Two New Micropepline Beetles (Coleoptera, Staphylinidae) from Sichuan Province, Southwest China

9 Pages·2000·9.4 MB·English

by  Watanabe, Y

Elyt1-a,T◆o(kyo,28(1):45-53,May15,2000
TwoNewMicropeplineBeetles(Coleoptera,Staphylinidae)
fromSichuanProvince,SouthwestChina
Yasuaki WATANABE
LaboratoryofInsectResources,TokyoUniversityofAgriculture,
Atsugi,Kanagawa,243-0034Japan
Abstract Twonewmicropeplinebeetlesaredescribedandillustratedunderthe
namesMuenoiandMnomurat.Theywereobtainedbysiftingdeadleavesorthelitterac-
cumulatedinwarmtemperateforestsonthemountains inSichuanProvince,Southwest
China.
ThegenusMlcropeplusisapeculiargroupamongstaphylinidbeetlesfor therea-
sonthat thenine-segmentedantennaewiththeapicalmostsegment enlargedintoan
ovalclubandthedeeprecessesontheundersurfaceoflateralareasofpronotumfor
theirreception,andtheelytraandabdomenprovidedwithstrongly raisedcarinaeon
thesurface.
Uptothepresent,fivespeciesofthegenusMicropeplushavebeenknown from
theContinentalChina.ThreeofthemwerereportedbyWATANABEandLUo(1991,pp.
93,94),andYANG(1995,p 218) fromZhejiangProvinceinEastChina,andthere-
mainingtwobyWATANABE(1995,p245)andWATANABEandXIAo(1996,P.1) from
YunnanProvinceinSouthwestChina.
Duringtheinvestigationofsoil-livingbeetlesofSichuanProvincemadein1996,
twospeciesofthegenusMlcropepluswereobtainedbysiftingdeadleavesorthelitter
onMt.ErlangShanoftheJiaJinShanMountainsandMt.JiudingShanoftheChaping
ShanMountainsinSichuanProvincebyDr.S.NoMURAandMr.L.ZHAo.Theyseem
tobelongtothegroupofMicr〔)peplusfulvusforreasonofthemediallymucronate
head.Afteracarefulexamination,itbecomesclearthat thesespeciesarenewtoSci-
encebecauseofdifferentconfigurationofmalegenitalorganfromthoseoftheknown
membersofthespecies-group.Theywillbedescribedinthepresentpaper.
Beforegojngfurther,IwouldliketoexpressmysinceregratitudetoDr.Shun-lobi
UENo,visitingProfessoratTokyoUniversityofAgriculture,forhiskindadviceonthe
presentstudy.MythanksarealsoduetoDr.ShuheiNoMURA,NationalScienceMu-
seum(Nat.Hist),Tokyo,andMr.ZHAoLijun,anex-memberoftheShanghaiInstitute
ofEntomology,AcademiaSinica,fortheirkindnessingivingmethevaluablemate「l-
atsusedinthestudyandinformationonthebionomica1data.
46 YasuakiWATANABE
Micropeplusue'leiY.WATANABE,sp nov
(Figs.1-6)
Body length: 2.2-2.3mm(fromfrontmarginofheadtoanalend);1.4-1.5mm
(fromfrontmarginofheadtoelytra1apices).
Bodyellipticalandconvex. Colourblackishbrowntobrownishred,subopaque
except forshiningabdomen,withantennae,bothsidesofpronotumandlegsbrownish
yellow.
Male. Headsubtriangular,distinctlybroaderacrosscompoundeyesthan length
(width/length=1.17); clypeo-fronta1areastrongly narrowedanteriadandmucronate
medially,stronglydepressedabove,surfaceofthedepressionnearly attened and im-
punctatethoughcoveredwithdistinctcoriaceousgroundsculpture;discprovidedwith
apairofweeksinuatecarinae,surfacesimilar toclypeo-fronta1area;eachsideofthe
middlejustbeforebaseprovidedwithasmall fovea;lateralsidessinuateandfinelyel-
evated;compoundeyesprominentandcoarselyfaceted.Antennaerelativelyshort,not
reachingthemiddleofpronotum,usuallyrecedingontotheundersideofpronotumfor
theirreception,allthesegmentspolishedexcept for1stand9thsegments;1stsegment
stout andsubopaque,widestat themiddleandnarrowedtowardsbothanteriadand
posteriad,distinctlylongerthanbroad(length/width=1.17),2ndabruptlynarrowedin
Fig. 1. Mic'-opep/lls lie,101 Y WATA-
NABE, sp nov., fromMt.Erlang
,
ShanoftheJiajinShanMts.,inLud-
ing Xian of Sichuan Prov., Sw
China.Scale:0.5mm.
