Three New Species of the Genus Erichsonius (Coleoptera, Staphylinidae) from Southern China

9 Pages·2001·9.6 MB·English

by  Watanabe, Y

E、l・Ila,Tcik、o,29(1):217-225,Junel5,2001
ThreeNewSpeciesoftheGenusErichsonlus(Coleoptera,
Staphylinidae) fromSouthernChina
YaSuakiWATANABE
LaboratoryofInsectResources,TokyoUniversityofAgriculture,
Atsugi,Kanagawa,243-0034Japan
Abstract Three new speciesof thestaphylinidgenusE,・ie1/.soniusaredescribed
underthenames,E.,11shikawai,E.IM:haienstsandEyunnanus.Thefirstspeciesisob-
tainedinGuangxi,thesecondfromSichuanandthethirdfromYunnan.Allthespecimens
arefoundfromunderdeadleavesaccumulatedatthesidesofstreams.
Uptothepresent, fivespeciesofthegenusErichsoniushavebeenreported from
Continental Chinaby BERNHAUER(1939, 1944) andZHENG(1993). Of these, two
speciesrecorded fromChinabyBERNHAUER(1944),E kobenslsandE.Japonlcus,are
consideredquestionableifactually occurringinChina,aswaspointedoutby UHLIG
andWATANABE(1992).
ExaminingthespecimensofChinesestaphylinids,Ihavefoundthreeinteresting
speciesbelongingtoErichsonlus.Theywereobtainedatthreedifferentlocalities,one
onMt.Miao'orShaninGuangxi,anotheratJiuzhaigouinSichuanandtheother from
near theTropicalBotanicalGardenatXishuangbannainYunnan.All thespecimens
were found fromunderdeadleavesaccumulatedat thesidesofstreams. Afteracareful
examination, ithasbecomeclear thatthesespeciesarenewtoscience. Theywillbe
describedinthepresentpaper. All thetypespecimensofthenewspeciestobede-
scribedaredepositedinthecollectionof theLaboratoryof InsectResources,Tokyo
UniversityofAgriculture.
Beforegoingfurther,IwouldliketoexpressmysinceregratitudetoDr.Shun-lobi
UENo,VisitingProfessoratTokyoUniversityofAgriculture, forhiskindadviceonthe
presentstudy.MythanksarealsoduetoDr. ToshioKlsHIMoTo,TokyoUniversityof
Agriculture,ProfessorYoshiakiN1sHIKAwA,0temonGakuinUniversity,andProfessor
MasatakaSAT0,NagoyaWomen'sUniversity, for theirkindnessinprovidingmewith
thespecimensusedinthisstudy.
Erichsonlus(Sectoph1io'tthus)nl'shikawaiY.WATANABE,sp nov.
(Figs.1,2,5-7)
Body length: 5.1-5.4mm (from frontmarginofhead to anal end); 2.6-2.8mm
(fromfrontmarginofheadtoelytralapices).
218 YasuakiWATANAIIF
Body elongate, nearly parallel-sided and somewhat depressed above. Colour
blacktoblackishbrown,moderatelyshining,withmandibles,antennae,elytraandab-
domenbrownishre paIpiandlegsbrownishyellow.
Male. Headquadrateandweaklyconvex,slightly transverse(width/length=
1.07)oraslongasbroad,postocularpartnearlystraightandabout1.9timesaslongas
thelongitudinaldiameterofeyewhichissomewhatprominentlaterally:surfacecov-
eredwithmicroscopicgroundsculpture,andsparingly,coarselyandsetiferouslypunc-
ture except forimpunctatevellexa1area,thepuncturesbecomingmuchcloserinthe
1atero-posteriorareathanintheotherareas.Antennaeelongate,extendingtonearthe
middleofpronotumandslightlythickenedtowardstheapicalsegment,basalsegment
polishe 2ndand3rdsubopaqueandtheremainingsopaque, 1strobustanddilated
apicad,muchlongerthanbroad(length/width=2.88),2ndsomewhat dilatedapicacし
apparently longer thanbroad(length/width=1.71),butmuchshorter(2nd/1st=0.52)
andalittlenarrower(2nd/1st=0.88)than1st,3rdelongate,about2.5limesaslongas
broad,somewhat longer (3rd/2nd=1.17)butdistinctlynarrower(3rd/2nd=0.80)than
2n 4th to 9th equal in length tooneanother, 4thapparently longer thanbroad
(length/width=1.67), distinctlyshorter (4th/3rd=0.71)butslightlybroader (4th/3rd
=1.07)than3r 5thequal inwidthto4th,6thto9thincreasinginwidth,eachlonger
than broad and slightly broader than 5th, 10th a little longer than broad
(length/width=1.13)andslightlyshorter(loth/9th=0.89)thanthoughasbroadas9th,
lithtwiceaslongasbroadandconsiderablylonger(11th/10th=1.78)thanthoughas
broadas9th,excavatedattheapex.
