Cotasteromorphus, a New Cotasteromimina (Coleoptera, Curculionidae, Molytinae, Pissodini) from the Malaysian Moss Forests

2005·4.2 MB·

by  Kojima, H

Elyt,・a,「okyo,33(1):134-141,May30,2005
Cotasteromorphus,aNewCotasteromimina(Coleoptera,Curculionidae,
Molytinae,Pissodini)fromtheMalaysianMossForests1)
Hiroaki KoJIMA
TheKyushuUniversityMuseum,KyushuUniversity,
Fukuoka,812-8581Japan
and
IDRlsAbd.Ghani
CentreforInsectSystematics,NationalUniversityofMalaysia,
43600UKMBangi,Malaysia
Abstract Cotaste,,o,no1p/nlschuJo1gen et.sp nov. isdescribed from the moss
forestsoftheCameronHighlands,Pahang,Malaysia.Thegenusbelongstothesubtribe
Cotasteromiminaof thetribePissodini,andissimilarto Cotaste,-omimusCHOJ0etVoss,
1960 described from Japan.Weevilsarecommonlyfoundon theshrubsbybeatingat
thetypelocalities,andinterestinglythesexesareratherbiasedto female(male:female=
1:l3).
Inthemountainousmoss forestsof theCameronHighlands, Malaysia,ween-
countermanyapterousbeetlesonshrubs. InGunungBrinchang,thehighestmountain
inthearea(alt 2,032m)itisquitediverseinsuchapterousformsandtheyincludethe
families Dryopidae, Colydiidae, Tenebrionidae, Cerambycidaeand the superfamily
Curculionoidea.Amongthem,weevilsarepredominantinthenumberofspecies.They
areChoraginaeofAnthribidae,StromboscerinaeofDryophthoridae,andCryptorhynchi-
nae, MolytinaeandEntiminaeofCurculionidae, andmost of thembelong to the
Molytinae.
Inour fourthstudydealingwithsuchapterousMalaysianweevils(KoJIMA&Mo-
RIMOT0, 2002; KOJIMAet a1., 2003; KoJIMA & IDRIs, 2003), anew genusofCotas-
teromiminaofMolytinae:Pissodini isestablished foranewspeciescollectedonthe
shrubscoveredwithlichensinthemossforestsbybeatingmethods.Theweevilresem-
blesCotasterom11mtsdescribedfromJapanbyCHOJoandVoss(1960).
WethankDr.K.MoRIMoTo forhiscriticalreadingofthemanuscriptandDrs.S.
NOMURA, K. YOSHlzAwA,N.TAKAHAsHlandMr. M. Y. RUsLAN for theirkind favor in
I)ThisstudyissupportedbyKAKENHI(14255016)(Headinvestigator:Dr.0.YATA)
NewCotasteromiminafromMalaysia 135
manyWays.TheSeniorauthoralsothanksDrs.C.W.0'BRIEN,K.MATSUMOTOandT.
NONAKAfortheirkindofferofmaterials.Abbreviationsusedinthisstudyareas fol_
lows:CWOB:C.W.0'BRIENcollection,Florida;ELKU,EntomologicalLaboratory,
KyushuUniversity;KUM:TheKyushuUniversityMuseum,FukuokaandUKM:Uni_
versitiKebangsaanMalaysia,Bangi.
Cotasteromorp/1usKoJIMA,gennov
(Figs.1-23)
1 Typespecies:Cotaste1'omorp/ufscﾝz,o ge etsp nov.
Dermoftencoveredwithwaxylayeror incrustation, andclothedwithdecurved
subrecumbentscales.
Headseparated frombaseofrostrumbyimpression,topofeyelyingaboutmid-
dleofbaseofrostruminlateralaspect.Rostrumcurved,shorterthanpronotum. An-
tennaeinsertedbeforemiddleofrostruminbothsexes;scapenotreachingeye,funicle
7-segmented,clubovate.
Prothoraxtruncateatbase,withpostocularlobes.Scutellumabsent.Elytrawith-
outhumeralcallus;stria tealmost abbreviatedbeyondhindcoxa. Hindwingsabsent.
Pygidiumconcealed.Legswithfemoraeacharmedwithasmalltooth;tibiaeuncinate,
premucroindistinct;tarsiwith3rdsegmentverybroad,butnotbilobate,5thnearlyas
longasbasalthreesegmentscombined;clawssimple, free.
Prosternumwith forecoxaenarrowlyseparated;mesosterna1processabouthalf
aswideasmiddlecoxa;metasternumshorter thanmiddlecoxabehind it;metepister-
invisible. Metendosternite transverse, anterior tendonswidely distant, each lo-
num
catedonmiddleof furcalarm, lateralarmindistinct.Venter with intercoxa1process
broadlysubtruncate,widerthanhindcoxa,2ndsegmentnearlyaslongas1stbehind
coxa,andaslongas3rdand4thsegmentscombined.
