Macrozercon washingtonicus, 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 : 354-359

Macrozercon washingtonicus sp. n.

( Figs 15–26 )

Type material. Holotype: female – USA, Washington, Wenatchee county, Pinetum , small pond, leaf litter, 18.09.1978, leg. Jermy, T. ( HNHM E-Am-080) . Paratypes: 7 females, 5 males, 1 deutonymph – locality and date as for the holotype ( HNHM E-Am-080) .

Diagnosisoffemale. Mostcentralandsubmarginalpodonotalsetae smoothorfinelyserrate. MarginalsetaeS1 andR1–2 elongate, brush-like, R3–7 short, smooth, bristle-like. GlandsPo2 situatedinposition gdS2, online connectingS2 andS3, Po3 situatedinposition gdJ3, posterolateraltoJ3. Anterocentralandlateralsurfaceofpodonotumcoveredbyscalespossessing lacyposteriormargin. Peritremesnearlystraight, withasmalldilationnear stigmata.

Descriptionoffemale. Lengthofidiosoma: 462 μm (451–483 μm); width: 376 μm (355–398 μm) (n = 8).

Dorsal side ( Fig. 15 ). Podonotum with 20 pairs of setae, j1–6, z2–6, s1–6, r2 and r4–5 inserteddorsally, r1 andr3 insertedventrally, onperitrematalshields. Setaej1, z3, r2, s3, r4–5 ands6 elongate, brush-like, denselypilose. Setaej2, j6, z6, s2 ands4–5 shorter, finely serrate. Otherpodonotalsetaeshort, smoothandneedle-like. Setaes5 situatednearlevel ofz6. Glands gds1 (po1) situatedmedialoranteromedialtoinsertionsofs1; gdj4 (po2) situated on line connecting j4 and z4, near z4; gds4 (po3) on line connecting s4 and s5. Anterocentralandlateralsurfaceofpodonotalshieldcoveredbyscalespossessinglacyposterior margin, posterocentralpodonotalsurfacesmooth.

Opisthonotumwith 22 pairsofsetae: J1–5, Z1–5 andS1–5, marginalR-serieswith sevenpairsofsetae. SetaeJ1–5, Z1–4 andS2–3 similarinappearance, moderatelylong, pointed, denselypilose ( Fig. 19 ). SetaeJ1–5 andZ1–4 constitutenearlyparallellines. Setae S2 situatedanteriortoS3. SetaeZ5 andS4–5 elongate, apicallybroadening, brush-like. S2–3 notreachingedgesofopisthonotum, S4–5 expandingbeyondthemarginsoftheshield. SetaeS1 andR1–2 similarinappearance, brush-like, longerthantherestofR-setae. R3–7 short, smooth, bristle-like, R3 maybefinelybarbed. Lengthofopisthonotalsetaeanddis- tancesbetweentheirinsertionsasinTable 2. Glands gdZ1 (Po1) situatedanteromedialto insertionsofZ1; gdS2 (Po2) situatedonlineconnectingS2 andS3; gdJ3 (Po3) posterolateral toJ3; gdS5 (Po4) onlineconnectingZ5 andS5, anteriororanteromedialtoinsertionsofJv5. Marginalserrationmoderatelydeep, obtuse. Opisthonotalsurfacesmooth, onlysomeoval musclescarscanbeseenmedialtoZ1–3. Posterodorsalcavitiesuniform, well-sclerotized, saddlelike, withundulateinnermargin. Lateralpairofcavitiessituatedanteriortocentral pair, belowinsertionsofJ5 andZ4, withaxesslightlyconverginganteriorly. Centralpair with axes parallel to that of the body.

of female, 25 = epistome of male, 26 = epistome of deutonymph.