Pronotum convexmediallyand distinctly longer thanbroad (length/breadth=
1.13),clearlylonger(pronotum/head=1.20)thanthoughasbroadashead,widestjust
behindanterioranglesandthennarrowedposteriad; lateralsidesfinelybordere fee_
blyarcuateinanteriorhalvesandslightlyemarginateinposteriorhalves,anterjormar_
9insomewhatarcuate,posteriormarginsubtruncate,anterioranglesnarrowlyangulate
thoughnotvisiblefromdorsalside,posterioranglesrounded;surfacemoresparingly
andlesscoarselypuncturedthanonhea except foranarrowsmoothmedianspace
throughoutitslength,andcoveredalloverwithmoredistinctcoriaceousgroundsculp_
turethanonhead.Scutellumtriangular,closelywithsomewhatcoarsesetiferouspunc_
turesonthesurface.Elytrasubtrapezoida1anddilatedposteria distinctlylonger than
broad (length/width=1.10), much longer (elytra/pronotum=1.28) and apparently
broader(elytra/pronotum=1.31)thanpronotum;lateralsidesnearlystraight,posterior
mar9insomewhatemarginateatthemiddle,posterioranglesrounded;surfacedensely,
finelyandsuperficiallypuncturedandcloselycoveredwithfinebrownishpubescence;
hindwingsnormal.Legsrelativelyslender,protarsisomewhatwidened.
Abdomengraduallynarrowedtowardstheanalend,3rdto5thtergiteseachshat_
lowlyandtransverselydepressedalongthebase,lessdenselypuncturedthanonelytra
andcoveredwithfinebrownishpubescence,6thand7thtergiteseachmoresparingly
Coveredwithpuncturesandpubescencethanintheprecedingtergite;8thsterniteshat_
lowlyandsemicircularlyemarginateat themiddleofposteriormargin; 9thsternjte
NewE1・1し・/一_fisfromSouthernChina 219
Fig. 1. 1'lc1/so川11s(Score/)1/1/o,1r1/lls)Ill、.,/1以-allて11Y.WATAhAllE,sp nov.. 、 from Mt. Miao、er Shanin
Guangx、i China.Scale:1.0mm.
spatulate,distinctlynarrowedinapical fourthtowardstheroundedapex.surfacepro-
videdwithseveralshortsetae.
Genitalorgantrilobedandsymmetrical.Medianlobegraduallynarrowedapicad
inbasalhalfandsomewhatconstrictedatapical fourth,andthenabruptlytaperedto-
wardsthetipwhichisnarrowlyrounded:dorsalsurfaceprovidedwithalongitudinal
elevationalongthemedianlineexceptforapicalarea.Parameresslenderanddistinctly
longerthanmedianlobe eachsomewhatdilatedinapicalhalfand fringedwithanum-
berofblackishpegsetaeontheinner face.
Female. Similaringeneralappearancetomale,buttheistto4thprotarsa1seg-
220 Yasuaki WATANABE
Fi9s. 2-4. NinthabdominalstemitesinmaleofE,・!c1/sonius(Sectop11i/ont1/us)spp. - 2,E nl'shjka、vaj
sp nov;3, i.J11に/lalens1sspnov;4, .yll,1nan1lssp nov.Scale:0.25mm
mentsarelesswidenedandthe8thabdominalsterniteissimplyroundedatthemiddle
ofposteriormargin.
Typeseries. Holotype: Mt.Miao'erShan,aboveAntangPing,Xing'anxjan,
,
Guan9xi,China,24-V-1996,Y.NIsHIKAwaleg;allotype: Mt. Miao'erShan,Tian
,
Hu,Xin9'anXian,Guangxi,China,26-V-1996,Y.NlsHIKAwAleg.Paratypes:2
1!,Samelocalityanddateastheallotype,S.UENoleg;1(5、,3 ,samedataastheal_,
IOtype;19,Samelocalityastheallotype,26-V-1996,S.UEN0leg.
Distribution. China(Guangxi).
