A New Anophthalmic Trechiama (Coleoptera, Trechinae) from Central Hokkaido, Northeast Japan

7 Pages·1992·7.1 MB·English

by  Ueno, S-I

Elytra, Tokyo,20(2):137-143,Nov.15,1992
A NewAnophthalmic Trechiama(Coleoptera,Trechinae)
fromCentral Hokkaido,NortheastJapan1,2)
Shun-lobi UEN0
DepartmentofZoology,NationalScienceMuseum(Nat. Hist)
3-23-1Hyakunin-cho,Shinjuku,Tokyo,169Japan
and
G.Sh. LAFER
InstituteofBiologyandPedology,FarEastBranchofthe
RussianAcademyofSciences,Vladivostok22,690022Russia
Abstract AnewanophthalmicspeciesofthetrechinegenusT1,ec・hiamaisdescribed
fromthesouthernpartoftheSorachiHillsincentralHokkaido,NortheastJapan,under
thenameof T kuznetso、,t. Itbelongsto thegroupof T be・tcalls,andismainlychar-
acterizedbythepeculiarlyshapedpronotumwithatleastapairofdisca1setaeandthe
uniqueconformationofmalegenitalia.
SincethetrechinefaunaoftheHidakaandtheYubariMountainRangesincentral
Hokkaidowasdealtwithbytheseniorauthorinl971,nothinghasbeenaddedtoour
knowledgeabouttheTrechlamaspeciesoccurringinthisnorthernislandofJapan. It
istruethat astrangeTrechlama-liketrechinebeetle, A(・,coo//aaく/fratS. UENo(1990, p.
170, fig. 1), wasdiscoveredat thesoutherntipofsouthwesternHokkaido, but it has
no direct relationship with the group of Trechlama bo1・calls, to which all the five,
previously known species belong. This species-group is considered to have been
derived fromanancestralspeciesof thegroupofT.oreas,whichsomehowreached
southerncentral Hokkaidoacrosstheseabysweepstakesdispersal (cf. UENo, l971,
pp 7,26).
Recently, through the Russo-Japaneseco-operative investigations of the East
Asian insect fauna, a new species of anophthalmic Tre(,hiama of the group of
T bo,callswas unexpectedly discoveredat thesouthernpart of theSorachi Hills,
whichrunat thewesternsideoftheYubariRangeparallel toit andcanberegarded
asabranchridgeofthelatter. Moststrikingisthat thisnewtrechineoccursat the
foot ofahillonly519minheight,whereasalltheothermembersofthesamespecies-
group inhabit thealpineor thesubalpinezoneabove1,000minaltitude. It will be
describedinthepresentpaperunderthenameofTie(・/11anlaktl?,1etsov1.
1) Thisstudy issupportedinpartbytheGrant-in-aidforScientificResearchNo.03640633from
theMinistryofEducation,ScienceandCulture,Japan.
2) Report No. l7 from the Japan/Russia Cooperative East Asian Entomological Program.
138 Shun-Ichi UEN0and G.Sh. LAFER
Theabbreviationsused hereinare thesameas thoseexplained in theseniorau-
thor's l971paper(p 6).
TheauthorswishtoexpresstheirdeepindebtednesstoDr.V. N. KuzNETsov,
Dr. A. B. EGOROv, Messrs. Susumu KANENoandMasahiro OHARAeither for their
kindhelpinthefieldor forobtainingadditional informationabout thehabitatofthe
newspecies.
Trechiama(s.str) kuznetsoviS.UENoet LAFER,sp
n ov.
(Figs.1-3)
Length:4.95-5.80mm(fromapicalmarginofclypeustoapicesofelytra).
