Yoshiakioclytus, a new anaglyptine genus (Coleoptera, Cerambycidae) from Taiwan

2007·4.5 MB·

by  Niisato, Tatsuya

Elyt,・a,Tokyo 35(2):577-584,November3,2007
Yo,shiakioclytus,aNewAnaglyptineGenus(Coleoptera,
Cerambycidae) fromTaiwan
TatsuyaNIIsATo
BioindicaterCo.,Ltd.,Yarai-cho126,Shinjuku-ku,Tokyo,162-0805Japan
Abstract Anewanaglyptinegenus,Yoshlakiolytusnov.,isproposedforthe
TaiwanesespeciesEpiclytltstaiwanusCHANGoriginallydescribedunderthegenusof
thetribeClytini. Thenewgenusalsoseemstobeisolatedamongtheknownmembers
ofthe tribeAnaglyptinibecauseofthepeculiarityof thetypespecies. Itmayhave
somerelationshipwithHit・ticlytus0l-lBAYAsHIendemictoSouthwestJapan.
Firstly I wish to expressmy since1-e condolence to thememory of Yoshiaki
KoMIYA. Hesuddenlypassedawaybyheart failureon1August2006inthecourseof
researchingleaf-beetlesat Inamura-iwa, 0kutamaofwesternTokyo. I firstlymetDi'.
KoMIYAinPullCityofcentral TaiwanaboutthirtyyearsagowhenIwasauniversity
student. Weusuallywent tothemountainsofcentralTaiwan forco11etingbeetlesin
theseyears.Healwaystookmealongwithfriendshipandkindnessinspiteofgeneration
gapbeyondtwentyyears,andgavememuchscientificknowledgeincludingcoleoptero1-
o9y・
Inthismemorialpaper,IamgoingtoproposeanewanaglyptinegenusforEpiclytus
talwanusCHANGoccurringinTaiwan. ThepeculiarityofE taiwanuswasprovisionally
suggestedaspersonalcommunicationbyJunITOaboutaquartercenturyago;however,
I haveneverundertakenfurtherstudiesforituntilthepresenttime. Thetypespeciesof
thenewgenuswaserroneouslydescribedunderaclytinegenusbymisidentificationof
theorjgina1author. This interestingspeciesshouldbeplacednot only in thetribe
Anaglyptinibutalsoinanewgenusasshowninthefollowinglines. Thenewnameis
dedicatedtothelateDr.YoshiakiKoMIYAwhogreatlylovedtheinsectsandnatureof
Taiwanduringhislife time.
GenusYos11iakioclytusnov
Typespecies:Epi lytustaivllanusCHANG,1960.
Anaglyptini. Smallanaglyptineofshortandthickbodyincontrastwithverylong
andslenderappendages,andclearlyisolatedamongthetribethoughslightlysimilar in
faciestoHirticlytus. Bodyblackingeneral,clothedwithdenserecumbentpubescence,
partlydecoratedwithmaculationmadebyblackandwhitepubescence.
578 TatsuyaNIlsATo
Headshort and less voluminous,slightlynarrowedunder eyes in frontal view,
almoststraightlydeclivousinprofile;fronsquadrate,nearlyaslongaswide,quiteeven
andonlyweaklyconvex,without anyfurroworcarinaeven thoughatsides;clypeus
trapezoidal, membranous except near base, smooth on surface; labrum arcuately
roundedatapicalmargin;mandibleshortandbroad, ratherstronglyhookednearapex,
withabluntdentatapical2/3;maxillawithratherweaklydevelopedgaleaandlacinia,
terminalsegmentofpalpusweaklydilatedapicadevenin ; terminalsegment of labial
palpushardlydilatedapicad;eyesobliquedrop-shaped,small thoughstronglypromi-
nent, very widely separated fromoneanother; genae large, fairlydeeper than lower
eye-lobes; vertexconcaveatmidline,withantennalcavitiesmoderatelyraised, rather
widelyseparatedfromoneanother;occiputveryshort. Antennaedistinctlylonger than
bodyinbothsexes,withsegments3and4thickenedateachapex,succeedingsegments
moreorlessdepressedandslightlythickerthanbasalsegments,scapenearlyquadrate,
slightlydepressed,segment3distinctlylonger thansegment4andnearlyequalinlength
tosegment5,clothedwithminutevelvetypubescenceinapicalsevensegments,witha
sparserowoferecthairsalongundersideofbasalsegments.
