A New Species of Leptaulax (Coleoptera, Passalidae) from Borneo

6 Pages·2003·3.6 MB·

by  Johki, Y

Elyt,a,To(kyo,31(2):385-390,November22,2003
ANewSpeciesofLeptaula:x:(Coleoptera,Passalidae) fromBorneo
YutakaJoHKI
GraduateSchoolofHumanLifeScience,ShowaWomen'sUniversity,
Taishido1-7,Setagaya,Tokyo,154-8533Japan
KunioARAYA
GraduateSchoolofSocialandCulturalStudies,KyushuUniversity,
Ropponmatsu4-2-1,Chuo-ku,Fukuoka,810-8560Japan
and
Masahiro KoN
GraduateSchoolofEnvironmentalScience,TheUniversityofShigaPrefecture,
Hassaka-cho2500,Hikone,Shiga,522-8533Japan
Abstract AnewspeciesofLeptat1/axisdescribedfromSabahandSarawak,Bor-
neounderthenameofL.11idakalspnov.Thepresentnewspeciesischaracterizedbyhav-
ingmatelytralside,andiscloselyrelatedtoL becca,・iifromSumatra.However,itcanbe
distinguishedfromLbecca・l11byhavingthefollowingcharacters:thebodylarger(24mm
ormore),flatter(theratioofprothoraxthicknesstopronotumwidthlessthan0.49).Akey
jsalsoprovidedIotheLeptau/axspeciessharingthecharacter,thesideofelytronmat.
Mostpassalidspecies(Coleoptera,Passalidae)haveentirelypolishedelytraex-
ceptinthepuncturesofelytra1grooves.However,somepassalidspecieshavethelat-
eralgroovesoftheelytronmat(GRAVELY,1918).ThegenusLeptaulaxalsoincludes
fivespecieshavingmatelytra1grooves: i.e., L anna ZANG, L beccarii KuWERT, L
humerosusKUwERT,Lmasay1lki1IwAsEandL.schi11hammeri IWASE(GRAVEIY,1918;
IwAsE,1997,1998).
DurjngthecourseoftheentomologicalsurveyinSabah,Borneoin1981,thefirst
authorcollectedonebeetleofthegenusLeptaula)cfromMamut,nearMt.Kinabalu.
Thjsbeetlehadtheelytronwithmat lateralgroovesbutappearedtodiffer fromany
knownLeptaula:c)speciessharingthischaracter.Laterwehadopportunitiestoexamine
someadditionalspecimensofthisformfromSarawakaswellasfromSabah.Aftera
carefulexaminationofthesespecimens,weconcludedthatthisformisnewtoscience.
Thus,wearegoingtodescribeanewspeciesofLeptaula)cbasedonthespecimens
fromSabahandSarawak.
386 YutakaJol-lKl,KunioARAYAandMasahiroKoN
Indescribing thepresentnewspecies,weadopt theterminologyofGRAVELY
(1914)andIwAsE(1996)forexternalmorphologyandLINDRoTH(1957)formalegeni-
talia.
LeptaulaxltidakaiJoHKI,ARAYAetKoN,sp nov.
(Figs.1-4)
Description of holotype. Male. Length from apical margin of clypeus to
apicesofelytra24.0mm. Bodyflat, ratioofprothoraxthicknesstopronotumwidth
0.47,polishedexceptsideofelytron;head,pronotum,prosternum,elytra, tibiaeand
tarsiblack;mesosternum,metasternum, abdominalsternitesandcoxaedark reddish-
brown
Outermarginofmandiblewithastronganglenearbase,almoststraightinmiddle
portionanteriortoouterangle,stronglycurvedinwardsindistalportion;anteriorlower
toothtriangular,withapexrounde slightly largerthanlowest terminal tooth,theleft
oneslightlylargerthantherightone.Labrumpuncturedandhairy,weaklyasymmetri-
cal,withleftanteriorangleslightlymoreprominent forwardsthantherightone,ante-
riormarginconcave, lateralmarginsweaklydivergedanteriad.Innermarginal tubercle
slightlylargerthanouterone,withapexrounded;distancebetweeninnertubercles18
Fig. 1. HabitusofLeptau/a:l;hldakai
sp nov.,scale5mm.