Terminaliaasinfigures(Figs.10-12formale;Figs.13-23for female);aedeagus
withslit laterally;tegmenwithparameres;sternite8paired;spiculumgastraleasym-
metrical.
Etymology. FromresemblancetoCotaster,acossonineweevilgenus,asCotas-
teromlmuswasnamedafterit,andmasculine.
Comments. Cotaste1-omorphusresemblesCotaste1o'mimusCHUJOetVOSS,1960
knownfromJapan,KoreaandTaiwan,andbelongstothesubtribeCotasteromiminaof
thetrjbepjssodiniaccordingtothedefinitiongivenbyMoRIMoTo(1962):eyespartly
concealedbyanteriormarginofpronotum;postocular lobemoreor lessdeveloped;
prosternumflat; forecoxaemoreorlessseparated;scutellumo量onindistinct;tibiae
uncjnateandabdominalprocessbetweenhindcoxaesubtruncate,nearlyasbroadas
136 HiroakiKoJIMAandlDRIsAbd.Ghani
coxa.TwogeneraarepreviouslyknownintheCotasteromimina,andCotasteromor-
phusiseasilyseparablefromthembythefollowingkey:
1(2) Antennaewith funiclevisibly6-segmented.Elytrawithrectangularshoulders;
hindwingsdeveloped.Legswithfemoraedentate;tibiaewithpremucroindis-
tinct;tarsiwith3rdsegmentnotbilobed. ...Pseudohy1oblusMORIMOTo,1962
2(1) Antennaewith funicle7-segmented.Elytrawithshouldersroundedorindistinct.
3(4)Elytrawithshoulders indistinct; hindwingscompletelyatrophied. Legswith
femoradentate; tibiaeeachwithpremucroindistinct; tarsiwith3rdsegment
notbilobed Cotasteromorp11usgen nov.
4(3)Elytrawithshouldersvariablefrompresenttoindistinct;hindwingspresent,but
reduced insizeifshouldersareindistinct.Legswith femoraedentate; tibiae
eachwithpremucro;tarsiwith3rdsegmentbilobed
Cotaste1'omimusCHUJ0etVOSS.1960
Thefeaturessuchasthenon-bilobed3rdtarsalsegmentandthedentate femora
seeninCotaste1-omorphus1ooklikethoseofanotherapterousmolytinegenusPinaco-
pusMARSHALL,1932occurringsympatrically.However,thebody ismuchsmallerthan
inPinacopus,andtherostrumisconstrictedatthebaseandthepremucroofeachtibia
isundevelopedinCotasteromorphus.Theaedeaga1feature,whichhasaslitlaterallyis
alsosharedbetweenCotaste1,omorphusandPinacopus.Thisisanunusual featureseen
in CotasteromimusCHUJoet Voss, 1960 (MoRIMoTo & MIYAKAwA, 1985), Seleuca
PAscoE, 1871 (MoRIMoTo, 1982) and 011bazo MoRIMoTo, 1961 (MoRIMoTo &
MIYAKAwA,1985) asfarasweknow.AmongthemSeleucaandOtlbazodiffer from
others inhaving thecontiguousprocoxaeandarenowclassified in the Lithinini and
Anchonini intheMolytinae, respectively.PresentlyPi,1acopusisclassifiedinthetribe
Molytini(ALoNso-ZARAzAGA& LYAL,1999),butthefeaturesseeninPinacop1,tsmay
indicate the affinity with Cotasteromimina in the tribePissodini and the position
shouldbereinvestigatedinthefuture.
CotasteromorphuschujoiKoJIMA,sp nov.
(Figs.l-23)
Male. Length:1.7-2.1mm;width:0.9-1.0mm.
Dormdarkbrowntoblack,antennalscape,uncioftibiaeandclawspaler,some_
timesrostrum,antennaeandlegsdarkreddishdrown.
Headwithdensesmallpunctures,eachwitha nerecumbentscalyhair, forehead
betweeneyeswiderthanbaseofrostrum.Rostrum0.8timesaslongaspronotum,dor_
sumwith fiverowsofcarinaebehindantennal insertion, interveningareabetween
themwithdecurvedsubrecumbentscales.Antennaeinsertedatapical1/3ofrostrum;
scapenearlyaslongasfunicle; funiclewith1stsegment15timesaslongasbroad,
2nd3/5timesaslongas1st,3rdto7thsubequa1inlength,abouthalfaslongas2nd;
clubaslongasbasalthreesegmentsoffuniclecombined.