NewMicropepIinesf・lomSichuan 47
Fig.2. HeadofMicl-lopp/usueno1Y.
WATANABE,sp nov., .Scale: 0.25
mm.
apicalthir about1.4timesas longasbroa butmuchshorter (2nd/1st=0.80) and
distinctlynarrower(2nd/1st=0.67) than1st,3rdto5thequal inwidthtooneanother,
3rdabout l5timesaslongasbroadbutconsiderablyshorter(3rd/2nd=0.71)andnar-
rower (3rd/2nd=0.65) than2n 4tha littlelonger thanbroad (length/width=1.38)
thoughsomewhatshorter than3rd(4th/3rd=0.90),5thsomewhat longer thanbroad
(length/width=1.15)thoughslightlyshorterthan4th(5th/4th=0.83),6thto8thequal
inwidthtooneanother,6thaslongasbroadthoughdistinctlyshorter(6th/5th=0.80)
andslightlynarrower(6th/5th=0.92) than5th,7thand8thalmostequal inbothlength
andwidth,eachalittletransverse (width/length=1.20) andalittleshorter than6th
(eachof7thand8th/6th=0.83),9ththelargestandmoreor lessglobular,setoseinapi-
cal thir distinctly longerthanbroad(length/width=1.32),5timesaslongasandre-
markablybroaderthan(9th/8th=3.17)8th,narrowlyroundedattheapex.
Pronotumsubtrapezoida1andstronglyconvexinthemedianpart,about twiceas
broadaslong,anddistinctlylonger(pronotum/head=1.36)andmuchbroader(prono-
tum/head=1.70)thanhead,widestatbase,morestronglynarrowedanteriadinanterior
halfthan inposteriorhalf, lateralmarginseach feeblyarcuateinposteriorhalfand
straight inanteriorhalf,anteriormarginbroadlyemarginateatthemiddlethoughal-
moststraightinthemiddle,posteriormarginbisinuate,evidentlyandbroadlyproduced
posteriadat themiddle,anterior anglesmoderatelyproducedanteriadandbluntly
roundedatthecorners,posterioronesnearlyrectangularandclearlyangulateat the
corners; lateralareaseachbroadlyexplanateandprovidedwithashallowdepression
bothbeforeandbehind themiddle;surface impunctate, thoughcoveredwith finer
groundsculpturethanthatonhead;medianareaprovidedwitheightcellsenclosedby
costae, four inmedianareaandtwoateachlateralside,thoughthelatter aresome-
times obscure,surface ofeach cell distinctly depresse and coveredwithground
sculptureasinlateralareas.Scutellumlingulate,somewhatbroaderthanlong(width/
length=1.29),withapparentlycoriaceousgroundsculptureonthesurface.Elytrasub-
quadrateand a little dilated posteriad, convex medially and distinctly transverse
(wjdth/1ength=1.36), considerably longer (elytra/pronotum=1.47) but slightly nar-
rower(elytra/pronotum=0.97)thanpronotum,moreorlesstransverselydepressedin
apjca1sjxthalongposteriormarginexceptnearthemedianpart,eachelytronprovided
wjth four longitudinalcostaethroughout thelength,onesutural,twodisca1andone
humeral,ofwhichapairofsuturalonesarelessstrongthantheothercostae,surface
48 YasuakiWATANABE
Fig 3. Last four abdominal sternites
in male of Mic,-opeplus tlenoi Y.