Remarks. ThepresentnewspeciesissimilaringeneralappearancefoE.sh1_
batai fromJapan,butisdifferentfromitinthefollowingpoints:headblackincolour,
withlateralsidesaml oststraight,surfacelesscoriaceous;pronotummorecloselyand
me「eSt「on9lyPuncturedexcept forasmoothlongitudinalspace,andmoredistinctly
CO「iaCeOuS;elytramorefinelypunctured;9thabdominalsternitejnmalemuchbroader
andP「ovidedwithfewersetaethanthoseofE.shibata1;malegenitalorganwjthme_
dian1obeleSSconstrictedbeforetheapex,parameresshorterthanthoseofE.shjbata1
Bionomics. Thetypematerialwasobtained fromunder deadleaves jndecjdu_
ouSbroadleavedforestsonMt.Miao'erShanataltitudesof1,830and1,g80m
Etymology. Thespecificepithetofthepresent newspecies isgjvena量or Dr
YOshiakiNISHIKAwA,whocollectedtheholotype.
s),. 「IC(cid:0)cruMS(Secfo加p7on加f s J加' zhafensf Y WATANABE s
nov.
(Figs3,8-10)
Body length:4.0-4.6mm(from frontmarginofheadtoanalend); 2.4_2.6mm
New E1・lc/1sonltlsfromSouthernChina 221
5 6 7
Figs.5-7. MalegenitalorganofE・lichso,1iusnlshikawa1spnov;dorsal view(5),lateralview(6),and
ventralview(7).Scale:0.5mm.
(fromfrontmarginofheadtoelytra1apices).
Bodyelongateandsomewhatdepressedabove.Colourblacktoreddishblackand
moderatelyshining,withantennaereddishbrown elytrablackish red thoughsome-
timesreddishbrownalongthesuture,palpiandlegsbrownishyellow.
Somewhatsimilar in faciestotheprecedingspeciesbut readily distinguishable
fromitbythebodysmallerandthepronotumlackingingroundsculpture.
Male. Head quadrate, nearly parallel-sided andgentlyelevatedmedially, as
longasbroad;lateralsidesalmoststraightthoughveryslightlyemarginatebehindthe
middle; eyessomewhatprominent laterally, thelongitudinaldiameter ofeacheye
aboutone-fourthaslongaspostocularpart;surfacesparinglyandstronglypunctured
exceptforimpunctatevertexa1area,thepuncturesbecomingcloserandcoarseronthe
1atero-posteriorpart,andcoveredwithmicroscopicgroundsculptureonvertexa1area,
whjchjssomewhat finer thanintheotherpart.Antennaemoderatelyelongate,extend-
ingtothemiddleofpronotumandslightlythickenedtowardstheapicalsegment,basal
segmentpolished,2ndand3rdsegmentssubopaque theremainingsopaque,1stseg-
ment robust anddilatedapica threetimesaslongasbroad,2ndconstrictedat the
base, apparently longer than broad (length/width=1.67), but considerably shorter
(2nd/1st=0.56)thanthoughasbroadas1st,3rdmorethan2.5timesaslongasbroad,
slightlylonger(3rd/2nd=1.20)butsomewhatnarrower(3rd/2nd=0.77)than2n 4th
twjceas longas broa(i, but distinctlyshorter (4th/3rd=0.67) andslightly narrower
(4th/3rd=0.87) than3rd,5thequal inlengthtothoughalittlebroader(5th/4th=1.25)
222 YasuakiWATANABE
than 4th, 6th somewhat longer than broad (length/width=1.30), a little shorter
(6th/5th=0.88) butslightly broader (6th/5th=1.08) than5th,7thalittlelonger than
broad (length/width=1.33), somewhat longer (7th/6th=1.l4) and slightly broader
(7th/6th=1.11) than6th,8thequal inbothlengthandwidth to7th,10thas longas
broa as longasthoughslightly broader (10th/9th=1.14) than9th, 11thdistinctly
longer than broad (length/width=1.38), somewhat longer (11th/10th=1.38) than
thoughasbroadas10th,excavatedattheapex.
