El、't1-a,Tok、・0.29(1):249-256,Junel5,200 ANewThreatenedSpeciesoftheGenusTrechiama(Coleoptera, Trechinae)fromNortheasternHonshu,Japan,with NotesonanEndangeredSpecies Shun-lobi UENo DepartmentofZoology,NationalScienceMuseum(Nat.Hist) 3-23-1Hyakunin-cho,Shinjuku,Tokyo,169-0073Japan and Yoshiaki NlsHIKAwA BiologicalLaboratory,0temonGakuinUniversity, 2-1-15Nishiai,Ibaraki-shi,Osaka,567-8502Japan Abstract A new anophthalmicspeciesofthetrechinegenusTli・ec/1ia,Ilaisde- scribedfromtheSurikami-gawadrainageareaofnortheasternHonshu,Japan,underthe nameofTpa1lasaeta.Itisupperhypogean,inhabitingascreeoppositetothetypelocality of T oopte1・11sS.UENo,anendangeredspeciesrecordedontheRedDataBookof the JapaneseGovernment.Anewlocalityofthelatterspeciesisrecordcli,anditsprobabledis- tributional rangeisestimated. Trechiama oopterusS. UENo (1995,p. 154, figs. 7-9, 16) is amedium-sized anophthalmictrechinebeetleendemictotheupperpartoftheSurikami-gawadrainage area at the northwestern corner of Fukushima Prefecture in northeastern Honshu, Japan.It isrecordedontheRedDataBookoftheJapaneseGovernmentasanendan- geredspecies,sinceitstypehabitat,whichhadbeentheonly knownlocality of the speciesbefore2000,wasthreatenedbytheconstructionoftheSurikami-gawaReser- voir. Tofindoutother habitatsofthetrechinebeetleabovetheprospectiveponding surfaceofthereservoir,thestaffoftheCivilEngineeringandEco-technologyConsul- tantsCo., Ltd.andseveralmembersoftheFukushimaInsect-lover'sAssociationmade acareful survey of theareaconcernednear theendofOctober 2000, inwhichthe secondauthor tookpartasoneofthediscoverersoftheendangeredspecies.Unfortu- nately, thefirstauthorwasunabletoparticipateinitashewasinChinathen,buthe was invitedto thesecondsurveycarriedout inMaythisyear, just beforethefinal proofreadingofthispaper,andcarefullyexaminedtheenvironmentagain. Thefirstattemptprovedasuccess,andasecondhabitatofthebeetlewaslocated attheothersideofthelowridgeabout1.6kmnorthwestofthetypelocalityandabove 250 Shun-lobiUENoandYoshiakiN1sHIKA、、,A thepondingsurface.Whatwasunexpectedwasthediscoveryofadifferentspeciesof anophthalmic trechinebeetle fromascreelyingon theopposite sideof themain courseof the Surikami-gawaRiver, 1.7kmnorthwest of thesecond locality ofT oopterus.ThisnewlyfoundspeciesisverysimilartoToopterusingeneralappearance andhardlyrecognizableinthefiefd,Lbutexternallydiffersfromthelatterinthechaeto_ taxyofthepronotumandelytra.Specificdifferencebetweenthetwospeciesisdecisjve intheconfigurationofthemalegenitalia.whichindicatesthattheybelongtodifferent lineagesoftheechigonissubgroupandthatthesecondspeciesisrelatedte l:nlasa_ takaiS.UENooftheZaoMountains.Thescreeinw、lichthisspeciesdwellsishigher f「omtheprospectivepondingsurfacethanthetypehabitatofToopte1・us,butitssur_ viva1canbethreatenedbydroughtcausedbydeforestationintheclosesurroundingsof thereservoir,particularlyduetoroadconstruction.Wearethereforegoingtodescrjbe