Two New Apterous Lathrobium (Coleoptera, Staphylinidae) from the Ta-hsueh Shan Mountains in Taiwan

9 Pages·1998·9 MB·English

by  Watanabe, Y

Elyt''a,7lokyo,26(2):303-311,November15,1998
TwoNewApterousLathroblum(Coleoptera,Staphylinidae)
fromtheTa-hsiiehShanMountainsinTaiwan
YaSuaki WATANABE
LaboratoryofEntomology,TokyoUniversityofAgriculture,Tokyo,156_8502Japan
Abstract TwonewapterousLath1,obiumaredescribedandillustratedunderthe
namesL. (s.str) talwanenseandL.(s.str)shaolaiense.Theformerwasobtainedfrom
theupperhypogeanzoneonMt.Hsiao-hsiiehShanandthelatter fromthehumouszone
onMt.Shao-laiShan,bothlyingontheTa-hsiiehShanMountainsinTaichungHsien,
Taiwan.
Noapterousstaphylinidsof thegenus Lathrobiumhavehithertobeen recorded
fromTaiwan.ThroughthecourtesyofDr.Shun-IchiUENo,Ihadanopportunitytoex-
aminetwoapterousLathrobiumwhichhadbeen found fromtheupperhypogeanand
humouszonesoftwodifferentmountainsinTaichungHsien,Taiwan.0neofthem,ob-
tainedonMt.Hsiao-hsiiehShan,belongstothegroupofLnomura1becauseofhaving
non-transverseheadandelytraandinconspicuoussecondarysexualcharactersofthe
abdominna1sternitesinthemale,whiletheother,obtainedonMt.Shao-1aiShanlying
ontheTa-hsiiehShanMountains,belongstothegroupofL.pollensbacauseoftrans-
verseelytraandremarkablesecondarysexualcharactersoftheabdominalsternitesin
themale.
Afteracarefulexamination,ithasbecomeclearthatthesespeciesarenewtosci-
encebecauseofdisagreementwiththeknownmembersoftherespectivegroupsinthe
secondarysexualcharactersoftheabdominalstemitesandconfigurationofthemale
genitalorgan.Theywillbedescribedinthepresentpaper.Theho1otypesofthetwo
newspeciestobedescribedaredepositedin thecollectionof theNational Science
Museum(Nat.Hist),Tokyo.
Beforegoing further,IwishtoexpressmyheartythankstoDr.Shun-lobiUENo,
VisitingProfessoratTokyoUniversityofAgriculture, forhiskindnessinsupplyingme
withtheinterestingspecimensandvaluableadviceonthepresentstudy.
1) ThisstudyissupportedinpartbytheGrant-in-aidNo.01041099forFieldResearchoftheMon-
bushoInternationalScientificResearchProgram,Japan.
304 Yasuaki WATANABE
Lathrobium(s.str)talwalte'tseY.WATANABE,SPnov.
(Figs.1-2,4-5)
Bodylength:7.9mm(fromfrontmarginofheadtoanalend);5.0mm(fromf「ont
marginofheadtoelytra1apices).
Bodyelongate,parallel-sidedandsubdepressedabove.Colourreddishbrownand
shjning,withpalpi,apicalantennalsegmentsandlegssomewhatPale「.
Headsuborbicular and gentlyelevatedmedially,slightly1onge「 than
Male.
Fig. 1. Lat/1,-obiu,n (s. str) taiwanense sp.
holotype, from Mt. Hsiao-hsiieh
nov.,
Shan, Ta-hs11ieh Shan Mts. in Taichung
Hsien,Taiwan. Scale:1.0mm.