NewCotasteromiminafromMalaysia 137
CI
7
Figs. 1_12. cotaste,-omo,pilusc1/uJoigenetsp nov. - 1,Habitus, female;2,ditto,vent「al;3,ditto,
lateral;4,femoraandtibiae;5,head,female;6,ditto,male;7,antenna;8,foretibia;9,fo「eta「SuS;10,
aedeagus;11,tegmenandparameres;12,tergite8,sternite8andspiculumgastrale. Scale=0.5mm,
barAfori:Bfor2.3;Cfor4,Dfor5,6;Efor7-12.
138 HiroakiKoJIMAandIDRlsAbd.Ghani
prothoraxaslongasbroa broadestatmiddle;discwithshallowpunctures,each
withadecurvedsubrecumbentscales,someofwhicharebifidorbranchedatapex.
Elytra1.2-1.3timesaslongasbroa broadestatmiddle;striaerugoselypunctatenear
base,puncturesbecomingweakerandsmaller towardapex; intervalswithdecurved
subrecumbent tosuberectscales, whichareoftenirregularly approximated to form
clusters.Legswithdecurvedrecumbenthairyscales.
Prosternumasshallowlypunctateaslateralsidesofprothorax;presternalprocess
and sterne11um impunctate. Mesosternum shiny, separately punctate; mesosterna1
processdenselypunctate,eachwithadecurvedsubrecumbentscale.Metasternumwith
a transverse rowofpunctures,eachpuncturewithadecurvedsubrecumbentscale.
Venter with 1st ventrite weakly depressed at middle, 1st, 2nd and 5th ventrites
minutelypunctate,eachpuncturewithafinerecumbenthair,3rdand4thventritesal-
mostimpunctate.
Malegenitaliaasillustrated(Figs.10-12),innersacwithcomplexsclerites;para-
meresreduced insize.
Female. Length:1.7-2.5mm;width:0.8-1.3mm.
Verysimilartomale,exceptventerwith1stventritenotdepressedatmiddle.
Femalegenitaliaasillustrated(Figs.13-23),bursacopulatrixwithaweaklyscle-
rotizedplateatjunctionofbaseofspermathecalduct;sternite8variesfromsimpleto
dividedat base.
Etymology. ThenameisdedicatedtothememoryofthelateDr.MichioCHuJo,
whowas aneminentJapanesecoleopterologist andcontributedtothe taxonomy of
beetlesincludingweevils.
Holotype: (UKM),PeninsularMalaysia:Pahang,GunungBrinchang,Cameron
Highlands,27-III-2002,H.&M.KoJIMA.
Paratypes. Peninsular Malaysia: Pahang, Cameron Highlands 2!, 27~28-
VIII-1990, T. NONAKA (KUM). 2e, same locality as holotype, 17-V-1973, S.
MIYAKAWA(ELKU);3e,30-IV-1990,K.MATSUMOTO(KUM);5e,19-VII-1995,H.
KOJIMA (UKM & KUM); 2e,10!, 11-III-2003,H. KoJIMA(UKM & KUM). 3e,
21!,samedataasholotype(UKM&KUM);39,13-VII-2003,N.TAKAHAsHl(UKM
& KUM). 3!, Brinchang, Tr 3 (1,457m), 16-VII-1992, C.W. & L.B. 0'BRIEN
(CWOB);1e,Tr iO-12(1,457m+),29-VII-1992,C.W.&L.B. 0'BRIEN(CWOB);
179,Tr.11(1,457m+),18~19-VII-1992,C.W.&L.B.0'BRIEN(CWOB);39,Tr 2
(1,500m), 17-VII-1992, C. W. & L. B. 0'BRIEN(CWOB); 13e, Arcadia Trail 3
(1,450m), 31-VII-1992,C.W. & L. B. 0'BRIEN(CWOB). 6 Tanah Rata, Trail 7
(1,350m+), 30-VII-l992, C. W. & L. B. 0'BRIEN (CWOB,). Ie, Tanah Rata,
Figs.13-22. FemaleterminaliaofCotaste1-o,no,phuschtl/o1gen etsp nov. - l3,Genitalia,lateral;
14,scleriteofbursacopulatrix,ventral;15-18,spermatheca;19-23,sternite8,ventral(13,14,16,19,
20:specimensfromG.Brinchangwithclustersofscalesonelytra1intervals;15,23:specimenfromG.
Brinchangwithscalesarrangedregularlyonelytralintervals;17,21:specimenfromG.Beremban
withclustersofscalesonelytra1intervals;18,22:specimenfromG.Jasarwithscalesarrangedregu-
larlyonelytralintervals). Scale=0.25mm.
