A New Species of the Rhagophthalmid Genus Menghuoius (Coleoptera, Rhagophthalmidae) from Myanmar

6 Pages·2002·5.4 MB·

by  Kawashima, I

E、l't''a,「otkyo,30(2):487-492,November22,2002
ANewSpeciesoftheRhagophthalmidGenusMenghuolus
(Coleoptera,Rhagophthalmidae)fromMyanmar
ItSu「0 WASHIMA
Nagasawa1-50-9,Yokosuka-shi,Kanagawa,239-0842Japan
AbSt「act AnewspeciesoftherhagophthalmidgenusMenghuo!fisisdescribed
andillustratedfromMyanmarunderthenameofM kusakabei.ItisrelatedtoM
lngens
(FAIRMAIRE)butdistinguishedbythesmallsizeanddifferentlyshapedmalegenitalia
Introduction
The9enusMenghuoiuswasestablishedbymyself(KAwAsHIMA,2000)asamem_
berofthefamilyRhagophthalmidae.Recently,severalspecimensofthisgenuswere
CollectedbyMr.YoshiyasuKUsAKABEinwesternMyanmarandsubmittedtomefor
taxonomicstudy.Sincethematerialprovedtobelongtoanewspecies,jtwj11bede_
scribedandillustratedinthepresentpaper.
MaterialsandMethods
Thematerialsusedinthepresentstudyareenumeratedundertheheading“r
e
series” followingthedescription.Fordissection,driedmaterialswererelaxed inhot
water,andthen,malegenitaliawereremovedfrombody,mountedonaslideglasswith
glycerol,observedunderanopticalmicroscope(0L;YMPUSCH-2,max magnjfjca_
tiOnX1,000),andsketchedwiththeaidofanattacheddrawingtube.Externalcharac_
terswereobservedandsketchedwithastereoscopicmicroscope(0L;YMpUsszH10,
max magnification X140)equippedwithadrawing tube. Theabbreviationsused
he「einarethesameasthoseexplainedinapreviouspaperofmine(KAwAsHIMA,
2000).
Description
Me'tghuoMskusakabeiKAwAsHIMA,sp nov.
(Figs. l-5)
Male. Bodymoderatelyshiny,coveredalmost all over includingappendages
withgoldensubrecumbent pubescence.Headcapsuleentirely blackish on dorsum,
brown on venter; antennae yellowish brown; eyes black; labrum yellowish brown;
mandiblesblackishbrown, paler towards thebases,whichare tingedwithreddish
488 1tsur0KAWAS1-lIMA
brown;maxillaeandlabiumyellowishbrownincludingpalpi; pronotumblackishto
blackjshbrown,becoming feeblypaler towardsthesides;scutellumdark yellowish
brown;elytradarkbrown,entirelytingedolive,narrowlymarginatedthroughoutinyel-
lowjncludingsuture;legsaml ostwhollyyellowish;clawsyellowish,darkertowa「dS
theapices,whicharetingedwithdarkbrown;ventralsurfaceofthoracesandabdomen
constantlyyellowishbrown.Malegenitaliashiny,pigmented;externalsurfacealmost
yellowishtoreddishbrown;innermarginsofbothparameresblackishonvente「;inne「
surfaceanddistalmarginalareasofparamerespalebrownish.
Body(Fig.1)elongatedoval,graduallydilatedtowardsthemiddleofelytra,Sides
notparallel.
Head(Fjg2)largeandtransverse,evidentlywiderthanlong,stronglydep「eSSed
aboveandIongjtudjna11yconcavealongmid-line,rathersmoothorminutelypunctate
ondorsalsurface;antennalsocketslocatedonbothsidesof frontalareajustbeOf「e
eyes,widelyseparatedfromeachother,orientedlaterad,andeasilyvisibleindo「Sal
vjew.Antennae(Fig3)12-segmentedbutveryshort,onlyreachinganteriorma「9inof
pronotum;scapethjckandclavate,abouttwiceaslongaswide;pedicelshortCylind「l-
oaferbarrel_shaped;3rdand4th(1stand2ndflagellar)segmentsclearlydilatedand
Fjg l. Menghtlojuskusakabe1KAwAsHIMA,spnov.,holotypemale,do「SalView
NewRhagophthalmidoftheGenusMenghiloius 489
E
E
-.
Figs. 2-3. Me1'ghuoiuskusakabe1KAwAsHIMA,sp nov.,male, dorsal view headandpronotum; 3,
rightantenna.
becomingwidertowardstheapices,5thto11th(3rdto9th agellar)segmentsserrated
continuously,eachwithasensillumattheevidentlyprotrudedanteriorportion;12th
(10th agelIar)segmentspindle-shapedandthemostslender;relativelengthofeach
Segment fromscapeintheholotypeasfollows:- 10:6:6:5:4.9:5:5:5:5:4.9:5:7.