itinthepresentpaperunderthenameofTrechianlapauclsaetainordertorecorditas athreatenedspecies. Theabbreviationsusedhereinarethesameasthoseexplainedinpreviouspapers bythefirstauthor. Wearedeeplyindebtedtothefollowingpersonswhosecarefulinvesljgatjonsled tothediscoveryofthisinterestingtrechinebeetle:Mr.HiroshiFUKAzAwA.Mr.Takeshj NODAandMs.ShineMoRIsHIGEoftheCivilEngineeringandEco-techno1ogyconsul_ tantSCo.,Ltd.,andMessrs.Jun'ichiroKOBAYASHI,ShozoMlzUNoYAandTadaoSAIT0 oftheFukushimaInsect-lover'sAssociation. T「eChianla(S.St「.)paucisaetaS.UEN0etY.NlsHIKAwA,sp nov. (Figs.1-3) Len9th:4.60-5.40mm(fromapicalmarginofclypeustoapicesofelytra). CloselysimilartoTnlasataka1S.UENo(1983.p.12,figs6-7; I985a,p 75,pl 14,fig.16)ingeneralappearance,butreadilyrecognizedontheabsenceofpostangu_ Ia「Pal「ofmar9ina1setaeonpronotumandpreapica1setaoneachelytron.Besides,the P「onOtumisrelativelylong,andtheelytrahavemoreeffacedshoulders deeper strjae andme「ewidelydistantdorsalpores.Decisivelydi?erent fromT,nasatakajalsojn theConfigurationofaedeaga1apicallobe,whichismuchlongerandslendererthanjn thelatterspecies. Co1ou「asinTmasatakai,thoughtheforebodyisusuallyalittlelighter.Headas inTmasatakaI thoughtheantennaearesomewhatshorter.usuallyreachingthemjd_ dieofelytrainbeth and butonlyreachingbasal four-ninthsofelytrajncertajn , females.P「onotumalittlelongerthaninT:masataka1、widestatalevelbetweentwo_ thi「dSandfive-seventhsfrombase,andalittlemoregraduallynarrowedposterjadthan ante「lad;PW/HW140-1.52(MI46),PW/PL1.05-1.11(M1.08),pW/pA146_156 (MI53),PW/PBl38-1.51(MI43);sidesalittlelessstronglyarcuateinfront,alit_ tielessdeeplysinuateataboutbasal fifthandusuallylessdivergenttowardshjndan_ 9leSbehindante-basal sinuation; apexalwaysslightly narrower than base. PB/PA 251 252 Shun-lobiUENoandYoshiakiNIsHIKAwA 1.03-1.11(M1.07) [PA/PB0.90-0.97(M0.94)]; frontanglesroundedandslightly produced forwards; hindanglessharp, postero-1atera11y protrudent anddevoid of postangularsetae thoughoneof themaleparatypesbearsapostanguIarsetaat the rightside. Elytraoval、moreregularlyconvexthaninTmasatakai thoughmoreor lessde- pressedinbasalareas,usuallywidestataboutbasal four-ninths,atleastslightlybefore themiddle,andalittlemoregradually narrowedtowardsapicesthantowardsbasest EW/PW171-1.77(M I73),EL/EW137-1.45(M I42);shouldersmorecompletely effaced than in T masataka1, with moreobliqueprehumera1borders; sides rather widelyreflexed,gentlyarcuateinfront,lesssobehindmiddle,andalmostconjointly roundedatapices,eachwithaveryslightpreapica1emargination;striaeentire,deeper thaninT nlasatakai, faintlycrenulate;scutellarstrictodistinct apicalstrictodeep. joiningstria5withoutappreciablesinuation:nosetiferousdorsalporeonstria3,stria 5withtwosetiferousdorsalporesat l/8-l/6(usuallyatabout1/7)and1/2-2/3(usu- allyatabout5/9)frombase,respectively,thetwoporesbeingmorewidelyspacedthan inTnlasataka1;preapica1porealwaysabsent.LegssomewhatstouterthaninTmasa- ta