New Leotatl/a、- from Borneo 387
Fig.2. Headof op'ail/at-/11da/,,alspnov.,scale2mm
timesaslongasthatbetweeninnerandouterones;outermarginaltubercletriangular;
mediantuberclesmallandobtuse.Canthusweaklypuncturedondorsalsurface,with
anterior anglerounded. Eye large,projectinglaterally beyond canthus. Frontalarea
pentagonal,wider thanlong,hairless,withlargeannularpunctures,mediankeel indis-
tinct;depressedareasanterior toparietal ridgeandbetweenparietalandsupraorbital
ridgeswithlargeannularpunctures;areasbehindouter tubercleandbehindparietal
ridgeimpunctate;parietal ridgeshort,abruptlyending,notextendingtosupraorbital
ridge;supraoccipital ridgeindistinctandpuncturedindistalportion.Mentumsmooth,
polishedandwithJ-shapedscarincentralportion,withlargehair-bearingpuncturesin
lateralportion, roundedatanteriorendoflateralportion,concaveinposteriormargin.
Hypostoma1processsmooth,polished,withoutgroove.
Pronotum at, rectangular, densely punctured in lateral portion, with anterior
angleweaklyprominent forwards,posteriorangleweaklyrounded,mediansulcusdis-
tinct, latera1scarshallow.Prosternumsmoothandwitha fewhairsinmiddleportion;
posteriorplateofprosternumrugoseand-finelypuncturedincentralportion,polished
onposteriorborder.Mesothoracicepisternummat;mesosternumsmoothandimpunc-
tateincentralportion,withbroadlateralscar,mat inscar.Centralareaofmetasternum
polished, impunctate,withshallowdepressionbetweenmesocoxae;anteriorintermedi-
ateareaentirelypuncturedandhairy;posterior intermediateareapuncturedininner
andposteriorportions,impunctateinouterportionclosetolateralarea;lateralarearu-
gose,welldefined,narrow,slightlywidenedposteriad.
Elytron atondorsalsurface,slightlywidenedposteriad,hairyathumerus,mat in
seventhtotenthgrooves,withtransversepuncturesinlateralgrooves.
Abdominalsternitesentirelypolishedexcept forvisiblethirdand fourthsternites
depressedandmatinanteriorportion.
Lateralsurfaceof front tibia at,somewhatdepressed,polished,withhair-bearing
punctures;lateralsurfaceofmiddletibiapolishedexceptinpunctures.
388 YutakaJoI-IKI,KunioARAYAandMasahiroKo
Figs 3-4 Malegenitaliaof Leptaula:-;l hidaka1sp nov.,scale500ｵm;3,ventral view;4,rightlateral
view
Penislarge,roundedindistalen longerthanparameresinthemiddleofventral
side;parameresconnectedwitheachotherbothondorsalandventralsides,broadened
towardsdistalendinlateralview,withlateralportionstronglyextending forwardsin
ventralview;basalpiecesmall,muchshorterthanparameres.
Variation. Nosexualdimorphismisevident.Measurements forparatypes from
Sabah:bodylength(mean±SD,range)25.0mm±0.87,24.5-25.8mm(N=3);theratio
of prothorax thickness to pronotumwidth (mean±SD, range) 0.476± 0.004, 0.471-
0481.
.
Typeseries. Holotype: , Mamut near Mt. Kinabalu, 1,000m in alt., Sabah,
13-VIII-1981,Y.JoHKl leg.Paratypes:1 Mt. Kinabalu,ParkHeadquarters,1,300m
,
inalt.,Sabah, 16-IV-1987, A.UEDAleg; 1 CrockerRange,1,600minalt.,Sabah,
,
27-VIII-1987, M. KoN leg; I Sayap, Mt. Kinabalu, 1,000m in alt., Sabah,
,
13-V-1992,H.SADAMoRl leg;2exs.,BaramRiver,Sarawak,4 &24-X-1920,J. C.
Mou_lTONleg. (inthecollectionoftheNaturalHistoryMuseum,London). Theholo-
typeisdepositedinthecollectionoftheInstituteforTropicalBiologyandConserva-
tion,UniversityMalaysiaSabah.
Etymo1o1gy. ThepresentnewspeciesisnamedinhonorofProf.EmeritusToshi-
takaHIDAKA,whogaveusopportunitiestoperformresearchesinBorneo.