Eyes(Fig 2)globular, largeandprominentlaterally,eachwithadeepposteriorexca_
vationondorsalside,separated fromeachotherbyabout15timesofthediameterof
aneyeondorsalsideanddistinctlyseparatedby0.46to0.5timesoftheradiusofeye
evenonventral side. Labrum(Fig 2)moderatelymembraneous,evidentlytransverse
andextremely attenedspindle-shaped,withoutanyemarginationatthecentreofante-
riormargin.Mandibles(Fig 2)largeandslender,whollyseenfromdorsalside,inter_
nattyformingaroundedanglenearthebases,andthenconstantlyincurvedandgradu-
allytaperedtowardsacuteapices.
Pronotum(Figs.1,2)relativelylargebutshort,transverselysemicircularortrape-
zoidalindorsalview,moreorlessvariableinshapeindividually,widestatorjustbe_
forethebase;anteriormarginwidelyarcuateandproducedanteria bothexteriormost
portionsofthemarginminutelyprotrudedand formingminuteangles;bothsides fee_
490 ItsuroKAWASHIMA
blyarcuateorsinuate,almostwithoutmargin,reexedand formingwidely flattened
areasalongalmostwholelength,andvery faintlyconstrictedjustbeforebasalangles;
dorsal surface feebly wrinkled; basalanglesvery faintlyprojectedoutwards; basal
margjnsjnuateonbothsides,narrowlyborderedthroughout;discweaklydepressed,
mjnutelyandconstantlypunctate,thepuncturesbeingrelativelysmallerminute;Ve「y
shallowmedic_longitudinal furrowrunningalongthemid-lineatthebasalhalf,butal-
most disappearingon thediscand theanterior parts;PW/HW126-1.33; PW/PL
1.66_1.70;pW/PA130-1.38;PW/PB1.01-1.02;PL/PW0.59-0.60;PW/EHW0.96-
097.
.
Scutellumtriangularwithroundedapex,closelypunctateondorsalsu「face.
Elytra(Fig.1) fairlybroa butmoreorlesscurledlongitudinallyindriedcondi-
tjon,sjdesdjvergentposteria mostwidelyseparatedatthemiddle,andthengradually
convergenttoroundedapices,distinctlydehiscentinapicalparts,narrowlymarginated
throughout jncludjngsuture,themarginbeingconcealedbyhumeri,whichareweakly
promjnentantero-1aterad;dorsalsurfacerugulose, irregularlyandcloselypunctate;
eachelytronwiththreevaguecostae,ofwhichthemiddleoneistheIon9estandClea「一
est,runningthroughoutthelengthofelytra;exteriormostonenotreachin9ante「Oi「
partanddisappearing; innermostoneshort,veryweakandmoreobsolete.EachCosta
obliquelyrunninginwardsneartheelytralapices;EL/PL4.39-466;EL/EHW2.53-
2.70;EHW/PW1.02-1.04.
All legs(Fjg.1)notsolongbutslender; femorafusiformandmoderatelyflat-
teneddorso_ventrally;tibiaealmoststraightthoughincurvedatthebases,eachWith
onesmall tjbja1spur;tarsirelativelylong,almostofthesamelengthoronlyalittle
longer thantibiae; tarsal formula5-5-5;tarsomeresexcept for theapicaloneeach
withmembraneouslingulatelamellaonventro-apica1portion,butthoseofbasaltwo
segmentsareveryweaklydevelopedoralmostdisappear.
Abdomenbroadand atteneddorso-ventrallyindriedcondition,withsevenvisi-
blesegmentsinventralview;sidesalmostparallel inbasal twosegments,andthen
graduallyconvergentposteriadfromthirdsegmenttoanalend.