Ventralside ( Fig. 16 ). Slitbetweenperitrematalshieldsanddorsalshieldsnarrow. PeritrematalshieldstruncateonlevelofS1, possessingfinereticulationoflongitudinalsutures. Peritremesnearlystraight, withasmalldilationnearstigmata ( Fig. 20 ). Peritrematal setaer1 short, smoothandbristle-like, r3 abouttwiceaslongasr1, finelyserrate. Tritoster- numwithtwoslender, apicallybifurcate, marginallypiloselaciniae, tritosternalbasevaselike. Sternalshield 76 μmlongand 53 μmwideatthelevelofsetaest2, withfinelycurved posteriormargin, withweaklyconspicuousreticulateornamentation. Sternalsetaesmooth andneedle-like. Glands gv1 situatedposteromedialtosetaest3. Genitalshieldtypicalfor thefamily, withafewsutures, genitalsetaesmoothandneedle-like. Glands gv2 present, withasingleopeningsurroundedbysmalladgenitalsclerites. Ventrianalshieldwide, expandedtoanterolateraldirection, fittingtothemargins, reachingbeyondlevelofposterior edgesofperitrematalshields. Anterioredgeoftheshieldsplitbytwoanterolateral, nearly verticalincisionsexpandingtolevelofsetaeR3–4. Ventrianalshieldwithshort, smooth andneedle-likepreanalandadanalsetae, setaeZv1 absent. Postanalseta 1.5–2 timeslonger thanpreanalandadanalsetae, distallypilose. SetaeZv3 positionedonlevelofZv4. Setae Jv5 moderatelylong, brush-like, pilose. Analvalveswithvestigialeuanalsetae. Glands gv3 situatedlateraltoadanalsetae. Anteriorsurfaceofventrianalshieldcoveredbytile-like patterntolevelofJv3–Zv3–Zv4.

Gnathosoma ( Fig. 22 ). Situationofhypostomalandsubcapitularsetaetypicalforthe family. Setae h1 elongate, apically tapering, smooth. Setae h2-3 shorter than h1, smooth, h4 aslongash2, proximallyserrate. Corniculihorn-like, internalmalaewithapairofbifur- cateanterocentralbranchesandwithserratemargins. Cheliceraemoderatelythick, fixed digitwith 6 teeth, movabledigitwith 4–5 teeth. Epistomeof Prozercon - type ( Figs 23–24 ).

Descriptionofmale ( Figs 17 , 21 ). Lengthofidiosoma: 366 μm (355–376 μm); width: 296 μm (290–306 μm) (n = 5). Chaetotaxy, adenotaxy and sculptural pattern of dorsal, ven- trianalandperitrematalshieldsbasicallysimilartothoseoffemale. Lengthofopisthonotal setaeanddistancesbetweentheirinsertionsasinTable 2. Peritrematalshieldsfusedwith anterolateralpartsofventrianalshield, onlyapairofhorizontalincisionscanbeobserved runningtowardssetaeS1. Peritremesstraight, withoutanydilation. Sternigenitalshield undivided, bearingfourpairsofsmoothandneedle-likesetae, setaest5 absent. Sternalse- taest3 situatedonlevelofanteriorhalfofgenitalopening. Eachcharactersofgnathosoma similartothoseoffemale ( Fig. 25 ), butterminalpartoffixeddigitofcheliceraebifurcate.

Descriptionofdeutonymph ( Fig. 18 ). Lengthofidiosoma: 355 μm; width: 290 μm (n = 1). Dorsalchaetotaxy, adenotaxyandappearanceofposterodorsalcavitiesbasicallysimilarto thoseofadults, exceptpositionofsetaeJ5, whichshiftedposterior, neartheanterolateral edgeofcentraldorsalcavities, thussetaeJ4 notreachinginsertionsofJ5. Furthermore podonotal setae z4 finely serrate. Length of opisthonotal setae and distances between their insertionsasinTable 2. Dorsalornamentationsimilartothatofadults, butlessexpressed. Eachcharactersofgnathosomasimilartothoseofadultfemale ( Fig. 26 ).

Etymology. ThespeciesisnamedafterWashington, thestatewhereitwascollected.

Differentialdiagnosis. Thetwoknown Macrozercon speciescanbedistinguishedaccordingtoTable 3.

Figures

Figs 15–18. Macrozercon washingtonicus sp. n.: 15 = dorsal view of female, 16 = ventral view of female, 17 = ventral view of male, 18 = dorsal view of deutonymph.

Figs 19–26. Macrozercon washingtonicus sp. n.: 19 = setae J4 of female, 20 = peritreme of female, 21 = peritreme of male, 22 = ventral view of gnathosoma, female, 23–24 = epistomes