Correct Identification of the Platycerus Species (Coleoptera, Lucanidae) Occurring on the Yunling Mountains in Northwestern Yunnan, Southwest China

2006·4.3 MB·

by  Imura, Y

E/、・t1・a,T1)k、・o,34(1):ll9-125.May20,2001(
CorrectIdentificationofthePlatycentsSpecies(Coleoptera,Lucanidae)
OccurringontheYunlingMountainsinNorthwesternYunnan,
Southwest China
YukiIMURA
Shinohara-cho1249-8,Kohoku-ku,Yokohama,222-0026Japan
Abstract Anewspeciesofthelucanidgenus/)/a0・col・fisisdescribed fromtl、e
YunlingMountainsinnorthwesternYunnanunderthename ell/)''e1'111('a'Is.
Inthefirstvolumeof“InsectsoftheHengduanMountainsRegion''publishedin
1992atBeijing,China,totallytwelvespeciesofthefamilyLucanidaewererecorded
byMAWen-ZhenfromnorthwesternYunnanandSichuanbaseduponthematerials
collectedby“thecomprehensivescientificexpeditiontotheHengduanMountainsRe-
gjon,AcademiaSinica'.Of these, themost noticeablewas“Plat、,cenlsdelicatulus''
whichwassaidtohavebeencollectedfrom“Weixi,Pantiange,2,920m'ofnorthwest-
ernYunnan.This recordwasveryimportant,sincenothinghadbeenknownonthe
samegenus from YunnanProvinceuntil that time. However, I cannotbutstrongly
doubttheaccuracyofthisidentifcation,orevenoftherecorditself,becauseofseveral
reasonsasmentionedbelow.
Inthefirstplace,1:)delicatulusisknowntobeendemictoHonshu,Shikokuand
KyushuoftheJapaneseArchipelagoanditsoccurrenceinnorthwesternYunnanmi9ht
bejmpossjbleunlessartificiallytransplanted.Besides,itsdescriptionmadebytheChi-
neseauthorcontainsseveralproblemswhichcannotbeoverlooked.TomakeSu「e, Iat
fjrstreproduceherdescriptionfollowedbyitsEnglishtranslationbelow.
(p 537)
(3)録竟報甲 Platycertls deticattllus Lewis, l883,新己i 最
体型小,較狭長,背面藍黑色, 雌虫的 色変化較大, 通常 録或 録色, 体表甚
光亮;体下黑色,腹部大多褐色或褐 色;足呈褐色或褐 色。触角浅褐色,棒部端'fl呈叉
状。
部稍微短 ,且厚,前角近三角形, 眼之前微 向隆脊形,上面有粗大刻点;
,, 眼很突出。上฀通A常呈黑色、深褐色或褐 色,雄性上฀較A長前 端尖 外 微呈弧形,上
,,, 近端部有l ,内 有3 ;雌性上฀較A短。前 胸背板短寛 寛 于鞘翅前 角稍微尖側
角很大,后角近直角形,側 和后 具有較窄 框;上面散布1田小刻点。小盾片半国形,散
120 YtlkiIMllRA
布小刻点。鞘翅狭長,商側平行,后外端角国弧形;上面平,西側向下外側 斜,肩凸明
,
匀布粗大刻点,毎翅具有5-7行明 刻点行。臀板不外露。后胸腹板中同光滑, 商側密
布刻点和黄色短 毛。腹部光亮,密布粗大刻点和黄色 毛。足較9田長,中、后足的隆一fl]
尤其 ,后足隆 微弧弯,前足 外 有5个小歯; 長而厚,爪大微弯曲。
(p 538)
1 , 体長: 14.9- l8.5mm (帶上i z) 15.3-l6. mm不(帶上 );体 6.1-7.5mmo
采集己i 最: 云南(集西攀天 ,2920m,1981. ViI 20- 21,5cf(f)。
分布: 云南;日本。
(3)Liikuanqiaojia Platycerusdelicat1llusLEWIS,1883,newrecord
Bodysmall,relativelynarrowandelongated,withthedorsalsurfacebluishblack,
colorationof femalerathervariable,usuallybearingbluishgreenorcopperygreen,
bodysurfacestronglypolished;venterblack,mostpartofabdomenbrownorreddish
brown; legsbrownorreddishbrown.Antennaepalebrown,andfissate.