ｽal Malegenitalorganseeminglylargeandmoderatelysclerotize thoughverylong apical lobeisincludedinitslength、similarinmanyrespectstothatofTmasataka1, but theapical lobeismuch longer andmuchslenderer indorsal view, thesagittal 3 - /、 、/一一一・一一ーノ/ 0.5 mm Fi9S. 2-3. Male9enitaliaofTli'ec1/ia'11c1(s.str)pt1llclsaelaS.UENoetY.NlsHIKAwA,sp nov.,fromNago ofMoniwainIizaka-machi;leftlateralview(2),andapicalpartofaedeagus,dorso_apjca1vjew(3). No、vThreatenedT,・ec1/i1t,1111fromNortheastJapan 253 aileronislargethoughnarrow、theleftproxima1teeth-patchinsidetheinnersacisof differentconformation,andthestylesaremuchbroaderat theapicalparts.Aedeagus aboutthree-eighthsaslongaselytra, lightlydepressed,notarcuateatmiddlethough thebasalpartiselongateandstronglycurvedventra withthedorsalmarginsemicir- cularly roundedbeforemiddle inprofile: basal orificelarge,with thesidesdeeply emargjnate;sagittalaileronlargebutnarrow,protrudingventrad;vieweddorsally,api- calpariverylong,graduallytaperedintonarrowapicallobe,whichisveryslightlyin- cljnedtotheleftandindistinctlytuberculateattheextremity;viewedlaterally,apical lobenarrow,graduallytaperedapicad,veryslightlycurvedventradinapicalhalf,and sljghtlyturnedupatthetuberculateextremity;ventralmarginnearlystraightinProfile except forthesubapicalportion.Innersacarmedwithathincopulatorypieceabout two_njnlhsaslongasaedeagusandtwopatchesofsclerotizedteeth;copulatorypiece sjmjlar10thatofTmasataka1but theapexissimplypointed,notventrallyp「educed; leftproximal teeth-patchformedbyasomewhat irregularrowoflargelamellarteeth andobviouslysmallerthaninTmasataka1asawhole;rightapical teeth-Patchhori- zontalandcompact,thininlateralviewbutwidelyroundedasawholeindorsalview. styleslarge、broadattheapicalparts,leftstylebeinglargerthantherighteachusually bearjngfourapjcalsetae,whicharesometimessupplementedbyasmallerminute extraseta. Type series. Holotype: (5, allotype: 30-X-2000, Y. NISHIKAWA Ie9. , Paratypes:5 2 30-X-2000,Y.NIsHIKAwA,J.KOBAYASHI&T.NODAle9.;2 , , , 2001.S.UEN0.J.KOBAYASHI&S.MORISHIGEleg.AlldepositedintheCo1- 1 13_V_ 1ect,jonoftheDepartmentofZoology、NationalScienceMuseum(Nat.Hist),Tokyo. Typelocality. Nago 330minaltitude,ofMoniwainIizaka-machi、Fukushima- shi,FukushimaPrefecture,northeasternHonshu,NortheastJapan. ThjsnewspeciesisdoubtlesscloselyrelatedtoTmasataka1oftheZao Notes. Mountajns,asisclearlydemonstratedbythesimilarityofthemalegenitalia,whicha「e jdentjca1jnbasjc conformationbetweenthetwo. However, it isdecisively different fromthezaospecjesintheabsenceofthepronota1postangularandtheelytralp「eapi- ca1setaeaswellasinthemuchlongerandslendererapicallobeoftheaedeagus.LOSS of both the setaespecified above is seldom found in themembers of the9enuS T1-echjama,exceptinthoseofthelavlcolasubgroup(cf.UENo,1960,1972,1989)・and evenlossofthepreapica1setaealoneisexceptional,thoughitisoneofthediagnostic featuresof