Belongingto thegroupof I'. bet・callsandrelated to T. lnflexusS. UENo(1971,
pp 8,18,figs.12-14) from Mt. Ashibetsu-dakeandMt. Yubari-dake, bothof which
lieontheYubari MountainRange,butdistinguishedat firstsight fromthatspecies
byitslargersize,darkercoloration,largerprothoraxwithmuchamplerandsquarer
basal part,muchlesssinuatesides, lessacutehindanglesandat leastapairof disca1
setae,moreovateelytrawithbroader basal parts, moresalient shouldersandmuch
deeperanddistinctlypunctatestriae,the5thofwhichjoinsapicalstricto,anddifferent_
1yshapedaedeaguswithdifferentiatedcoupulatorypieces.
Bodyrobust,withsmall head, fairlylargesubcampanulateprothoraxand large
ovatehindbody. Colourreddishbrown,darkerthaninT.lnfle1.als,shiny,andfaintly
iridescentonelytra;palpi,apicalhalvesofantennae,andlegsmoreorlesslighterthan
dorsum.
Headsmall, about aswideasor slightlywider than long, widest alittlebehind
middle, andmoderatelydepressedabove, withwideneck andshallowneckconstric-
tion;frontalfurrowsdeepthroughout,ratherfeeblycurvedandnotangulateatmiddle;
fronsandsupraorbitalareasmoderatelyconvex;microsculpturedistinct,mostlycon-
sistingoftransversemeshesandlines;traceofeyesdistinctthoughsmall;genaefeebly
and evenly convex, completely devoid of hairs; neck constrictionshallow and not
sharply marked; labrum transverse, widely emarginate at apex; mandibles fairly
slender,brieflybutsharplyarcuateatapices;mentumtoothporrectandbifid;palpj
slender,withpenultimatesegmentsgraduallydilated towardsapicesandapicalseg_
mentsgradually tapered towards blunt tips; antennae filiform though rather short,
reachingorextendingslightlybeyondbasal thirdofelytra,segment 2theshortest,
slightlyshorter thaneachofsegments8-10and three-fourthsaslongassegment3,
whichisabout aslongas4or 5,segments6and7subequa1inlengthandslightly
shorter thantheprecedingsegments,segment8aboutthree-eighthsaswideaslong,
terminalsegmentthelongest,obviouslylongerbutnarrowerthanscape.
Pronotum subcampanulate,muchwider thanhead, distinctlywider than long,
widest at about two-thirds from base or a little behind that level, andmuchmore
St「onglyContractedatapexthanatbase;PW/HW138_1.4g(M I43), pw/pL1.18_
1.28(M I 22), PW/PA t47-1.56(M I53),PW/PB1.09-1.17(M1.13);sidesgently
NewAnophthalmicTfi,ec・hiatnafromCentral Hokkaido 139
Fi9. l. T「eChiama(S.St「.)kuznetsoyiS.UENoetLAFER,spnov., fromNoborjkawajncentral
,
Hokkaido.
andevenlyarcuateinfront,slightlysinuateataboutbasalthird,andthenejthersub_
parallelorslightlyconvergenttowardshindangles,whicharerectangularthoughoften
obtuselydenticulatelateradat thecorners;lateralbordersnarrowinfront,becomjng
widerbehindmiddle,andwidelyreflexedinbasalpart;bothlateralandpostangular
140 Shun-Ichi UENoandG.Sh. LAFER
setaepresent, thelatterslightlyremoved forwards: apexeither straight or slightly
emarginate, with front angles obtuselyproduced forwards; base much wider than
apex,PB/pA t 2g_1.42 (M I 35), either almost straight or very slightly bisinuate;
surfaceconvexandsmooth, usuallywithapairofdisca1setaeatabout three-fifths
frombase,sometjmesalsowithanadditionalsetaononeside; basalpartverywide,
ample;mjcrosculpture formed by netransverselines, thoughpartiallydegenerated;
medianlinedeeplyimpressed,somewhatwidenedinbasalareaandalmostreaChin9
base;apjca1transversejmpressionobsolete,basalonedeepthoughmostlycontained
jnlargebasal foveaeandinterruptedatmiddle;basal foveaelargeanddeep,Some-
what uneven at the bottom, and divergent anteriorly; postangular carinaedistinct
thoughsometimesobtuse;basalmarginalareamoreorlessuneven.