Headrathershort,wideandthick,withthefrontanglesnearlytriangularinshape,
alittleconvexaboveinfrontofeyes,uppersurfacescatteredwithlargepunctures;eyes
stronglyprotruded[laterad].Mandiblesusually black,deepbrownorreddishbrown,
thoseinmalelonger,pointedatapices,outermarginsgentlyarcuate,bearingasingle
toothonuppermarginnearthebase,andthreeteethininnermargin; femalemandibles
shorter.Pronot11.mshort andwide,wider thanelytra,withthe frontanglesslightly
pointed,lateralanglesverylarge,hindanglesnearlyrectangular,lateralandbasalmar_
gins narrowly bordered; upper surfacescattered withminute punctures. Scutellum
semicircular,scatteredwithsmall punctures.Elytranarrowandelongated, parallel_
Side postero-outerangles rounded; dorsalsurface at,withthelateralportions jn_
Clinedoutwards,shouldersdistinct, homogeneouslyscattered with largepunctures,
each elytronwith5-7rowsofclearlysetpunctures.Pygidiumnotexposed. Central
Pa「tofmetasternumsmoothandglossy,coarselyscatteredwithpuncturesandshort
yellowhairsbilaterally.Abdomenshiny,coarselyscatteredwithlargepuncturesand
yellowhai「S.Legsrathernarrowandlong,aboveallinmeso-andmetaljbjae,metaljbja
gentlyarcuate,protibiawithfiveteethonoutermargin;tarsinarrow, longandthjck,
clawslargeandgentlyarcuate.
Length: 14.9-18.5mm (including mandibles), 15.3_16.1mm (excludjng
mandibles);width:6.1-7.5mm.
Collectingdata:Yunnan(WeixiPantiange,2920m,1981.vIl 20_21,5
)
Distribution:Yunnan;Japan.
Themostincomprehensiblepointisthatthedescriptioncontainsthefindingson
thefemaleat least incolorationandlengthofthemandibles, inspiteofshowjngno
「eCO「dofthefemaleinthecollectingdata.Besides,itisnotacceptablethatthelength
1:)/(1tl,'('e/'fisSpeciesfromtheYunlingMountains 121
of thespecimensmeasured14.9-18.5mm. It is truethat delicattllus is one of the
largestspeciesofthegenusPlatyce1・usdistributedinEastAsia,andyetitslengthin_
eludingthemandiblesreachesalittleover t5mmeveninthelargest individual. It is
absolutelyimpossibletoreach18.5mm,however largeitmaybe.Moreover, thisde_
scriptioninformsusofalmostnothingoftaxonomicimportance. Itdoesnotmention
anythingaboutdetailedstructureofthemalemandiblesandgenitalorgan,bothof
whichareindispensableintheclassificationofPlatycerus.Inmyview,theauthormay
have identified thespeciesonlybecauseofsimilarity inbody formandcoloration,
whichshemayhavejudged fromtheillustrationshownincertainpicturebooksofthe
JapaneseColeoptera. Impossiblylargesizeofthespecimensmayhavebeencaused
simplybyamistakeforsomereason.
Thus, the truth about the Platyce1-usspecies recorded from Yunnan is still
wrappedinmystery. Ifitsdescriptionwereaccompaniedwithillustrations,wecould
knowsomethingmoreaboutthebeetle.Fromthepoorandpartlyincorrectdescription
alone,however,itisimpossibleeventoassumeitsidentity.Itmaybelongtothegenus
Platyce1'us,but itstruesystematicpositionremainsunknownuntil thespecimensin
questionarere-examinedbyanexperiencedspecialists.
Inordertodispelmydoubt,Itriedtore-examinethespecimensinquestionwhich
mightbepreservedinthecollectionoftheAcademiaSinica,Beijing.Atmyrequest,
Dr.YuPeiyu,theformerprofessorofthesameinstitute,kindlytooktroubletofindthe
1ucanidspecimens,buttheresultwasquitepessimistic.All thespecimensonceexam-
inedbyMAseemtobemissingnow,andnobodycanre-examinethem.
Tosolvetheproblem, IvisitednorthwesternYunnanatthebeginningofOctober
2005. Imadeasurvey inthehighaltitudinalareaoftheYunlingMountainsonwhich
bothWeixiandPantiangeare1ocatecしandsucceededin collectingalongseries of
Platycerusspecimensatthreedifferentstations.Theserieswascomposedofasingle
speciescompletelydifferent from1)delicatulusinbothexternalappearanceandmale
genitalicstructure,aswasexpected.TheYunnanraceisconsideredtobemostclosely
alliedto dundai known fromwest-centralandsouthernSichuan,but apparentlydis-
tinguishablefromthatspecies. Inthefollowinglines, Iamgoingtointroduceit into
scienceunderthenameoff)cupreimicansnov.
Beforegoing into description, I wish to express my sinceregratitude to Mr.
Yoshiyuki NAGAHATA (Yonezawa) andMr. FAN Ting (International Academic Ex-
changeCenteroftheAcademiaSinica,Chengdu) for theirkindaidthroughmyfield
work.HeartythanksarealsoduetoDr.Shun-lobiUENo(NationalScienceMuseum,
Tokyo) forrevisingthemanuscriptofthispaper.