Pronotum nearly oblongandelevatedmedially, apparently longer than broad
(length/width=1.21),distinctlylongerthan(pronotum/head=1.21)thoughasbroadas
head; lateralsidesslightlyarcuateinanteriorhalvesthoughstraightorslightlyemar-
ginateinposteriorhalves,anteriormarginarcuate,posteriormarginrounded,anterior
angles narrowly rounded though not visible from above, posterior ones broadly
rounded;surfacesparingly,coarselyandsetiferouslypunctured,except foranarrow
smoothlongitudinalspacethroughout thelength,butgroundsculpturealmost indis-
tinct.Scutellumsubtriangular,providedwithfinesetiferouspunctures.Elytrasubtrape-
zoida1,somewhatdilatedposteria alittlelongerthanbroad(length/width=1.11),dis-
tinctlylonger(elytra/pronotum=1.24)andapparentlybroader(elytra/pronotum=1.36)
thanpronotum;lateralsidesalmoststraight,posteriormarginemarginateatthemiddle,
posterior anglesrounded;surfacecloselycoveredwithfineandsuperficialpunctures
andfinebrownishpubescence.Legsrelativelyshort,similartothoseofthepreceding
species.Hindwingsnormal.
Abdomenparallel-sidedfrom3rdto6thsegmentsandthenabruptlynarrowedto-
wardstheanalend,3rdto5thtergiteseachshallowlyandtransverselydepressedalong
8 10
Figs. 8-10. Malegenitalorganof i,・lc1/so川11s/11に1/a1e11s1sspnov;dorsalview(8),lateralview(9),and
ventralview(10).Scale:0.5mm.
New11・lc/lso1111lsfromSouthernChina 223
thebase,closelyandveryfinelypuncturedandcloselycoveredwithfinebrownishpu-
bescence,7thand8thsterniteseachmoresparinglypuncturedandpubescent thanthe
precedings,8thsterniteshallowlyandsemicircularlyemarginateat themiddleofpos-
teriormargin;9thsternitesimilar informtothatoftheprecedingspeciesthoughpro-
videdwithmorenumeroussetae.
Genitalorgantrilobedandsymmetrical.Medianlobeabruptlynarrowedapicadin
apicalsixth;dorsalsurfacefinelyandlongitudinallycarinatealongthemiddle, theca-
rinaabbreviatedinbasalhalf.Paramereselongate,slightlyshorterthanmedianlobe,
eachmoreorlessdilatedinapicalpartandlackingpegsetae.
Female. Similarinfaciestomale,thoughtheistto4thprotarsa1segmentsare
not wjdene andtheabdomenwiththe8thsternitebroadlyroundedatthemiddleof
posteriormargin.
Typeseries. Holotype: . allotype: Jiuzhaigou,Jiuzhaigou Xian, Sichuan,
,
china, 30_VIII-1998, M.SAT01eg. Paratypes: 4 ,same locality anddateasthe
holotype,T.KlsHIMoToleg;3 ,samelocalityandcollectorastheabove,28-Vill-
i998.
1sfrlbz,f en. China(Sichuan).
Bio1,omlcs. Thetypematerialwasobtained fromunderdeadleavesinamixed
forestatJiuzhaigouatanaltitudeof2,100m.
Etvmo1o‘gy. Thespecificnameofthisnewspeciesisderived fromthetypelo-
cality“Jiuzhaigou”.
Erichsonl'us(Sectop1li1ont11us)JMltnallusY.WATANABE,Sp nov.
(Figs4,11-l3)
Body length:3.8-4.2mm(fromfrontmarginofheadtoanalend):2.1-2.4mm
(fromfrontmarginofheadtoelytra1apices).
Body elongateand subpara11e1-sided. Colour black todark reddish black and
moderatelyshining,withantennae,exceptforyellowishbrown1stsegment,tibiaeand
tarsireddishbrown,palpi,coxaeandfemorayellowishbrown.
Male and female. Somewhat similar in colour and facies to thepreceding
speciesbutdifferent fromitinthefollowingpoints:
Headsomewhatmoreevenlyelevatedmedially,surfacemuchmorecloselyand
morefinelypuncture thepuncturesbecomingsparserandcoarserasinthePrecedin9
specjes,thoughlackinggroundsculptureinfrontalarea;eyesrelativelylarge,the1on-
gjtudjna1djameterfjve-sixthsaslongaspostocularpart;pronotummoredistinctlyna「一
rowedposteriad,lateralsidesmorestronglyemarginateinposteriortwo-thirds,surface
muchmorecloselypuncturedexcept foranarrowsmoothlongitudinalspace,elytra
relatively long (length/width=1.14), distinctly longer (elytra/pronotum=1.40) and
broader(elytra/pronotum=1.36)thanpronotum,surfacemorecloselyandmorefinely
punctured;abdomenlesscloselyandsomewhatmorecoarselypunctured;inmale 8th
sternitemorebroadlyandmoreshallowlyemarginateat themiddleofposteriormar-
224 YasuakiWATANABE
.・-、、 /'ll、
、l
ll
:
、、-・-・-/_-,、、-、、l、.、一,・,
---' 11 12 1、、:l.,・/ 13
Figs. ll-13. MalegenitalorganofEl・1chso川usyun,1anussp nov;dorsal view(11),lateral view(12),
andventralview(13).Scale:0.5mm
gin; 9thsternite nearly elliptical, moregently narrowed apica posterior margin
slightlyemarginateatthemiddle.