Elytraovate,muchwiderthanprothoraxandobviouslylongerthanwide,usually
wjdest at about three-sevenths from bases, and more gradually narrowed tOWa「dS
apicesthantowardsbases,withbroadamplebasalparts;EW/PW158-1.72(MI66),
EL/Ew 147_1.57 (M 1.52); shoulders distinct though rounded; humeral borders
reachjngthebaseofjnterva16butnotthebaseofstria5asthelatterabruptlyCu「VeS
jnwardsatthebasalportion;sideswidelyreflexedbeforemiddle,gentlyarcuatef「om
behjndshoulderstotheleveloftheapicalmostporeofthemarginalumbilicateSe「ieS,
andthenconjointlyroundedatapices,eachusuallywithveryslightpreaPiCa1ema「91-
nation;surfaceconvexthoughratherwidelydepressedonthedisc,withSteepapical
declivity;microsculpturemostlyobliterated,thoughconsistingoffinetranSVe「SelineS;
strjaeentjre,deeplyimpressedandclearlypunctatethroughout,striae4-5inWa「dly
curvedat thebasalparts,8deepenedbehind themiddleset ofmarginal umbilicate
pores;scutellarstrjoledeep; apical striolealso deep, ratherstrongly a「Cuate, and
joiningstria51intervalsslightlyconvexonthedisciapicalcarinaProminent,St「Ia3
wjththreesetjferousdorsalporesat1/9-1/8,about1/3andabout2/3f「ombase「eSPeC-
tively;preapica1poresituatedattheapicalanastomosisofstriae2and3,andmuch
moredjstant fromapexthanfromsuture;stria5withtwosetiferousdo「SalPO「eSat
l/2frombaserespectively;humeralsetofmarginalumbilicatePO「eS
1/7_1/5and3/7_
regular,thefourporesbeingrangedequidistantly.
ventralsurfacesmooth;analsetaeasusual for amemberof theborealis9「cuP・
Legsratherstout.protibiaestraight,moderatelydilatedtowardsapices,eachWitha
deeplongjtudjna1grooveontheexternal face;tarsinotparticula「lySlende「; in
,
twoproxjmalsegmentsofeachprotarsuswidelydilated,stoutlyproducedinWa「dSat
apices,andfurnishedbeneathwithadhesiveappendages.
Malegenitalorganfairlylargeandheavilysclerotized. Aedeaguseton9ate,th「ee-
ejghthsaslongaselytra,gentlyarcuatefrombasetoapex,lightlydeP「eSSed,tubula「
jnbasalhalf,andgraduallynarrowedfrombehindmiddleinprofile,withapicallobe
attenedandmoderatelycurvedventrad;basalpartelongate,notab「uptlybent,With
smallbasalorifice,whosesidesaredeeplyemarginate;sagittalaileronPresentthou9h
narrow;apjca11obeelongatedsubtriangularindorsalview,verynarrowanddo「Sally
tuberculateat thetipinlateral view;ventralmarginshallowly,widelyandunevenly
NewAnophthalmicTrechianlafromCentral Hokkaido 141
3
、、、 /
0.5mm
Fi9S. 2-3. Malegenitaliaof Trechia'na(s.str)kuznetsoviS.UENoetLAFER,sp nov., from
NoborikawaincentralHokkaido;leftlateralview(2),andapicalpartofaedeagus,dorso_
apicalview
emar9inateinprofile. Inner sacarmedwith threeanisotopic copulatorypieces, one
「i9ht latera1and two left lateral,andtwogroups ofsclerotized teeth; right lateral
Copulatory piece vertical, lamellar and rolled; left lateralonesnarrowand twjsted,
horizontallylyingoneabove theotherat themiddleof aedeagusandpartiallyen-
velopedwithminutescalescoveringfoldedsacmembrane;proximal teeth-patchleft
late「al,lyingjust belowdorsalsclerite,consistingoflargeteeth,andmostlycovered
Withminutescalesofsacmembrane;dorso-apical teeth-patchmuchlargerthan the
left lateral, horizontallyextendingbackwardsfromapical orifice. Styles largeand
elongate, leftstylebeingmuchlargerthantheright,eachusuallybearing four long
setaeattheapex,thoughtherightstylesometimeslacksoneofthem.