Pronotumglobose,widestatanteriortomiddle,constrictedatbasewhichisslightly
narrower thanapex,hardlyborderedatbothapexandbase,markedlyconvex,provided
withapairofpubescentcallositiesatsidesofposteriortomiddle. Scutellummoderate,
rounded triangular.
Elytrafairlyshort,nearlytwiceaswideasthehumeri,subquadratethoughwidely
arcuatelyemarginateatsides,withdistincthumeri,apiceswidelyandnearlytransversely
truncate, without any apical teeth; disc moderately convex, provided with a pair of
prominentcallositiesnear base. HindwingwithveinPcreduced,onlysclerotizedin
apicalhalfandwithoutcrossveinconnectedwithanal vein, IA3十2Awelldeveloped
and forminganordinaryH-shape.
Prosternumstronglyraisedtowardsapicalmarginofcoxal cavities,withnarrow
presternalprocessalmostreachingthelevelofposteriormarginofpleuralprocesswhich
isbarelyreachingthelevelofexternalhalfofcoxal cavity. Meso-andmetathoraces
fairly reduced, moderatelyconvex;mesosterna1processrelativelybroad,moderately
narrowedapicad;mesocoxa1cavitynarrowlyopentometepimeron;metepimeronattain-
ingat a level of anterior part of hind coxa. Abdomenbroad andvery short, with
stronglytransverseventrites, last ventriteveryshort, weakly( ) ormoderately (早)
arcuateatapicalmargin.
Legslongandslender,withhindfemurdistinctlyexceedingelytra1apices,1sttarsal
segment elongate.
Malegenital organ relativelysmall and broad. Median lobebroad, with dorsal
platebroadlysubtruncateatapex,hardlyexposingventralplateindorsalview;median
struts sinuate; endopha11us without anysclerotized structure except for a pair of
crescent-likescleritesnear base. Tegmenwithbroadparamereswhichareshallowly
dehiscent,providedwithlongsetaeatapexofeachlobe. Eighthabdominalsegment
transversesemicircular.
NewAnaglyptineGenusfromTaiwan 579
Range. Taiwan.
Notes. Yoshiakioclytusnov establishedhereinisproposed forEpiclytustaiwanus
CHANGoriginallydescribed fromcentral Taiwan. Thetypespecieswasregardedas
belongingtoaclytinegenusbymisidentificationoftheoriginalauthorforthereasonof
itsexternalsimilaritytoEpiclytusspecies. ItnodoubtbelongstothetribeAnaglyptini
mainlybythebasaltuberclesonelytraandtheshortmetepimeronwhichbarelyreaches
theanteriorpart of hindcoxae.
Ontheotherhand,thetrueaffinityofthenewgenusisalmostuncertain. Ofallthe
sevenknowngeneraofthetribeAnaglyptini,thisnewgenusmayhavesomerelationship
withHirttclytusfromSouthwestJapan. Thetwogeneraatleastshareshort,broadand
convexbody,similarconformationofbasaltuberclesontheelytraandthemalegenital
Besides, thetypespeciesof thetwogeneraareknownastheborer of living
organ.
trunks. However,noimportantcharacterstatescanbefoundbetweenthetwogenera
showingthedirect relationship.
The rangeof Yoshiakio lytusnov hasso far beenknownonlyin Taiwan asthe
distributionofthetypespecies. Itisexpectedthatnewlocalitiesofthegenusorother
closerelativeswillbefoundin futureon thecontinental side of China.
Yoshiakioclytustaiwanus (CHANG, 1960),comb nov
(Figs.1-13)
EpjclytustaiwanltsCHANG,1960,Bull.Soc.PlantPatho1.Ent.,Taic1、ung,11(3/4),p.1,pl.1,fl9.1;type
locality:Mt.Chang-sheng.
Bodylength(measuredfromapicalmarginofclypeustoelytra1apices)4.9-5.5mm
in 5.3-5.8mm in早.
