Five New Species of the Lathrobium (s. str.) nomurai Group (Coleoptera, Staphylinidae) from Japan

14 Pages·1998·12.5 MB·English

by  Watanabe, Y

E、l t,・a,710k、,o,26(1):85-98.May15,1998
FiveNewSpeciesoftheLathrobium(s.str)nomura1
Group(Coleoptera,Staphylinidae) fromJapan
Yasuaki WATANABE
LaboratoryofEntomology,TokyoUniversityofAgriculture,
Tokyo,156-8502Japan
Abstract Five new speciesof the Latht'obiun1(s. str) '10'tlut'al group are de-
scribedunderthenamesL.(s.str)tanakai,L.(s.str)o;ldaiense、L.(s.str)hikosanense,L.
(s.str)daise,1sant″nandL.(s.str)moritai.Theyweremainlyobtainedfromtheupperhy-
pogeanzoneofmountainareasinSouthwestJapan.
Ninespeciesof theLat;1,-obium(s.str)nomuraigrouphavehithertobeenre-
portedfromJapanbyNAKANE(1955,p29)andWATANABE(1980,p 21;1986,p688;
l987, pp 8,11; 1991,pp. l45, l49,151, 153; 1996,pp. 10-11); fivespecies from
Honshu, three fromShikokuandone from Kyushu. Themembersofthisgroupare
mainlyfoundintheupperhypogeanzoneofmountainareasinJapanandcharacterized
bylargebody,vestigialeyesanddegeneratedhindwings.Thesemorphological fea-
turesofthegrouparesimilartothoseofthegroupofL. (s.str)pollens,thoughitcan
bedistinguishedfromthelatterbythereddishcolourofbody,andheadandelytranot
transverse.
ExaminingthemembersofthegenusLat;1,-obiumfromJapan, Ihave foundfive
interestingspeciesbelongingtothisgroup.A量eracarefulexamination,ithasbecome
clear that theyarenew tosciencebecauseofdifferentconfigurationofmalegenital
organ.TheywillbedescribedinthepresentpaperunderthenamesL.(s.str)tanakai,
L. (s.str)o11daiense,L. (s.str)1tikosanense, L. (s.str) daisensanumandL. (s.str)
met・ital. Thetypespecimensofthenewspeciestobedescribedaredepositedinthe
collectionoftheLaboratoryofEntomology,TokyoUniversityofAgriculture,except
forthehole-andallotypesofL. (s.str)ohdaiensewhicharepreservedinthecollec-
tionoftheDepartmentofZoology,NationalScienceMuseum(Nat.Hist),Tokyo.
Beforegoingfurther, IwishtoexpressmyheartythankstoDr.Shun-lobiUENo,
VisitingProfessorat TokyoUniversity ofAgriculture, for hiskindnessingivingme
theopportunitytostudytheinterestingspecimensandvaluableadviceonthepresent
study.ThanksarealsoduetoDr.Y.NIsHIKAwA,Messrs.K.MATSUMOTO,S.MORITA,T.
SHIMADAandS.TANAKAfortheirkindnessinprovidingmewithspecimensusedinthe
presentstudy.
86 Yasuaki WAIANABE
Lathrobium(s.str)tanakaiY.WATANABE,sp nov.
(Figs. l,2,7-9)
[Japanesename:Tanaka-kobane-nagahanekakushi]
Bodylength:10.0-13.0mm(from frontmarginofheadtoanalend);5.3-5.8mm
(fromfrontmarginofheadtoelytralapices).
Bodyelongate,subdepressedaboveandparallel-sided.Reddishbrownandmod-
eratelyshining,withheadandpronotumsometimespaler,palpi, legsandanalendyel-
lowishbrown.
Male. Headsuborbicularandgentlyelevatedmedially,aslongasbroa widest
atbasalthirdandmorestronglynarrowedanteriadthanposteriad;lateralsidesarcuate;
frontalareabetweenantennaltuberclestransverselyflattenedandimpunctate,provided
withaconspicuous setiferouspuncture insideeachantennal tubercle; disc sparingly
coveredwithdistinctsetiferouspunctures,except forsmallsmoothvertexa1area; lat-
ero-posteriorpartsalsowithsetiferouspunctureswhicharecloserandfiner thanthose
onthedisc;eyesverysmallandalmost at,theirlongitudinaldiameteraboutone-sixth
aslongasthepostocularpart.Antennaeextendingtoposterior fifthofpronotumand
not thickenedtowards theapicalmost,basal twosegmentspolished, theremainings
opaque;1stsegment robustanddistinctlywidenedapicad,morethantwiceaslongas
broa 2ndwellconstrictedatthebase,1.5timesaslongasbroad,butahalfaslongas