Type So「leS. Holotype: , allotype: 2-VII-1992, V. N. KUzNETsov leg.
,
Pa「atypeS: 5 4 2-VII-1992, V. N. KuzNETsov leg; l , 2_VI1_1gg2, S.
, ,
KANENoleg ;4 1 20-VII-1992,M.0HARAleg.
, ,
Theholotypeandallotypearedepositedinthecollectionof theDepartmentof
Zoology, National ScienceMuseum(Nat.Hist), Tokyo. Theparatypesaredistrib_
utedtotheabovecollectionandthatof theInstituteofBiology andPedology,Far
East BranchoftheRussianAcademyofSciences, Vladivostok.
Type locality. Noborikawa, 240m inaltitude, of Momijiyamain Yubari-shi,
central Hokkaido,NortheastJapan.
Notes. Because of the broad body form, broad basal part of pronotumand
elongateaedeagus,thisnewspeciesismostcloselyrelatedtoT. info:xusS.UENoofthe
142 Shun-lobi UEN0and G.Sh. LAFER
Yubari Mountains. Thisisalsosuggestedbythegeographicalsituationof thetype
locality,whichisonly23kmdistanttothesouth-southwestbywest fromMt.Yubari-
dakeandliesnear thespotwherethesouthernextensionoftheYubarisapproaches
to that of theSorachis. Thenewspeciesis, however,considerablydifferent fromthe
latter notonlyinexternalmorphologybutalsoinaedeagalstructure. Thepresence
ofdiscal setaeonpronotumisofparticular interest,sincethesesetaeare knownto
existonlyinT.watanabeiS.UENo(1971,pp 7,15,fig.1I),whichoccursatthemiddle
altitudeofMt.Tottabetsu-dakeoftheHidakas,andareabsentinallthehighaltitude
members of the species-group. Besides, the differentiated inner armature of male
genitaliaisuniquetoT kuznetsov1. Thoughtheaedeaga1tubeitselfresemblesthatof
T. lnflexus, thisspeciespossessesahyalinevertical lamellaasisfoundinT borealis
S.UENo(1961,p 331, figs. l-2; 1971,pp 7,8, figs.1-6) inaddition to twonarrow
sclerites.
The habitat of T ktlznetsov1wasfoundalonganarrowstream near Kaede coal
mine. ThisstreamisoneoftheheadspringsoftheHoroka-kuruki-gawa,atributary
of theYubari-gawaRiver that flowsnorthwest into theSeaof Japan. There is a
small damacrossthenarrowstreamat anelevationof240m, formingathindeposit
ofsoilandgravelatitsbase. Itisthisspotthatharboursthetrechinebeetle,whichis
neitherupperhypogeannorevenendogeanatleastearlyinthesummer. All thetype
specimenswerefoundeither frombeneathstonesor fromthe thindeposit of soil,
andwerefairlyactivewhenexposed.
ThediscoveryofT kt.lznetsov1atalowaltitudeoftheSorachi Hillssuggeststhat
other newspeciesof thesamelineagecouldbe foundon thelowhillsat theeastern
sjdeof theIshikariLowland. It istobehopedthatcarefulinvestigations,particularly
oftheupperhypogeanzone,willbemadeinthatpartofHokkaidoinnear futureand
bringthosetrechinebeetlestolight.