NewCotasteromiminafromMalaysia l39
14
16 17 18
ノ・
1
11
、
ノ
22
140 HiroakiKoJIMAandIDItlsAbd.Ghani
30_VIII-1990, T. NoNAKA (KUM). 1 5 GunungJasar,25-IV-1990, K. MATSU-
, ,
MOTO(KUM); 29, 19-IX-1990, T. NoNAKA (KUM); 1e, 29-IX-1990, T. NONAKA
(KUM);19,21-II-1992,K.MATSUMOTO(KUM);1e,159,20-VII-1995,H.KOJIMA
(UKM &KUM); Ie,1!, 11-XII-1998,N.TAKAHAsHI (KUM); 4e, (alt1,600m),
14-XII-1998,H. INouE(KUM).3 G.Jasar-G.Perdah,28-III-2002,H.& M.Ko-
,
JIMA(KUM);3e,9-III-2003,H.KoJIMA(UKM&KUM).1!,TanahRata-G.JaSa「,
28-III-2002,H. &M.KoJIMA(KUM).3!,GunungBeremban,26~28-II-1992, K.
MATSUMOTO(KUM);2e,149,22-VII-1995,H.KOJIMA(KUM).
Distribution. PeninsularMalaysia(Pahang).
Comments. Two formswererecognizedinthescaleconditionofelytra1inter-
vals:oneisthatthescalesarearrangednearlyregularlyineachintervalandtheother
isnotsoandscalesareirregularlydisposedto formclustersasisillustrated(Fig.1).
Initially,weconsideredthattheyaredividedintotwospecies.Theyareoccurringsym-
patrica11y,andone formhasbothsexes,buttheother isrepresentedbyonly female
thoughanumberofspecimenswereexamined.Thus,wecomparedfemalegenitaliaof
bothformsandtheywerenotdistinguishedfromeachotherexcept forthescalecondi-
tion.Wethereforeconcludedthattheseformsmaybeintraspecificvariations.
It is interesting thatthesex ratio isextremelybiased to female(male:female=
1:13)inthisspecies.
要 約
小島弘昭・A.G. IDRls:マレーシアの重華苔林から発見されたッチイロソ゛ウムシ亜族 (和名新
称) の1新属. - マレ一半島キャメロンハイランドの藤苔林から得られた, キボシソ゛ウムシ
族ツチイロゾウムシ亜族に含まれる新属新種のゾウムシを故中條道夫博士に献名し, Cotaste1・o-
mo1phuschuJolgenetspnov.として命名・記載した. 本属は, CHuJo&voss(1960)により日本
から記載されたCotaste,・omlrm,s属に似ているが, 上翅の肩が張り出さず, 後翅が完全に退化し,
腿節には歯状突起を有し, 付節第3節が, 2葉状にならない点などでCotaste,・o,n,,m,s属とは容
易に区別できる. 本種は, 基準産地では蘇苔類に覆われた灌木から叩き網で比較的普通に得ら
れる種で, 多数の標本を検したが性比が著しく雌に偏つてぃた.
References
ALONS0-ZARAZAGA,M.A.,&C.H.C.LYAL,1999. AWorldCatalogueofFamiliesandGeneraofCur_
CuliOnOidea(Insecta:Coleoptera)(ExceptingScolytidaeandPIatypodidae).315pp.Enlomopraxjs,
Barcelona.
CHOJo, M., & E. VOSS, 1960. Neue Curculioniden-Subfamilie, -Gattungen und -Arten von Japan
(ColeOptera,Curculionidae). Mom.Fac.lib.Al・ts&Educ.,Kaga、l,aUn、i ,(2),(94):1_17
KOJIMA, H., & K. MORIMOTo, 2002. StudyontheMalaysianPinacopus(Coleoptera,Curculjonjdae,
Molytinae). Spec.Bull.Jpn.Soc.Co/eopte1・01.,「oleo,(5):425_445
- , - & A・G. IDRIS, 2003. Notes on the apterous weevil genusPinacopils MARSHALL
(ColeoPtera,Curculionidae,Molytinae). Spec.Bu//.Jpn.Soc.Co/eopte・,o/.,To(kyo,(6):405_413
- & A. G. IDRIS, 2003. A peculiarnewspeciesofthegenusAntlnlaPAscoE(Coleoplera: cur_
NewCotasteromiminafromMalaysia 141
CuliOnidae:Entiminae)fromMalaysianmossforests,withnotesonthesympatricweevilsandbeetle
ofsimilarappearance. So,a,lg1ga,8:73-82.
MORIMOTo, K., l962. Keytofamilies,subfamilies,tribesandgeneraofthesuperfamilycurculionojdea
ofJapanexcludingScolytidae,PlatypodidaeandCossoninae. J Fac.Agric.,Kyushu Unjv,12:21_
66.
- 1982. ThefamilyCurculionidaeofJapan.1.SubfamilyHylobiinae. Esakia,Filkuoka,(lg):51_
l21.
- & S. MIYAKAWA,1985. Weevil faunaoftheIzuIslands,Japan(Coleoptera). Mushi,Fukuoka,
50:19-85.