,
Colourblack,slightlybrownishintarsiandmouthparts. Bodyuniformlyclothed
withdenserecumbentpalegraypubescence,partlywithafewbrownhairs;antennawith
averysparserowofsemi-longblackhairsalongundersideofsegments2-6,supplemen-
tarywithasimilarhairateachapexofsegments7-10;pronotumwithblackpubescent
spotsonapairofweaktuberclesatsidesofbasal third,supplementarilywithblackish
brownerect hairs at sidesofapicalhalf;scutellumthinlypubescent;elytronalmost
entirelypalegraypubescent,thoughthepubescenceissparsenearmiddleandapicalfifth
duetoseemingblackbands,withablackpubescentspotontheprominentcallositynear
suturebehindscutellum, anobliqueblackpubescentbandnearmiddle,andanlinear
jncompletewhiteonealonganteriormarginof theblackband;ventralsurfacedensely
clothedwithpalegraypubescence, thoughthepubescenceislonger thanondorsum,
partlywithwhitepubescentmaculationatposteriormarginofmidcoxae,apicalsidesof
mesosternum, justbeforeapexofmetepisternumandalongexternalhalvesofapical
marginofmesosternum.
Headacrossprominenteyesmorethant3timesaswideaspronota1apex,closely
andsomewhat rugoselypunctured throughout; fronsnearly as longas wide,weakly
580 TatsuyaNIIsAT0
1
Figs.1-2. Yoshiakiolytusfatwa川Is (CHANG),comb nov. - 1, Male from Lienhwachih, central
Taiwan;2, femalefromWulai,northernTaiwan.
convextowardscentre,slightlydepressednear apex,parallel-sided;genae12timesas
deepaslowereye-lobes; vertexflattened,withprominentantennalcavitiesseparated
from eachother by a littlemore thanahalf widthof occiput; eyessmall though
markedlyprominent,separatedfromeachotherby4.4timesofthediameter. Antennae
surpassingelytra1apicesatsegment8( )orsegment10(早),withscapeslightlydilated
toapex, closelypunctured,segments3and5equal in length, the longest, terminal
segmentstronglyarcuateinapicalhalf.
Pronotumnearly0.9timesaslongasthemaximumwidth,slightlycontractedto
basethantoapex,withsidesarcuatelydilatedtoapicalthird( )orjustbeforemiddle
(早), thenarcuatelynarrowed tosubpara11e1part inbasaleighth; discwellconvex,
highest at apical4/9,stronglydeclivousinbasal third,providedwithapairofsmall
pubescentcallositiesatsidesofbasalthird. Scutellumroundedtriangular.
Elytraalittlelessthantwice(f) or nearly18times(早)aslongasthehumeral
Figs 3-13. Yoshiakioclytus talwanus (CHANG), comb nov. - 3, Body in dorso-1atera1view;4,
dittoinventro-1atera1view;5,hindwing;6,maxillainventralview;7,mandibleindorsalview;8,
labium inventral view;9,median lobeinlateral view;10, dittoindorsal view;11, tegmenin
dorsalview;12,8thtergiteindorsalview;13,8thsterniteinventralview.
NewAnaglyptineGenusfromTaiwan 581
582 TatsuvaNIIsATo
width;sideswithsomewhatprojectedhumeri,subpara11e1inbasal fourth,moderately
( ) orslightly (早) arcuatelyemarginatetoapical fourththen roundlynarrowedto
subtransversely truncateapices; discuniformlyconvexthoughstrongly raised towards
apical fourth,withapairofmarkedlyprominentcallositiesapproximatebetweensuture
nearbasal fifth,finelycloselypunctured,though thepuncturesarecoarserinbasal2/3.
Ventral surface closely punctured, provided with dense transverse furrowsnear
apical thirdofprosternum;analventritenearlyahalfoftheprecedingventriteand l/20
thelengthof abdomen.
Legsverylongandslender,especiallyin ,with femurexceedingelytra1apicesat
apical2/5(o'')cr t/3(早),tibiaslightlyarcuateinapicalthird,1sttarsalsegment twice
aslongasthe followingtwosegmentscombined.
Malegenitalorganratherlightlysclerotized. Medianlobe3/10thelengthofelytra;
dorsal plateverybroad, subpara11e1-sided, withbroadly truncateapex; ventral plate
weaklydivergentapicadbeforeapicalmarginwhichissubtruncatewithweakemargina-
tionatmiddle;medianstrutsdistinctlysinuate, nearly3/5 thelengthofmedianlobe.