NewApterousLath・,oblumfromtheTa-hsuehShans 305
broad(length/width=1.04),widestatposteriorthirdandmorestronglynarrowedpos_
teriadthan anteria withlateralsidesgentlyarcuate, frontalareabetweenantennaltu_
berclestransversely attenedandglabrousalongfrontalmargin,providedwjthacon_
spicuoussetiferouspunctureinsideeachantennaltubercle;surfacesparingly,coarsely
andsetiferouslypuncture thepuncturesbecomingmuchfinerandmoreor lessru_
gcseinlatero-posteriorareas;eyesrelativelylargeandslightlyprominent, their1ongi_
tudina1diametermorethanahalfaslongaspostocularparts.Antennaeelongate,ex_
tendingtonearthemiddleofpronotum,twoproximalsegmentspolishe 3rdsegment
Subopaque,theremainingsopaque,1stsegmentrobustandstronglydilatedtowardsthe
apex,morethantwiceaslongasbroad,2ndconstrictedatthebase,about15timesas
longasbroad,but lessthanahalfaslongasandmuchnarrower(2nd/1st=0.73)than
1st,3rdalittledilatedapica morethant5timesaslongasbroad,somewhatlonger
(3rd/2nd=1.13) thoughas broad as2n 4th distinctly longer than broad(length/
width=1.60),alittleshorter(4th/3rd=0.89)andslightlynarrower(4th/3rd=0.86)than
3rd,5thto8thequal inbothlengthandwidthtooneanother,eachdistinctlylonger
thanbroad(length/width=1.40),somewhatshorter than(eachof5thto8th/4th=0.88)
thoughasbroadas4th,9thto11thequalinwidthtooneanother,9thsomewhatlonger
thanbroad(length/width=1.36),slightlyshorterthan8th(9th/8th=0.97),10thalittle
longerthanbroad(length/width=1.20),slightlyshorterthan9th(10th/9th=0.88),11th
fusiform, about twiceas longasbroad,considerably longer than 10th (11th/10th=
1.83),subacuminateatthetip.
Pronotumoblongandconvex,apparentlylonger thanbroad(length/width=1.19),
distinctly longer (pronotum/head=1.17)andslightlybroader (pronotum/head=1.02)
than hea widestatanterior fourthandmorestronglynarrowedposteriadthanante-
riad;lateralsides feeblyarcuateindorsalview,anteriormarginsubtruncate,posterior
margin slightly emarginateatmiddle, anterior angles obtuseandnot visible from
above,posterioranglesrounded;surfacecloselycoveredwithcoarsepunctures,bear-
inganarrowsmoothlongitudinalspacealongthemedianline.Scutellumsubtriangular
andsomewhatconvex,providedwithafewminutesetiferouspuncturesonthesurface.
Elytrasubtrapezoida1andsubdepressedabove,somewhat dilatedposteria slightly
longerthanbroad(length/width=1.02),distinctlyshorterthan(elytra/pronotum=0.86)
thoughasbroadaspronotum;lateralsidesvery feeblyarcuate,posteriormarginemar-
ginateandforminganobtusere-entrantangleatthemiddle;posterioranglesbroadly
rounded;surfacedensely, roughlyandsetiferouslypuncturedallover.Hindwingsde-
generatedtominutelobes.Legsrelativelyslenderandmoderatelylong;profemurre-
markablythickened,thoughstronglyconstrictednearthebaseandexcavatedinapical
haltontheinner face,sothattheanteriorpartoftheexcavation formsasubtriangular
blunttooth;protibiadilatedapica hollowedinbasal half on theinner faceandpro-
videdwithfiveorsotransverserowsofcomb-likeyellowishsetaewithinthehollow;
meso-andmetatibiaenormal;1st to4thprotarsa1segmentsstronglywidened;meso-
andmetatarsi thin.
Abdomenelongate,graduallywidenedtowardsthe7thsegmentandthenabruptly
306 Yasuaki WATANABE
narrowedfromthe8thtoanalend,3rdto7thtergiteseachtransverselydep「eSSedalon9
thebaseandmoderatelycloselycoveredwithfineaciculatepuncturesandb「oWnSih
pubescence;8thsterniteV-shapedlyexcisedattheapex;7thsternitealsoshallowlyand
broadlyemarginateatthemiddleofposteriormargin.
Fjgs.2_3. AbdominalstemitesinthemaleofLath1・obium(s.str)spp;L.(s.str)talwanenseSP nov. (2),
andL.(s.str)shao/alensespnov.(3). Scale:0.5mm.