thetamaensIssubgroup(cf.UEN0,1981;UEN0&SONE,1994)・ASCom- paredwjththepreapica1setaeontheelytra,thepostangularsetaeontheP「onOtuma「e more frequently lost, andconstantlysoin theo川and. !fa!Complexes of theo川 group(cfUENo,lg85b).Thus,TpaucIsaetacanberecognizedsolelyonthelossof thetaxonomicallyimportanttactilesetaeonthepronotumandelytra,thou9h「eve「SOin ofthepostangularorthepreapica1setaemayrarelyoccurononeSideasWasPointed out jnseveralspeciesoftheta111aensisandthelavlcolasubgroups.F「omToOPte「uS, thepresentspeciescanbereadilydiscriminatedbythelossofthetwoimPO「tantSetae andthedjff,erentlyshapedmalegenitaliaaboveallbythepeculiarlymodifiedaedea9a1 254 Shun-lobiUENoand YoshiakiNlsHIKA゛A apical lobe(cf.UENo,1995,figs.10-22onp. l59). Thetypehabitatofthisinterestingspeciesislocatedinasidegully ontheleft sideof themaincourseoftheSurikami-gawaRiver,about 13kmwestbynorthof Nagoandonly500mremovedfromtheMiyagiborder.Anarrowstream owsdown thegullyshadedbydeciduousbroadleavedtrees,exposingsteepgreentuffslopeson eitherbankatbends.Mostofthemarebareandconsolidate(i,butthereisafairlylarge oneontheleftsidewhose foot isthicklycoveredwithsoil mingledwith fist-sized tuffaceousgravel (cf.Fig 4).Itisthisscreethatisinhabitedbythenewtrechinebee- tle.Allthespecimensknownweredugout fromthedepthof30-70 cmat thecentral partofthescree.wheretheupperhypogeanzonewasveryhumidbeing tedbyaseep- age.Wehavemadeextensivesearchesforanophthalmictrechinesinthisandnearby gullies,buthavesofarbeenunabletolocateanyotherhabitatsofTpauclsaeta nrechia'na(s.str)oopterusS.UENo,1995 Tli'ec/1la'fia(s.str)oopte1'itsS. U No,1995,Mom natn.Sci.Mus.,Tokyo,(28),p.154, gs7-9,16; pc locality:TogamimukaiofMoniwainlizaka-machi. d 加onaf spec加ens exa1ml7ed. 3 1 Nakatsu-gawa Valley, 330m alt., , , Moniwa, Iizaka-machi, Fukushima-shi. 30-X-2000, Y. N1sHIKAwA. T. SAITo, J. KOBAYASHI &S. MIZUNOYAleg; Ie,samelocality, 14-V-2001,J. KOBAYASHI leg. (allNSMT). Motes. Aswasnoticedintheintroductionofthispaper,asecondhabitatof oopfenfswasdiscoveredinlastautumnat thenorthernsideofthesameridgeasthe typehabitat lies. Itwasascreeabout7mwidelyinginasidegullyoftheNakatsu_ gawa,atributary of theSurikami-gawaRiver. What ispeculiar isthat thescree is formedabout 8mabovethewaterofthestream owingthroughthegully,anddoubt_ lessforthisreason,itissubjecttoseasonalchangesoftheclimate.Whenwerevisited theplaceinthisspring,thesurfaceofthescreewascompletelydriedup, forminga hardcrustbakedbythesun.However,theupperhypogeanzonebelowwastosuchan extentprotectedbythecrustastokeepitsdeepestpartsufficientlyhumid forharbour_ ingtheanophthalmictrechine.All thefivespecimensof oopferzfs recordedabove werefoundinthisscreeatadepthof50-120cm. Thetwoknownhabitatsof「oopfertfsarelocatednearthezonewherethelapilli tu formationofNeoceneoriginmeetsthegranitebodyofCretaceousorigin.Judging fromgeologicalandtopographicalevidences,occurrenceofthistrechinebeetleseems tobeconfinedtoasmall lapillituffareaat thenortheasternendoftheNanatsumori Ridge,whichissurroundedby theSurikami-gawaRiver, twoof itstributaries, the Karasu-gawaandtheNakatsu-gawa,andthelargegranitebody. It ispossiblethat in Fi9S.4-5. Habitat of Tli'ec/1ia'Ila(s. str)patlclsaetaS. UENo et Y. NlsHIKAwA, sp nov.,atNagoof Moniwa. - 4.Screedepositedatthefootofasteepslopeofgreentuff. - 5.Close-upofthecen_ tralportionoftheabovepicture,showingthebeginningofexcavation.PhotoS.