PlalyeeruscupreimicansIMURA,spnov.
(Figs.1-6)
Length (including mandibles): , 9.6-l2.7 (arithmetic mean 11.23)mm;
,
9.7-12.2(arithmeticmean11.05)mm.Dorsalsurfacestronglypolishe with theco1-
122 YtlkiIMUR、
Figs.1-4. Plat、・col・fis dipl・e11111cans from a pass ca. 5km east of Pantiange of northwestern
Yunnan. - 1.3,Holotype( )12、4.paratype( )(1&2.dorsalview;3&4.ventralvie、v).
orationcoppery or brassy with a faint greenish tinge inbothsexes; venter reddish
brownwiththeexceptionofheadandpronotumwhicharemuchdarker,aboveall in
male;mandiblesandpalpidark brownthoughpartlyreddishbrown;antennaedark
brown, thoughbasalandmedianportionsofscapes reddishbrown; femorayellowish
brownexcept fordarkerapicaltips,tibiaealsoyellowishbrownthoughusuallyalittle
darker thanin femora, tarsiandclawsbrownthoughusually alittledarker inbasal
parts.
Mostcloselyalliedtot:)dunda1IMURAetBARToLozzI(sensuIMURA,2005)known
fromwest-centralandsouthernSichuan,butdistinguished fromthatspeciesas fol-
lows: 1)sizemuchsmaller;2)coloration verydifferent;3)malemandiblesalittle
shorteronanaverage,withtheoutermarginsalittlemoreroundlyarcuate,dorsalsur-
facemorenarrowlyconcaveinbasalportions,innermarginsofretinaculaquadri-to
hexadentateoneachside;4) lateralsidesofpronotummoreremarkably angulateat
basalthirdandmorestronglyconvergenttherefromtowardsfrontangles.
MalegenitalorganasshowninFig 6a-h; paramerealmostas in P dundai,
thoughobviouslynarrowerandlessacutelynarrowedtowardsdorso-posterioranglein
lateral view;aedeagusalittleshorterandalittledifferentinshapeinlateral view;a
pairofvisor-likeprotuberanceslarger,widerandmoreobtuselyroundedattips.
FemalegenitalorganasshowninFig 6i,withtheinnerapicalangleofgonocox-
itenearlyrectangularandhardlyprojectedpostero-internally,stylusrobuster.
Typeseries. Holotype: (S, passca 5km east of Pantiange [攀天各]], 2,850-
P/(It、'ce'1'11.,SpeciesfromtheYunlingMountains 123
Fig 5. MalemandiblesofPlatyce・,uscttp,-elmlcansfromapassca.5kn、eastofPantiangeofnorthwest-
ernYunnan.
o ] 2,950m in altitude, in Weixi-1isuzu-zizhuxian [ﾜ能'西保保族自治-鎰 , f northweste
Yunnan,SouthwestChina,3-X-2005,Y.IMURA&Y.NAGAHATAleg.,tobedeposited
in the Department of Zoology, National Science Museum (Nat. Hist), Tokyo.
Paratypes[totally34 41 十7exs.]: 1 3 (十1brokenspecimen),samedata
, ,
as for theholotype; 10(S(S, 5 (十3brokenspecimens),samelocality,4-X-2005;
1 3 ,samelocality,larvaecollectedinthefieldandemergedinthelaboratoryin
,
thewinter of 2005-2006; g 9 (十3brokenspecimens), pass ca. 14kmeast-
,
southeastofWeixi,3,200-3,400minaltitude,onthebordersofWeixi-1isuzu-zizhu-
xian and Lijiang-naxizu-zizhuxian [兩江ｽ内' 西族自治 l-], of northwestern Yunnan,
SouthwestChina,5-X-2005;5(S(S,5 ,samelocality,6-X-2005;3,3(S,4 , same
locality, larvaecollectedin thefieldandemergedin thelaboratoryinthewinterof
2005-2006; 6 ,8 ,easternslopeofMt.LaojunShan[老 山], 3,000-3,400min
altitude, near thebordersbetweenLijiang-naxizu-zizhuxianandJianchuanXian [剣
1、、」lL],ofnorthwesternYunnan,SouthwestChina,7~8-X-2005;4 ,samelocality,
larvaecollectedinthefieldandemergedinthelaboratoryinthewinterof2005-2006;
allcollectedbyY.IMURA&Y.NAGAl-lATAandpreservedinColl.Y.IMURA.
Notes. Hindanglesofthepronotumofthenewspeciesarerounded,sothat it
belongstothegroupofPdelicatulus.Itisdiscriminatedataglancefromallthehith-
ertoknownmembersofthegenusinhavinguniquelycoloreddorsalsurface.Itsmale
mandiblesandgenitalorganarealsouniqueintheshapeanduseful fordifferentialdi-
agnosjs.Judgingfromthebasicstructureofthemalegenitalorgan,thenewspecies
doubtlessbelongstothesamegroupasl;)dunda1(IMURA&BARTOLOZZI,1994;See
also IMURA, 2005) distributed in the west-central and southern part of SiChuan
Province.