WATANABE,sp nov.Scale:0.25mm.
ofeachinterspaceofcostaewithirregularrowsofsparingandcoarsepuncturesand
coveredwithcoriaceousgroundsculpture,1st interspacewitharow inanteriorhalf,
sometimestworowsinposteriorhalf,2ndwithtwoorsorows,3rdwiththreeorso
rows;epipleuralcostastronglyandarcuatelyraised;pseudepipleura1costapresentbe-
tweenepipleura1andhumeralcostae,almoststraightthoughabbreviatedinfront,inter-
space between pseudepipleura1and humeral costae provided with a row of coarse
punctures,andalsowithtwoirregularrowsofcoarsepuncturesoninterspacebetween
epipleura1andpseudepipleura1costae;surfaceoftheseinterspacessimilarlycoriaceous
totheotherinterspace.Hindwingseachdegeneratedtoaminutelobe.Legsrelatively
short;mesotibiaarmedwithasmallsubtriangular toothatapical fourthon internal
margin;metatibiaalsowithamoredevelopedtoothbehindthemiddleoninternalmar-
gin.
Abdomenrelativelyshort,graduallynarrowedtowards6thsegmentandabruptly
narrowed from7thsegment toapicalend;surfaceofeachtergiteimpunctate, though
coveredwithmuchfinercoriaceousgroundsculpturethanonelytra,4thto7thtergites
eachtransverselydepressedinbasalhalfandprovidedwiththreeequidistantlongitudi-
nalcostae,whichareabbreviatedinfrontofposteriormarginexcept forthoseof7th
tergitewhichareabbreviatedinbasalthird,8thtergitelingulatethoughsubtruncateat
theapex;3rdto6thsterniteseachprovidedwithtwolongitudinalcostaeineachlateral
area,theinneroneabbreviatednearthemiddleofsternite,theouteronesomewhatar-
cuateandlongerthan theinneroneandextendingtoneartheposteriormargin,7th
sternitealsowithtwocostaeineachlateralarea,inneroneminute,sometimesobscure,
outeroneabbreviatedinposteriorthree-fourths,broadlyemarginateat themiddleof
posteriormargin,8thsternitesomewhatemarginateat themiddleofposteriormargin
andsemicircularly attenedbeforetheemargination.
Genitalorganelongateandalmostsymmetrical,moderatelysclerotizedexcept for
ventralsideofmedianlobewhichismembraneous.Medianlobefeeblyconstrictedat
themiddle,abruptlynarrowedapicadinapicalthirdandsubtruncateattheapex.Para_
mereseachnarrowandfusedwithmedianlobe,nearlyaslongasmedianlobeandta_
poredinapicalthirdtowardsthepointedapex.
Female. Similaringeneralappearancetomale,butdifferent fromit inthe fol-
lowingpoints:headnarrowlyroundedoffatthemiddleofanteriormargin,8thsternite
NewMicropeplinesfromSichuan 49
5 6
Figs. 4-6. MalegenitaliaofMic,,opeplusueno1Y.WATANABE,spnov;dorsalview(4),lateralview(5),
andventralview(6).Scale:0.25mm.
somewhatproducedbackwardlyatthemiddleofposteriormarginandbroadlyrounded
attheapex;meso-andmetatibiaeeachlackingthesubtriangulartooth.
Typeseries. Holotype: ,allotype: Mt.ErlangShan,JiajinShanMts.,Lu-
,
ding Xian, Sichuan Prov., SW China, 2-X-1996, S. NOMuRA & L. ZHAo le9.
paratypes:2 14 ,samedataas for theholotype;2 1 ,samelocality and
, ,
date,S.NoMuRAleg.ThetypeseriesisdepositedatpresentinthecollectionoftheNa-
tjona1scjenceMuseum(Nat.Hist),Tokyo,except for threepairsof theparatypeS
whjcharepreservedinthecollectionoftheLaboratoryofInsectResources,Tokyo
UniversityofAgriculture.
Distribution. SouthwestChina(SichuanProv).
Thetypespecimenswereobtainedbysiftingdeadleavesorthelitte「
Bjonomjcs.
jnamjxedforestofpersistentdeciduousbroadleavedtrees,withadditionofaSmall
numberofconiferoustreesonthewesternsideofMt.ErlangShanatanaltitudeof
2,860m.
Thepresentnewspeciesissimilar toM.umcormsYANG(1995,P・
emar
218)fromzhe.jiangProvinceingeneralappearancebutisdifferent fromitinthefol-
lowingpoints:elytrashorter,theinnercostaincurvedbeforethemiddle,1stinto「Space
witharowofpuncturesinanteriorhalf,andthemedianlobeofmale9enita1o「9an
gentlyconstrictedatthemiddle.Alsosmi ilartoM.clypeatusCAMBELL(1992,P・212)
fromTajwanjnfacjesandbodysize,butcanbedistinguishedfromitbythefo11oWin9
pojnts:elytralesscoarselyandmoreshallowlypuncturedonthesurface,PrOtibiain
50 YasuakiWATANABE
malelackingtooth,malegenitalorganwithmedianlobenearlyobliquelytruncatedat
theapex,parameressomewhatshorterthanmedianlobe.