Notes. ThepresentnewspeciesresemblesLeptaula)cbecca,11fromSumatrabut
differs fromthelatterinhaving thecombinationofthe followingcharacters:thebody
larger,24mmormoreinlength,whereasinL beccari1, it is22mmorless;theprotho-
raxflatter,theratioofprothoraxthicknesstopronotumwidthlessthan0.49,whereas
inL beccarii,it ismorethan0.52.
TheholotypeandtwoparatypesfromSabahwerecollectedbylight.
Specimenscompaled Leptaula)canna: 2 Ruteng,Flores,XII-1989. L bec-
,
NewLeptatl/a、.'fromBorneo 389
carii: 3 exs., Bukittinggi, W Sumatra, 19-VI-1994, K. FUJITA leg; 5 Mt.
exs.,
Sibayak,N.Sumatra,24-III-1997,Y.JoHKIleg;3exs.,Brastagi,N.Sumatra,1998,
K.FuJITAleg. L humerosus: 1?,Bukittinggi,W.Sumatra, II-1988;1 Liwa, Lam-
,
pung,Sumatra,IX-2002.Lmasayukii:1 GunungTambora,Sumbawa(holotype,in
,
thecollectionoftheNationalScienceMuseum(Nat.Hist),Tokyo).L.schi11hammeri:
Ie,Sibolangit,SumatraUtara,25-II-1990,H.ScHILLHAMMERleg. (holotype, inthe
collectionoftheNaturhistorischesMuseum,Wien).
KeytotheLeptaula;x:SpeciesSharingMatElytralSide
Hypostoma1processwithalongitudinalgroove;13mm;Sumatra,Borneo
L ammerf IwAsE
sc
- Hypostoma1processwithoutlongitudinalgroove 2
2. Eyesmall,notprojectinglaterallybeyondcanthus;pronotumimpunctateexceptin
marginalgrooveandscar;LesserSundaspecies 3
- Eyelarge,projectinglaterallybeyondcanthus;pronotumpuncturedinlateralp0r
tion;GreaterSundaspecies 4
3. Bodysmaller, lessthan27mm inlength;elytranot fused; 25-26mm;Sumbawa
Flores L annaZANG
Bodylarger,30mmormoreinlength;elytrafused;30-32mm Sumbawa,Flores..
L masayukii IwAsE
4. Bodysmaller,18mmorlessinlength;externalsurfaceofmiddletibiamat;anterior
intermediateareaofmetasternumhairless;penisofmalegenitaliawithspineat
distalend;16-18mm;Sumatra,MalayPeninsula,Borneo
L hume1'osusKUwERT
- Bodylarger,19mmormoreinlength;externalsurfaceofmiddletibiapolishedex-
ceptinpunctures;anteriorintermediateareaofmetasternumhairy;penisofmale
genitaliawithoutspineatdistalend
5. Bodyrelativelyconvex,ratioofprothoraxthicknesstopronotumwidthmorethan
0.52;bodylength22mmorless;sideofpronotumweaklypunctured;19-22mm;
Sumatra L beccarii KUwERT
- Body fiat, ratioofprothorax thickness to pronotumwidth1essthan0.49; body
length24mmormore;sidesofpronotumdenselypunctured;24-26mm: Borneo
pf zda ｽa s no
.
Acknowledgments
WethankA. UEDA,T.KIKUTAandM.KERLEY forprovdinguswithinvaluable
specimensandS.NoMURAandH.ScHONMANNforgivingusopportunitiestoexamine
thetypespecimens.WealsoexpressourheartythankstoDr.T.HIDAKA forgivingus
opportunitiestoperformresearchesinBorneo.Thisstudywassupportedinpartbya
Grant-in-AidfromtheJapanSocietyforthePromotionofScience(No.14405013).
390 YutakaJo1-lK1.KunioARAY^andMasahiroKoN
要 約
常喜 豊・荒谷邦雄・近 雅専t :ボルネオからのヒラタクロツヤムシ属のl新種. - ボル
ネオのサバ州およびサラワク州から, クロツヤムシ科ヒラタクロツヤムシ属の1新種をLep-
tau/axh,dakaispnov.と名付けて記1成した.本極は革肖翅側面がっや消し状になる特徴を持ち,ス
マトラ産のL becca,11に近縁である. しかし, 体が大きく, 24mm以上あることと, 体がより
扁平なこと(前用角Jの厚み/前胸背板幅が0.49未満) によ11)L becca・,11から区別できる. ヒラタク
ロツヤムシ属のつや消し状の革ll 側n面をもつ種についての検索表を付した
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