要 約
上野俊一・G. Sh. LAFER: 道央地方産ナカチビコミムシ属の1新盲目種. - ヒ海道空知山地の
南部, 夕張市紅葉山登川で発見されたナガチビゴミムシ属の盲1種を新種と認め, ズンドウメクラチ
ビゴミムシ Trechiama (s. str) kuznetso、ll S. UENoet LAFER と命名し記載した. この種はヒタ
カメクラチビコミムシ種?flに属し, タ張l」1地の高山,fから知られるューウ, リメクラチヒコミムシに類
縁が近いが, 大型で, 基部の異常に広い前月t9背板に1対以上の背剛毛があり, 雄交尾器の形状もいち
じるしく異なっている. 同じ種 の既知種がすべて高山性ないし 高山性であるのに対して, この新
種が標高わずか 240m のll.施l に生息することは, 今後も新しい盲目種の発見があるだろうと予測さ
せるものである.
References
UENo,S.-I., 1961. Alpinetrechids fromHokkaido, Japan. 111. Occurrence of T,,・echiamain Hok-
kaido. Mem.Coll.Set. Univ. Kyoto, (B),28:331-336,1pl.
NewAnophthalmicT・iec・hia,nafromCentral Hokkaido 143
UENo,S.-I.,1971. Thetrechinebeetles of theHidakaandtheYubari MountainRangesin Hok-
kaido,northernJapan. Me,n natt1.Sc・1.Mus., Tokyo,(4):5-28.
- 1990. TheanophthalmictrechinebeetlesfromthesouthwesterntipofHokkaido,Northeast
Japan. Elytra, Tokyo,18:167-173.
Elytra,Tokyo,20(2):143,Nov. I5,1992
ANewLocalityof Trechiamasichotanus(Coleoptera, Trechinae)
Shun-lobi UEN0 and G.Sh. LAFER
Trechiama (Leptepaphiama) sichotanus (LAFER) (origina11y Leptepaphiama sichotana
LAFER,1989, 0pred. Nasek.Dal'negoVostokaSSSR,3(1),p.143,fig89-1)isaremarkable
trechinebeetledescribedfrom four femalescollectedinthesubalpinezoneof Mt.Lysaya
on the Khrebet Partizanskij u Benevskogo inPrimorskij Kray. They were found from
understones lyingbesidetheheadspringofanarrowstreamaf t,400-1,500m inaltitude.
On a recent collecting trip, a femalespecimen of thisspecies wascollected on the
westernsideof thesamemountainrangetothesouthwestofthetypelocality. itwasdug
out from theupper hypogeanzoneabout50cmbelowthesurfaceatanelevation ofonly
480m. Thiscanbeconsideredtobeanexampleofthewellknown factthatanophthalmic
ormicrophthalmictrechinebeetlesoccur undergroundat lowelevationsbut arerather
frequentlymetwithonornear thesurfaceattheheightsofmountains.
Thecollectingdataof thespecimeninquestionareasfollows: l Mt. Konstantino-
,
pol,MalajaMuladzaValley,480malt.,PartizanskijKhrebet,PartizanskijCo.,Primorskij
Kray,13-VIII-1992,S.UENoleg. (NSMT).
Thjsspecimen,6.00mmin the lengthof body, issomewhat different from thetype
serjes jn theshapeofpronotum, which ismorewidelydilatedanteriadandhasthesides
morestronglyarcuatein front, but otherwiseagrees with thelatter in all tjheimportant
pojnts. Thestandardratiosofitsbodypartsareasfollows[those of the typeseries are
giveninbrackets]: PW/HW143L134-1.38],PW/PL1.l1[1.07-1.10],PW/PA t 49[1.45-
1.48],pW/PB164[1.52-1.53],PB/PA0.91[0.95-0.97」,EW/PW186[1.87-1.90],EL/EW
1.45 [1.44-1.47].