearingsetaest1, thecentralpartpossessthegenitalopeningand generally has three pairs of smooth and needle-like setae, setae st4 may be absent. A small, subtriangularposteriorsternigenitalscleritesituatedbetweencoxaeIV, withoutsetae, setaest5 alwaysabsent. Sternalsetaest3 situatedonlevelofcentralpartofgenitalopening. Glands gv2 withasingleopening, surroundedbytinyadgenitalsclerites. Eachcharacters ofgnathosomasimilartothoseoffemale (Fig. 54), butterminalpartoffixeddigitofcheli- ceraebifurcate (Figs 52–53).

Etymology. The new species is named after Alaska, the state where it was collected.

Remarks. Theknown Microzercon speciescanbedistinguishedaccording tokeypresentedbelow.

Figures

Figs 49–51. Microzercon alaskaensis sp. n.: 49 = dorsal view, female, 50 = ventral view, female, 51 = ventral view, male.