Etymology. Thepresent newspeciesisdedicatedtoDr.Shun-IchiUENo,who
wastheleaderoftheinvestigationonthesoil-livingbeetlesofSichuanProvincein
1996.
Micropeplusnomurai'Y.WATANABE,sp nov.
(Figs7-12)
Body length: 2.3-2.4mm(fromfrontmarginofheadtoanalend);1.4-1.5mm
(fromfrontmarginofheadtoelytra1apices).
Male and female. In faciesandbodysizeresemblestheprecedingspecies,
butcanbedistinguished fromitbythefollowingpoints:headprovidedwithaweak
longitudinalcarinaatthemiddleinbasalhalfandwithlesscoarsecoriaceousground
sculpture,pronotummorestrongly narrowedanteriadinanterior two-thirds,surface
lesscoriaceous;elytraasbroadaspronotum,lessdepressedinapicalpartalongposte-
riormargin,eachelytronprovidedwithfour longitudinalcostaethroughout thelength
asintheprecedingspecies,but theinnerdisca1costaisalmoststraightand1st inter-
spacewithirregularrowsofpunctures,surfaceofalltheinterspacesmorestronglyand
deeplypuncturedthoughlesscoriaceous,pseudepipleura1costasomewhatshorterand
abbreviated at anterior fourth; abdomenshining, not coriaceouson thesurface, 8th
Fig. 7. Mic''o e /lls ,10,mi,・al Y. WATA-
NABE,sp nov., , fromMt.Jiuding
Shanof theChapingShanMts., in
Mao Xian of Sichuan Prov., SW
China.Scale:0.5mm.
NewMicropeplinesfromSichuan
51
Fig. 8. Headof Mid・opeplus ,1omu,・al
Y. WATANABE, sp nov., Scale:
,
0.25mm.
Fig.9. Lastfourabdominalsternitesin
male of Micropeplus nomutai Y.
WATANABE,Sp nov.Scale:0.25mm.
Figs. 10-12. MalegenitaliaofMic''opeplusno1mt'・alY.WATANABE,sp nov; dorsal view (10), lateral
view(11),andventralview(12).Scale:0.25mm.
stemitemoredeeplyemarginateatthemiddleofposteriormargin.
Malegenitalorganalsocloselysimilar inconfigurationtothatofthepreceding
species,butslightly different from it in the followingpoints:median loberelatively
52 Yasuaki WATANABE
shortthoughmoreor lessbroaderthanthatoftheprecedingspeciesandmorestrongly
narrowedinapicalthirdtowardstheapex.
Typeseries. Holotype: 3,allotype: ,Mt.JiudingShan,ChapingShanMts.,
Mao Xian,Sichuan Prov., SW China, 22-IX-1996,S. NoMuRA & L. ZHAo leg.
Paratypes:3 3 ,samedataas fortheholotype. Thetypeseriesisdepositedat
,
present inthecollectionoftheNationalScienceMuseum(Nat.Hist), Tokyo,except
for2pairsoftheparatypeswhicharepreservedinthecollectionoftheLaboratoryof
InsectResources,TokyoUniversityofAgriculture.
1'strz'buff'o SouthwestChina(SichuanProv)
.
Bionomzcs.. Thetypespecimenswereobtainedbysiftingdeadleavesorthelitter
inadeciduousbroadleavedforestonMt.JiudingShanatanaltitudeof3,670m.
Etymology. Thespecificepithet is given after Dr.Shuhei NoMuRA, National
ScienceMuseum(Nat.Hist),Tokyo,whokindlysuppliedmewiththespecimensof
thetypeseries.
要 約
渡辺泰明:中国四川省から採集されたセスジチビハネカクシ属 (甲虫日ハネカクシ科) の2
新種. 一 中国からは, セスジチビハネカクシ属に含まれる種が, これまでに浙江省から3種,
云南省から2種の合計5種が知られているにすぎなかった. 1996年9月下旬から10月上旬にか
けて, 上野俊一博士の主宰による 「四川省における土壌性甲虫類の調査」 が実施された. この
調査を通じて, 野村周平博士および趙立軍氏によって採集されたセスジチビハネカクシ属に含
まれる種を検討した結果, 2新種を見出すことができたので,下記のとおり命名・記載した.