Tegmen2/3thelengthofmedian lobe,withparameresslightlydilatedapicad,triangu-
larlydehiscent in3/10ofthewholelength inmid-line,each lobeobliquelytruncateat
apexwhichisprovidedwithafewlongsetae. Eighthtergitestronglytransverse,gently
emarginateatmiddleof apicalmargin. Eighthsterniteanchor-shaped,widelytriangu-
larlyconcaveat middleofapicalmargin.
Specimense:lcamined. 1 Lienhwachi, Yuchih, Nantou Hsien, C. Taiwan, 17-
,
III-1978,J. IT01eg;1早,Jiuyuetan,Yuchih,16-XII-1993, T. KIsHIMoT01eg;1
,
Shinshien, 500-800m inalt.,Wulai Township, Taipei Hsien, N. Taiwan, 25-II-2002,
W.-I CHOUleg; 1早,samelocality, 600m inalt., 28-II-2002,W.-I CHOUleg;1早,
Fushian, 600minalt.,Wulai Township,TaipeiHsien,T. KURIHARAleg.
Host plarit. Diospyros oldhami MAXIM. var. chartacea HAY. (Ebenaceae)
(CHANG,1960).
Distribution. Taiwan.
Notes. Yoshiakioclytustaiwanusappears inearlyspring, and itspeakperiod is
several weeksbetweenmid Februaryandearly March on themountainsnear Taipei
Hsien. I examined one femalespecimen collected from Jiuyuetan of the central
mountains of Taiwan in mid December. Thisspeciesmaysometimesappear insuch
winterseason. TheadultbeetlesusuallycomebyflyingtotheblossomsofLitseacubeba
(LOUR) PERSor Castanopstscarlesii (THUNBex MURRAY) SCHOTTKYvar.carlesii
(HEMsL) onclearday (CHOU,2004, CHOU,pers.comm).
ThelarvalstageofY taiwanusisalmostunknown. AccordingtoCHANG(1960b),
theuniqueholotypemalewasdugout fromthelivingtrunkofDiospyrosoldhami var.
chartacea. It is a very interesting fact for feeding habit. Hirtyclytus comosus
(MATSUSHITA) isknownas theborerof livingPodocarpusnagi ZOLL et MoRITzI.,
thoughitshostplant isaconifer. Thesimilarhabit isknowninthecasesof01igoenoprus
CHEvRoLAT from East Asiaand Micro lytus LECoNTE fromNorth America. The
larvaeof the two generamine in the barksof livingdecayedbroadleaved treesand
NewAnaglyptineGenusfromTaiwan 583
pupatein thesameplaces.
Acknowledgements
I wish to heartily thank Dr.Shun-IchiUtNo for hiscontinuous guidanceand
criticalreviewoftheoriginaldraftofthispaper. HeartythanksarealsoduetoMr.Jun
ITO, who firstly suggested me thesystematic position of Epiclytus taiwanus in the
Anaglyptini more than a quarter century ago, to Drs. W.-I CHOU and Toshio
KIsHIMoTo,MessrsTakashiKURIHARAandY.-L.LINfortheirkindofferof invaluable
materialusedinthisstudy,andalsotoMr.TakashiMIzUsAwAfor takingphotographs
inserted in thispaper.
要 約
新里達也: 台湾におけるトガリバアカネトラカミキリ族の1新属. - 台湾産Epiclytus tai-
wanusCHANGを基準種として, トガリバアカネトラカミキリ族の新属Yoshiakioclytusnov.を創
設した. 本新属の基準種は, トラカミキリ方実1のョコヤマトラカミキリ属のもとに記載されたが,
上翅基部の毛東を備えた隆起や後方に伸張しない後月 ・繿板､などの形質からトガリバアカネトラ
カミキリ族に所属すべきであることは間違いない. この新属の直接の類縁関係は明らかではない
が, あえて既知属にそれを求めるとすれば, 西日本に分布するケブカトラカミキリ属といくつか
の類似点が見出しえるが, 異なる点も少なくない. おそらく, 台湾対岸の大陸側から, 本属かそ
れに近縁な属が将来発見されるにちがいない.
新属名には,昨年夏に急通された小宮義章f 博士を個、び, Yoshiakioctytusと命名した.私は学生時
代の数年間にわたり, 小宮博士とご一緒に台湾中部の山を採集に歩いた. 往時より, 台湾の昆虫
と風土をこよなく愛されておられたことを思い出す.
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