Figs.4-6. MalegenitalorganofLat1/,・obiu,n(s.str)talwanensesp nov;dorsalview(4),lateral view
(5),andventralview(6). Scale:1.0mm.
NewAptcrousLat111・chiff,nfromtheTa-hsLichShans 307
Genitalorganelongateandwellsclerotizedexcept formembraneousventralside
ofmedian lobe;medianlobesomewhatshorter andnarrower than fusedparamere,
widest near basal fifth and thenabruptly narrowedbasadandgradually so apica
thoughnearlyparallel-sidedinapicalhalf,withventral scleriteelongate,widestnear
themiddleandthenmarkedlynarrowedtowardstheacutelypointedbaseandslightly
narrowedtowardstheapicaltipwhichistruncated.Fusedparamereelongate,strongly
curveddorsad inapicalhalf,apicalpartdividedintotwolobes,eachofwhichisdi-
latedintoasecuriformapicalportionasseenfromdorsalside.
Female. Unknown.
Type specimen. Holotype: Mt. Hsiao-hsi.ieh Shan, Ta-hsiieh Shan Mts.,
,
TaichungHsien,Taiwan,15-VI-1989,S.UENoleg.
Distribution. Taiwan.
Rema1・ks. ThisnewspeciesbelongstothegroupofL nomura1becauseofthe
longelytra, and canbereadily distinguished from the other members of the same
groupbythesmallerbodyandthedifferentconfigurationofmalegenitalorgan.
Bionomics. The type specimenwas dugout fromamuddy screedeposited
under asteep cliff at the northern side of Mt. Hsiao-hsiieh Shan at an altitude of
2,630m.
Etymology The new specificnameisderived fromTaiwan, inwhich liesthe
typelocality“Mt.Hsiao-hsiiehShan”.
LathrobiuM(s.str)shaolaie1'seY.WATANABE,sp nov.
(Figs3,7-10)
Bodylength:7.9mm(fromfrontmarginofheadtoanalend);4.1mm(fromfront
marginofheadtoelytralapices).
Thisnewspeciescanbedistinguishedataglancefromtheprecedingspeciesby
thetransverseheadandelytra,whichagreewiththecharacteristicsofthegroupofL.
pollens. Differing from themembersof thespecies-group inconfigurationofsec-
ondarysexualcharactersofabdominalsternitesandmalegenitalorgan.
Bodyelongate,subpara11e1-sidedandsomewhatdepressedabove.Colourreddish
brown andshining,with two apical abdominal segmentsand legsdark yellowish
brown.
Male. Headsubtrapezoida1andmoderatelyconvexmedially,alittletransverse
(wjdth/1ength=1.13),widestatbasal fourthandmoredistinctlynarrowedanteriadthan
posteriad;lateralsidesgentlyarcuate, frontalarea attenedandglabrousbetweenan-
tennal tubercles,providedwithalargesetiferouspunctureinsideeachantennaltuber-
cle;surfacesparinglycoveredwithdistinctsetiferouspunctureswhichbecomemoreo「
lesscloserandfinerthaninlatero-posteriorareas,andbearingasmallsmoothve「teXa1
area;eyessmallandnearlyflat,theirlongitudinaldiameteraboutone-thirdaston9as
postocularpart. Antennaeelongate,extendingtothemiddleofpronotumand not
thjckenedapjcad,twoproximalsegmentspolished,3rdsegmentsubopaqueandthe「e-
308 Yasuaki WATANABE
Fig. 7. af/1,-o llm (s. str) s(cid:0)o/a1ens sp.
nov., holotype, fromMt. Shao-1ai Shan,
Ta-hsiieh Shan Mts. in Taichung Hsien,
Taiwan. Scale:1.0mm.