Thenewspecieswas found fromthreedifferentsitesontheYunlingMountains.
Thoughgeographicalvariationishardlyrecognizable,theLaojunShanspecimensare
124 YukiIMURA
a
h
d
e
Fig. 6. GenitalorganofPlalyce''fiscup・,elmicansfromapassca.5kmeastofPantiangeofnorthwestern
Yunnan. - a-c,Paramere(=lateral lobe)andbasalpiece;d-h,aedeagus(=medianlobe),1,left
gonocoxiteofthefemalegenitalia. - a& Ventralview;b,e&i,dorsalview;c&f,rightlateral
view;g,viewfromaedeaga1apex;h,rightsubventralview.Scale:1mm.
obviouslylargerthanthosefromtwoother localities.Therangeofbodylengthandthe
arithmeticmean(abbreviatedtoM)ofthespecimensfromeachlocalityareasfollows:
1) PassEofPantiange: tc2-12.0(M il23)mm; , 10.9-11.7(M1087)
mm.
Platyce11'1sSpeciesfromtheYunlingMountains 125
2) PassESEofWeixi:e,9.6-11.8(M1087)mm;9,9.7-l2.0(M1087)mm.
3) LaojunShan: ll7-12.7(MI2.14)mm;9,11.1-12.2(Mil72)mm.
Themainhabitatofthenewspeciesisdeciduousbroadleavedforestpartlymixed
withconiferoustrees(P'inus,Tsuga,Ables,etc.)nowrathersporadically remainedin
thehighaltitudinalareaoftheYunlingMountainswithintherangebetween2,800m
(abovethepinetreeandevergreen oak treezone) and3,400m (below Ables and
Rhododend1-onzone)inthealtitude.
All theimaginescollectedwerehibernatingmainly inwhite-rottenpart ofold
branchortrunk.Thefoodplantso量onpreferredbythenewspeciesareAcer,Prunus,
Betula,Tuia,Rhododendronandcertainkindofcamphor tree.Fromthesameenviron_
mentalcondition,werediscoveredmanylarvaeofPlatycerusmostprobablyreferable
tothesamespecies.Thepresentnewspeciesalsoleavesapeculiarovipositionmark
onthesurfaceofitsfoodplant.
要 約
井村有希:中国云南省北西部云山ii山脈に産するルリクワガタの正体. - 中国科学院青藏
高原'宗i 合科学考察 による 「横断山区昆虫」第一f日- (1992年5月出版) のなかで, 同院動物研
究所の馬文珍により, 「云南, 9iti西攀天同, 2,920m」からルリクワガタ属の1種がPlatyce,us
delicatuhlsという同定名のもとに記録された. 云南省からはそれまで, ルリクワガタ属は知ら
れていなかったので, これはたいへん貴重な記録として注目すべきものであった. しかしなが
ら, わが国の特産種とみなされてきたPdo/,catu/usが云南省北西部に自然分布しているとは考
えにくいうえ, 記載文にも不可解な点が含まれており, 同定あるいは記録そのものの信憑性に
つよい疑念がもたれたため, 筆者は問題の標本について中国科学院に間い合わせたが, 使用さ
れた標本は現在, 行方がわからなくなっており, 再鑑定をすることはできなかった. そこで,
間題を解決するべく2005年10月上句,筆者自ら「能ｽ西攀天同」の ฀るz.、南省北西部の云ll ・
脈高所を調査したところ, 同所にはたしかにルリクワガタ属の1種が生息していたが, 案の定,
pdelicatulusとは似ても似つかぬまったくの別種であることが判明した.云山令山脈の種は,四
川省中西部と南部から記録されているデュンダルリクワガタにきわめて類緑が近いものと考え
られたが, 比較検討の結果,未記載極と判断されたので, その特徴的な体色と強い光沢にちな
み, アカガネルリクワガタpcup,・emi tcansという名を与え,新種として記載した.
References
lMURA,Y,2005. OnthegenusPlatyce1・fis(Coleoptera,Lucanidae)ofMt.Gen99aShanandMt.E「Ian9
shanjnwest-centralSichuan,SouthwestChina. Elytl'a,7olkyo,33:501-512.
_ & L BARToLozzl,1994 DescriptionsOftwOnewspeciesOfPlatyce1'its(C01eOPte「a,LuCanidae)
fromcentralSichuan,CentralChina. Ibid.,22:139-143.
coleoptera:PassalidaeandLucanidae.In:lnsectsoft/1eHengd1lanMountainsRe9tOn,
MA, w_z,1gg2.
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