Malegenitalorgantrilobedandsymmetricalasthatoftheprecedingspecies;me-
dianlobeslightlynarrowedapicadthoughabruptly dilatedbeforetheapexwhich is
producedintoaspearhead, dorsal surfaceprovidedwitha fine longitudinal carina
alongthemiddleinposteriorhalf;parameresslenderandaslongasmedianlobe,each
slightlywidenedbeforetheapexandlackingpegsetae.
Typeseries. Holotype: ,allotype: bankoftheLuosuo-jiangRiver,near the
,
Tropical BotanicalGarden, Menglun,Mengla, Xishuangbanna,SW.Yunnan,China,
30-X-1992,Y.WATANABEleg.Paratypes:3 ,19,samedataastheholotype.
Distribution. China(southwesternYunnan).
Biono'rues. Thetypematerialwasobtained fromunderdeadleavesaccumulated
onariverbankatanaltitudeofabout570m.
Etymology. Thespecificepithetofthisnewspeciesisderivedfrom“Yunnan”in
whichliesthetypelocality.
要 約
渡辺泰明:中国南部から採集されたヒメホソハネカクシ属 (甲虫目ハネカクシ科) の3新
種. - 中国からは, これまでにヒメホソハネカクシ属に含まれる5種が報告されている. し
NewErichso1t11lsfromSouthernChina 225
かし, そのうちのツー'''ヒメホソハネカクシおよびクロヒメホソハネカクシの2種の分布記録は,
UHLIG&WATANABE(1992)によって疑問視され, それぞれ近縁の未記載種である可能性が指摘さ
れている. 私は手許にある中国産ヒメホソハネカクシ属に含まれる3種を検討した結果, いず
れも未記載種であることが判明したので, 下記のとおり命名・記載した.
1). 1. i''lc1/s0川11s(Secu0p/11/011f/Ills川 s/Ilia- Y WATANAB
この種は, 广西壮族自治区苗儿山の標高1,830mおよび1,980mの地点で, 落葉広葉樹林の林
床に堆積した落葉層から採集された. 概観は日本から記載されたE.s/,ibataiに類似しているが,
頭部は黒色で, 両側は直線に近く, 表面の微細構造はより弱いこと, 前胸背板はより密に, よ
り強く, また, 翅鞘はより細かく点刻されること, 雄の第9腹板ははるかに幅広く, 交尾器の
形状も明らかに異なることによって容易に区別される.
2. irlc1/s0川11s(Sec「0p1/1/On「1111s)J1にl /tale'IsisY.WATANABE
0^, 本種は, 四川省北西部の九寨、fの 標高2,10 のm地点で 広 葉樹と針葉樹の混交林の林床に
堆積した落葉層から採集された. 外部形態は前種に類似しているが, やや小型で, 前胸背板に
は微細印刻が認められず, 雄交尾器の中葉ははるかに幅が広く, 先端が突出し, 側葉は黒色の
pegsetaeを欠いていることで区別される.
3. i''lc1/son加s(Sec1op1/1/onf1/lls)y1lnna川IsY.WATANABE
云南省西双版納熱帯植物園の脇を流れる 梭江の水際で採集された本種は, 色彩および外部
形態が前種に類似しているが, 頭部は微細印刻を欠き, 点刻はより密で, より細かいこと, 前
胸背板はより強く後方に狭まり, 表面の点刻ははるかに密であること, 翅鞘の点刻はより密で,
より細かいこと, 雄の第9腹板はほぼ楕円形で, 後縁中央が弱く湾入していること, 交尾器の
中葉末端の形状が異なることなどによって区別される.
References
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UHLIG,M.,& Y.WATANABE, 1992. RevisionoftheJapanesespeciesofthegenusE''tc11soniusFAUvEL
(Coleoptera,Staphylinidae,Phi1onthini). Mitt.二00/.Mtls.Bell.,68:3-92.
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