1. Micr,opeplusuenoiY.WATANABE
この種は, 央金山山地に位置する二郎山の標高2,860mの地点で, 落葉および常緑の広葉樹
林にわずかの針葉樹が散在する混交林に堆積した落葉層から採集された. 雄の頭部前緑中央が
鋭く突出していることからMfulvus群に所属する種で, 概観は浙江省から発見されたM. urn_
corn,s,および台湾からのM.clypeatusの両種に類似している. しかし前者とは, 翅鞘がより短い
こと, 背面の縦隆条および間室の点刻などの状態, さらに雄交尾器の形状が異なることによっ
て区別され,後者からは翅鞘の点刻がより弱く,雄の前脚隆節内側の小突起を欠くこと, およ
び交尾器の形状の違いによって区別される.
2. Micropephts.''tomu'alY.WATANABE
本種は茶坪山山地に位置する九頂山の標高3,670mの地点の,落葉広葉樹林の林床に堆積し
た落葉層から採集された.体長および外部形態は前種に類似しているが,頭部中央の基半に縦
隆条をそなえ,表面の微細構造がより弱いこと,翅鞘は前胸背板と同幅で,背面の4縦隆条が
いずれも直線的であり,間室はより強く点刻されることで異なる.雄交尾器の形状も前種のも
のによく似ているが, 中葉はいくぶん太短く,末端の1/3が急激に細まることで区別される.
References
CAMBELL,J.M.,1992. ArevisionofthefamilyMicropeplidae(Coleoptera)ofTaiwan. BullnatnMus
NewMicropepIinesfromSichuan 53
nat.Sci.,「aichung,(3):209-224.
WATANABE,Y., l995. Anewmicropeplidspecies(Coleoptera)fromYunnanProvince,SouthwestChina.
Elyt,・a,To(kyo,23:245-249.
- & Luo, Z., 1991. Themicropeplids (Coleoptera) from the Tian-mu Mountains in Zhejiang
Province,EastChina. Ibid.,19:93-100.
- & - 1996. AnewspeciesofthegroupofMic・,opeplussculptus(Coleoptera,Staphylinidae)
fromMt.JizuShaninYunnanProvince,SouthwestChina. Edapho1ogla,(57):1-6.
YANG,C.,1995. Coleoptera:Micropeplidae. InWU,H.(ed), InsectsofBaishanzuMountain,Eastern
China,218-219.ChinaForestryPublishingHouse,Beijing.
Elytra,To(kyo,28(1):53,May15,2000
NewRecordsofLathrobzumuenozY.WATANABE(Coleoptera,
Staphylinidae) fromWesternHonshu,Japan
YasuakiWATANABE
LaboratoryofInsectResources,TokyoUniversityofAgriculture,
Atsugi,Kanagawa,243-0034Japan
Inthepreviouspaper(WATANABE,1980),Lathrobiumueno1wasdescribedbasedonamale
specjmenfoundjnalimestonecave(Shizushi-do)ofMizuho-choinKyotoPrefecture.Since
then,thisspecieshasnotyetbeenrecordedfromother localitiesofJapan.InthePresentShe「t
artjcle,new1ocaljtjesofthisspecieswillbereported.TheywereobtainedfromupperhypOgean
habjtats.IthankDr.Shun-IchiUENoandProf.YoshiakiNIsHIKAwAfortheirkindnessinP「oVid-
ingmewiththespecimens.
2 Kojo(510malt),Muraoka-cho,Mikata-gun,HyogoProf.,Japan,9-X-1987, S・
UENoleg.,, 1 ,samelocalityanddateasabove,Y.NIsHIKAwAleg;1 Takara-dani(300malt・),
,
Tsuzuraorj,Hjgashibetsuin-cho,Kameoka-shi,KyotoPref.,Japan,14-IX-1992, Y.NISHIKAWA
leg.
Reference
TwOnewLathrobium(C01eoptera,Staphylinidae) foundinlimestoneCavesOf
WATANABE, Y., lg80.
Japan. J.speteo1.Soc.Japan,5:21-28.