mainingsopaque,1strobustandstronglydilatedapicad, twiceaslongasbroa 2nd
constrictedatthebase,about15timesaslongasbroadbutahalfaslongasandre_
markablynarrower(2nd/1st=0.70)than1st,3rdsubequa1to2ndinboth lengthand
width,4thand5thequaltoeachotherinbothlengthandwidth,eachsomewhatlonger
than broad (length/width=1.07)andslightlyshorter than (4th and 5th/3rd=0.75)
thoughasbroadas3r 6thto10thequaltooneanotherinbothlengthandwidth,each
alittlelongerthanbroad(length/width=1.20)andaslongasthoughslightlynarrower
NewAptcrousLa111,・obitmlfromtheTa-hsiichSI、ans 309
(eachof6thto10th/5th=0.89) than5th,11th fusiform,morethan twiceas longas
broadandmuch longer (11th/10th=1.67)butslightlynarrower (11th/10th=0.92)than
10th,subacuminateattheapex.
Pronotumnearlyoblong,apparentlylongerthanbroad(length/width=1.13),alit-
tle longer (pronotum/head=1.30) and slightly broader (pronotum/head=1.02) than
head,widestbehindanterioranglesandslightlynarrowedposteriad; lateral sidesal-
moststraightindorsalviewexceptneartheareasofanteriorandposteriorangles,an-
teriormargingentlyrounded,posteriormarginsubtruncate,anterioranglesobtuseand
notvisible fromabove,posterioronesrounded;surfacemorecoarselyandmorenu-
merouslypuncturedthanonheadexcept foranarrowsmoothmedianlinethroughthe
lengthofpronotum.Scutellumsmallandsubtriangular, providedwitha fewminute
setiferouspuncturesonthesurface.Elytranearlytrapezoidal,slightlydilatedposteria
alittletransverse(width/length=1.10)anddistinctlyshorter(elytra/pronotum=0.80)
thanandalmostasbroadaspronotum;lateralsidesslightlyarcuate,posteriormargin
emarginateatthemiddle;posterioranglesobliquelytruncated;surfacedenselycovered
with much coarser punctures than thoseonpronotum. Hind wings degenerated to
minutelobes.Legsrelativelyshort;profemurandprotibiasimilarinstructuretothose
oftheprecedingspecies.
Abdomenelongate,gentlywidenedtowards7thsegment,andthenabruptlynar-
rowedfromthe8thtoanalend;3rdto7thtergiteseachtransverselydepressedalong
thebaseasin theprecedingspeciesandmoderatelycloselycoveredwithsuperficial
puncturesand finebrownishpubescence,8thtergitemoresparinglyandmorefinely
puncturedthanontheprecedingtergites;8thsternitesubtriangularlyandasymmetri-
callyexcisedatapexanddeeplylongitudinallydepressedinfrontoftheexcisionalong
themedianline,surfaceofthedepressionprovideddenselywithshortrigidblackish
setae;7thsternitealsoarcuatelyandasymmetricallyemarginateatthemiddleofposte-
riormarginandlong-ellipticallydepressedatthemiddlebeforetheemargination,sur-
faceofthedepressionsmooth,6thsterniteprovidedwithashallowhorseshoe-shaped
depressionatthemiddlejustbeforeposteriormargin,surfaceofthedepressionsome-
whatcoarselyasperate;5thsternitealsowithasimilarsmallasperateareatothatof
6thsterniteatthemiddleinfrontofposteriormargin.
Genitalorgannearlyspindle-shaped.Medianlobeconsiderablylongerthanfused
paramere,withventralscleritewidestnearthemiddle,muchstronglynarrowedto-
wardsthepointedapexthantothebase,andsomewhatcurvedtotherightsideinapi-
calhalf.Fusedparamereasymmetrical,abruptlyconstrictednearapicalthirdandap-
parentlynarrowedtowardsthepointedapexwhichissomewhatcurvedtotheleftas
seenfromdorsalside,distinctlyemarginateinapical fourthinprofile.
Female. Unknown.
Typespecimen. Holotype: Mt.Shao-1aiShan,Ta-hsiiehShanMts.,Taichun9
,
Hsien,Taiwan,16-VI-1989,S.UENoleg.