-I.UENo. c、、Threatened71't,l,1/1l1111l11l-()ru 'orthca・fIat、an つ、'、 256 Shun-IchiUENoand YoshiakiNlsHIKAwA formertimes,thedistributionalrangeofthebeetlemayhaveextendedsoutheastwards beyondtheKarasu-gawaValley,sincethesamelapillituffformationextendsinthatdi- rection. However,thehillyareaontherightsideoftheKarasu-gawahasbeencom- pletelydestroyedbythequarryingofstoneblocksforconstructingthelargedam. Itistoberegrettedthat thetypehabitatofToopteruswillbesubmergedinthe reservoir withina fewyears,but thetrechinespeciescansurvivesomewhereinthe small lapilli tuffareaspecifiedabove,eventhoughitisnoteasytolocateitsprecise habitatsduetopaucityoffavourabletalusesorcolluvia. 要 約 上野俊一・西川喜朗:東北地方で見つかったナガチビゴミムシ属の1新危急種. - 福島県 の北西端, 福島市飯坂町茂庭名号の摺上川ダム建設予定地の近傍で発見された, ナガチビゴミ ムシ属の1盲目種を新種と認め, モニワメクラチビゴミムシTli,ooh!ama(s.str)patlclsaetaS.UEN0 etY.NIsHIKAwAという新名を与えて記載した. この新種は,措上川の対岸で発見され, 絶減危惧 種として環境省版のレッド・データ・ブックに登録されている, スリカミメクラチビゴミムシ Toopte1・,,sS.UENoに体形が酷似しているが, 雄交尾器の形状からみて, 系統がやや異なるザオ ウメクラチビゴミムシT,nasataka,S.UENoに近縁のものと考えられる. それほど広くない川を 挟んで別種のチビゴミムシが生息していること自体が希有の例だが, そのいずれもが絶減の危 惧される状態にあるのはさらに驚くべきことである. ただし, モニワメクラチビゴミムシのす んでいる地下浅層は, スリカミメクラチビゴミムシの基準産地に比べると湛水予定面からの比 高が大きいので,斜面の上部をおおう樹林が保全され,地下環境の湿度が飽和状態に保たれれ ば, 種の存続の保証される可能性が高い. References UENo,S.-I.,1960. AnewblindtrechidfoundinalavacaveofJapan. Me,n. Coll.Sci.Un、j: 、,etc, (B), 27:49-58. - 1972. Anewanophthalmicn'echlama(CoIeoptera,Trechinae)foundinanoldmineoftheIzu Peninsula,CentralJapan. A,1notnes. -oo1.Jlpon.,To(kyo,45:111_117. - 1981. 'ec/11a'Ila ta1'1ae'Isis(Coleoptera, Trechinae)and itscloserelatives. Me,11. ,lam. sci' Mus.,To(kyo,(14):117-l32. 一 1983. NewanophthalmicT1・iec/1ia,Ila(Coleoptera,Trechinae) fromtheupperhypogeanzoneof NortheastJapan. Jspe/eo/.Soc.Japan,8:7-17. - 1985a. Carabidae (Ncbriinae,Elaphrinae, Loriccrinac,Scarilinae,Broscinae, Trechinae) In UE-N0,S.-I.,Y.KUROSAWA&M.SAT0(eds),TheCo/eopte,-aofJapanlnColo,-,2:54_88[jncI.pls. 11-16].Hoikusha,Osaka.(InJapanese,withEnglishbooklille) - 1985b・ The9rOupofT1''ec/ua1naon1(Coleoptera,Trcchinae) - itsdistributionanddifferentja_ tion -. Meinnat'1.ScI.Mtls., lo(kyo,(18):163-l98. - 1989. AnewanophthalmicTtlec111anla(Coleoptera,Trechinae)fromnearthelipoftheIzupenjn_ sula,CentralJapan. J.spe/eo/.Soc.Japan,14:23-27. - 1995・ TheanOPhthalmicT1'echla'na(CoIeoptera,Trechinae)fromtheNunobikiHillsandthejr Su「「oundingareas. Mellinat,1.Sci.Mtls.,「okvo,(28):147-163. - & S.SONE,1994. Newanophthalmictrechinesofthe「,-ec1/1a,nata,11ae,Isiscomplex(coleoptera, Trechinae). Eli・t1・a,T〔()k、、o,22:207-213.