MalegenjtaljaasshowninFigs.4-5,stronglysclerotize symmetricallyt「i1obe
weaklydepresseddorso-ventra11y,broadandcrown-shapedasawhole,me「eo「less
variable in general shapewith individuals; external surface smooth and 9lab「ouS
thoughthedjsta1andinnermarginalareasofparameresaregranulate.BasalPlate
large,roundedquadrateindorsalview,widelyopenonventer,distalmarginWidely
bisinuate,shallowlyconcaveincentralpart.Aedeagusstoutandwidea「「oW-ShaPed
wjthroundedapex,wjdeandrather atteneddorso-ventra11y,graduallybentVent「adin
aboutdistal third;sidesgraduallyconvergent towardstheapicalPortion, thou9hex-
pandedtriangularlyataboutdistal2/5,clearlyshorterthanthelengthofPa「ame「eS・
parameresspatulate,embracingaedeagusfromleftandright,joiningatthebaseson
ventralside;thejoiningareawithapairoffairlyclearandlongitudinal9「coves;eXte「一
na1sjdesmoreorlessarcuate,graduallydivergenttowardstheapices,widelySepa「ated
fromeachother ondorsal side,andthenthebasalhalvesofthemarginsondo「Sum
NewRhagophthalmidoftheGenusMengh11o加s 491
j
E
E
,Lc
'
0
Figs.4-5. Me'lg/tuoiuskusakabelKAwAsHIMA,spnov..malegenitalia;dorsalview(4);ventralview(5)
graduallydivergenttowardstheapices;distalhalvesofinnermarginsobliquelytrun-
catedoutwardsonventerbeforeapices, forminganangle,andthenthebasalhalvesof
themarginsalmostsubpara11e1orweaklyarcuate,veryshallowprojectionsseenatthe
distal third, internallyexpanded.
Measurement1,1mm. BL: 18.10 (in theholotype) (range17.10-18.30); HW:
3.90(3.75-3.90);PL:3.05(2.80-3.00);PA:3.90(3.60-3.70);PB:5.10(4.70-4.98);
pw:5.20(4.75_5.10);EL: l3.40(l2.90-13.70);EHW:5.30(4.90-5.30);HTL:3.30
(2.90-3.00).
Female. Unknown(probablywinglesslarviform).
Type series (all dried). Holotype: 1?, Mt. Victoria(NatmaTaungNational
park),ca2,000minalt.,nearKanpetlet,ChinState,W.Myanmar,6~8-VI-2001,Y・
KUsAKARF l◆eg Paratypcs: 3 (5',samedataas fo「theholotype;1 ,Samelocalityas
above,3-VI-2002,Y.KUsAKABEleg.
TheholotypeispreservedintheinsectcollectionofNagoyaWomen'sUniversity,
Nagoya(LaboratoryofNatureConservation,Dr.MasatakaSAT0).TheparatyPeSa「e
preservedintheauthor'scollection,Yokosuka-shi,Kanagawa.
Range. W.Myanmar.
Remarks. Thisnewspeciesisrelativelysimilartothetypespeciesofthegenus,
M. ingens (FAIRMAIRE, 1896), but thebody is fairly small and has Slende「e「ap-
pendages,andthepronota1width isnarrower thanthehumeralwidthof theelytra;
clearlydistinguishedfromthelatterbythedifferenceinshapeofthemalegenitalia.At
aglance,themalegenitalialookverysimilartothoseofM.1ngens,buttheaedeaguSiS
clearlyshorterthantheparameres.
492 Itsuro KAWASHlMA
All thespecimensofthetypeseriesflewtoalighttrapjustafterthesunset,be-
tween7:30and8:30pm.(Y.KUsAKABE,pers.comm).
Acknowledgement
IwishtoexpressmysincerethankstoDr.Shun-IchiUENooftheNationalSci-
enceMuseum(Nat.Hist),Tokyo,forhiscriticallyreadingtheoriginalmanuscriptand
helpfuladvice,andtoDr.MasatakaSAT0ofNagoyaWomens' University,Nagoya, fo「
hiskindsupport,andalsotoMr.YoshiyasuKUsAKABEofYokohama-shi,Kana9awa,
forhissupplyingthematerials.
要 約
川島逸; 郎:イリオモテボタル科Mengh1loI,,s属の1新種の記載. - イリオモテボタル (オ
オメボタル)科Menghuoius属は,同科の基準属であるRhagophtha1,ntls属から頭胸部の形質の
特化・発達を根拠に分離され, KAwAsHIMA(2000)によって創設された一群である. 今回その第
2番目とみなされる種がミャンマーから新たに発見されたので, 本論文においてM kusakabe1
と命名して記載した. この種は, 本属の基準種であるMingens(FAIRMAIRt,1896)と比較すると
かなり小型で, より繊細な外部形態をもち, 前胸の最大幅が上地肩部の幅より狭いこと, 雄交
尾器は全体的にはよく類似するものの, 中片においてその形状や側片との相対長が異なること
などで区別される.
Reference
KAwAsHIMA, 1., 2000. A redescriptionofRhagop/1t/1a/mus inge'IsFAIRMAIRE(Coleoptera,Rhagoph-
thaImidae)fromnorthernVietnum,withestablishmentofanewgenusinthefamily. Elyt,・a,To(k、,o,
28:131-140.