Remarks. ThepresentnewspeciesmaybelongtothegroupofL. pollensbe-
causetheheadandelytraaretransverseandabdominalsterniteshaveconspicuousSeC-
310 YasuakiWATANABE
10
Figs.8-10. MalegenitalorganofLathrobium(s.str)shaolalensesp nov;dorsal view(8),lateralview
(9),andventralview(10). Scale:1.0mm.
ondary sexual characters. Itcanbereadily distinguished fromthemembersof the
groupbydifferentsexualcharactersoftheabdominalstemitesinthemaleanddiffer-
entconfigurationofmalegenitalorgan.
Bionomics. Theholotypewasdugout fromthesoil beneathdead leaves de-
positedinagullyinadeciduousbroadleaved forestonMt.Shao-1aiShanatanaltitude
of2,030m.
Etymology. Thenameofthepresentnewspeciesisderivedfrom“Mt.Shao-lai
Shan”,thetypelocality.
要 約
渡辺泰明:台湾産の後翅の退化したナガハネカクシ属の2新種 (甲虫目, ハネカクシ
科). - 台湾からはこれまで, 後翅の退化したナガハネカクシの仲間が知られていなかった.
私は最近, 上野俊一博士が1989年6月に台湾の台中県大雪山系の二つの山で採集された, この
グループに含まれる2種を検討する機会を得た. これらはいずれも地下浅層から掘り出された
が, 雄の腹部第二次性徴および交尾器の形状がこれまで知られた種のものとは一見して異なっ
ており, 新種と判断されたので, 下記のとおり命名, 記載した.
1. Lathrobium(s.str)taiwanenseY.WATANABE,sp
nov.
本種は, 大雪山系小雪山の標高2,630mほどの地点にある急斜面の岸壁の下に堆積した, 土
の多い岩錐の下端部から掘り出されたもので,頭部および翅鞘がいずれも幅よりも長いことで,
日本に分布しているオオコバネナガハネカクシ種群に含められる. しかし体が小型で, 雄の交
NewApterousLath,obiu,nfromt1、eTa-hsiiehShans 311
尾器の側葉は末端域が二裂し, しかもそれぞれの先端部分が斧状を呈する特異な形状で, この
グループの他の極から容易に区別できる.
2. Lathrobium(s.str)shaolaienseY.WATANABE,sp nov.
本種は, 大雪山系稍来山の標高2,030mほどの落葉広葉樹林内の, 凹地か小構に溜まった落
ち葉の下の石混じりの土の中から掘り出されたもので, 頭部および翅鞘のそれぞれが長さより
も幅が広いことで, 日本に分布しているコバネナガハネカクシ種群に含められる. しかし, 雄
の腹部に表われる第二次性徴の形状および交尾器の中葉が側葉よりいちじるしく長く, 後半は
急に狭まり, その部分が湾曲していることなどで, このグループの既知種から容易に区別でき
る.
References
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Rcpt.SaikyoUniv., at.Sci.&Liv.Sci),2A:2'1 'l2[incl.pls2-3],pi t.
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SHIBATA, Y.,1973. Preliminarycheck listof thefamilyStaphylinidaeofTaiwan(Insecta:Coleoptera).
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WATANABE,Y.,1992. NewspeciesofthegroupofLath''obiumpo11ens(Coleoptera,Staphylinidae)from
westernHonshu,Japan. Elytra,「okyo,20:189-196.
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Elytra,'「otkyo,26(2):311-312,November15,1998
ListoftheHostFungioftheJapaneseCiidae(Coleoptera),III
Makoto KAWANABE
BioindicatorCo.,Ltd.,Takada3-l6-4,Toshima-ku,Tokyo,171-0033Japan
Daedaleopslsconfragosa[Chamidareamitake]
Cismppomcus,Csenafopifosus,Sufcacis ms, 0ctotemnusgfa rlctlfus, 0./apom
cus,0. laminifrons,0.parvulus
Daedaleopsisstyracina[Egonokitake]
meart on c 01
Daedaleopsisporte、,is[Senbeitake]
Eu)cestocisbicornutus