Microzercon Błaszak, 1976

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 : 359-360

Microzercon Błaszak, 1976

Microzercon BŁaSzak, 1976: 565 , 567; HalaškoVÁ 1977: 69; 1978: 853; 1979: 101, 103; 1980: 547; 1984: 600; BŁaSzak et al. 1995: 254; SIkoRa & SkoRackI: 2008: 253; DÍaz- AguIlaR & UJVÁRI 2010: 26.

Bakeras BŁaSzak, 1984: 588; BŁaSzak et al. 1995: 257; SIkoRa & SkoRackI: 2008: 254; DÍaz- AguIlaR & UJVÁRI, 2010: 26. syn. n.

Blaszakiella SIkoRa & SkoRackI, 2008: 251; DÍaz- AguIlaR & UJVÁRI 2010: 26. syn. n.

Paleozercon BŁaSzak etal., 1995: 253; SIkoRa & SkoRackI 2008: 254; DÍaz- AguIlaR & UJVÁRI 2010: 26. syn. n.

Typespecies: Prozerconcalifornicus SellnIck, 1958 a: 126, byoriginaldesignation.

Diagnosis. Idiosomawide, oval. Onlyanarrowslitcanbeobservedbetweenperitrematalshieldsanddorsalshields, ortheseshieldsarefusedwith eachother. Posterolateraltipsofperitrematalshieldsexpandedposteriorly, oftenfusedwithventrianalshield. Peritremesofgeneralsize, expandedtoanteriorhalfofcoxaeIII, straightorslightlybent. Setaer1 andr3 shiftedventrallytoperitrematalshields, bothshort, bristle-like, usuallysmooth. Glandsgv2 present, theiropeningssurroundedbysmalladgenitalsclerites. Ventrianal shieldbearing 19 or 21 setae, setaeZv1 usuallyabsent. Glandsgv3 situated anterolateraltoadanalsetae. Setaez1 absent. Thirdpairofopisthonotalpores associatedwiththeJ-series (inposition gdJ2 or gdJ3). Marginofopisthonotum with 7 pairsofR-setae. SetaeS1 andmost (anterior) R-setaerelativelylong, denselypilose. Posterodorsalcavitiesheterogenousinsizeanddevelopment.

Remarks. Redifiningthedisgnosisof Micorzercon accordingtothepreviousobservationsofUJVÁRI (2011 b, c, 2013) onderivativecharactersuseful forgenericclassificationresultedinrecognisingseveraljuniorsysnonimous names as follows.

Thegenus Bakeras wasestablishedwithoutcomparisonto Microzercon , whileallmaincharactersofthesetwogeneraarecorresponding. ThereforeI proposeherethat Bakeras isajuniorsynonymof Microzercon , whichresultsin a new combination: Microzercon opiparus ( Błaszak, 1984) comb. n.

In the meantime, the genus Blaszakiella was established on the basis of thepresenceofadgenitalplates. Both Microzercon and Blaszakiella possessthe characteristicadgenitalglands gv2, butithasveryminorimportancewhether theseglandsaresorroundedbyasmall, sclerotizedareaornot, assomany transitionalformswereobservedonthenewlydiscoveredspeciespresented herein. Thus Blaszakiella isajuniorsynonymof Microzercon , whichresultsina newcombination: Microzerconamericanus (SikoraetSkoracki, 2008) comb. n.

Accordingtothedescriptionandreconstructedfiguresofthefossilegenus Paleozercon ithasalsoturnedoutthatthereisonlyaminordistinctive featurebetweenitand Microzercon . In Paleozercon , posterolateraltipsofperi- trematalshieldsendfreely, whilethesearefusedwiththeventrianalshield inthesofarknown Microzercon species. However, asitisdescribedbelow, somespecies, e.g. Microzerconopiparus ( Błaszak, 1984) comb. n., mayshow bothcharacterstagesregardingthesituationofperitrematalshieldtips, thus itcannotbeconsideredasamajordistinctivefeatureofgenera. Itherefore proposethat Paleozercon isajuniorsynonymof Microzercon , whichresultsina new combination: Microzercon cavernicolus ( Błaszak et al., 1995) comb. n.