and somewhat narrower than 1st (2nd/1st=0.80), 3rdremarkably longer thanbroad
(length/width=1.75)andalittlelongerthoughasbroadas2nd,4thto7thequal inboth
lengthandwidth tooneanother,eachsomewhat longer thanbroad(length/width=
1.25), 8thand9th subequa1inboth lengthandwidth toeachother, each slightly
shorter (8th/7th=0.90) thoughas broadas 7th, 10th somewhat longer than broad
(length/width=1.25)andequal inlength tobutslightlyshorter than9th(10th/9th=
0.91),apicalmost fusiform,twiceaslongasbroadandl.5timesaslongasbutslightly
narrowerthan10th(apicalmost/10th=0.94),subacuminateattheapex.
Pronotumoblongandnearlyparallel-sidedorveryfeeblynarrowedposteriad,ap-
parently longer than broad (length/width=1.31) and distinctly longer (pronotum/
head=1.24)butslightly narrower(pronotum/head=0.94) thanhead, lateralsidesal-
moststraight except nearanteriorandposteriarangles,anteriormargingentlyand
broadlyrounde posteriormarginnearlytruncated,anterioranglesobtuseandnotvisi-
blefromdorsalside,posterioronesrounded;surfacemuchmorecloselycoveredwith
strongersetiferouspuncturesthanonheadexcept for anarrowmediansmoothline
through the length of pronotum. Scutellum subtriangular, sparsely scattered with
somewhatcoarsesetiferouspuncturesandcoveredwithmicroscopicgroundsculpture.
Elytra trapezoidal, distinctly narrowed anteriad, slightly longer than broad
(length/width=1.06) andslightly broader (pronotum/head=1.06)butalittleshorter
(pronotum/head=0.86) thanpronotum; lateralsides feeblyarcuate,posteriormargin
broadlyemarginateat themiddle; posterioranglesbroadly rounded; surfacemore
closelyandmoreroughlypuncturedthanonpronotum,bearingavaguedepressionbe-
NewSpeciesoftheLath,-obiutnno,,11uaiGroup 87
Fig. 1. Lathrobium(s.str)tanakaiY.WATANABE、
sp nov., , from Mt.Gomanodan-saninWaka-
yamaPrefecture.Scale:1.0mm.
hjndscutellum.Hindwingsdegeneratedtominutelobes.Legsmoderatelylong;profe-
murmarkedlythickened,thoughabruptlyconstrictednear theapexandexcavatedon
theinnerfaceinapicalhalf,sothattheapicalpartoftheexcavationformsabluntsub-
triangulartooth;protibiadilatedapicad,hollowedontheinnerfaceinbasalhalf;meso-
andmetatibiaesimple; 1st to4thprotarsa1segmentsstronglywidened;meso-and
metatarsithin.
Abdomenelongate,slightlywidenedtowardsthe7thsegmentandabruptlynar-
88 Yasuaki WATA1'、ABE
rowed fromthe8thtoanalend;3rdto7thtergiteseachtransverselydepressedalon9
basalmarginandmoderatelycloselycoveredwithfinesuperficialpuncturesontheSu「一
face,8thtergitesparinglyandmuchmorefinelypuncturedthanonthepreCedin9to「一
gjtes;8thstemitealmosttruncatedorfeeblyemarginateatthemiddleofPesto「Oi「ma「一
gin,narrowlylongitudinallydepressedalongthemedianline,surfaceofthedepression
smooth,eachsideofthedepressionmorecloselyclothedwithfineblackishsetaethan
jnotherparts;7thsternitegentlyemarginateatthemiddleofposteriorma「9in,P「o-
vjdedwjthalongellipticaldepressionatthemiddleinfrontoftheemargination,Su一「
faceofthedepressionsmooth,eachsideofthedepressionsomewhatmoreCloselySe-
tosethaninotherparts.
Genjtalorgannearlyspindle-shaped.Medianloberelativelybroad,widestatbasal
thirdandmorestronglynarrowedbasadthanapicad,withventralscleritewidestnea「
themjddleandmorestronglynarrowedapicadthanbasad,apicalpartveryslende「and
1'1,M''、'
f,・,',「 1
.
,.
-
5
Figs. 2_6. LastthreeabdominalslernitesinmaleofLat/1''obium(s.str)spp.,L.(s.str)tanakaiSP nov.
(2),L. (s.str)o/ldaiensesp nov. (3), L.(s.str)hikosa,tensesp nov.(4),L. (s.str)daisensanumSP
nov.(5)、andL.(s.str)tno,-italspnov.(6).Scale:1.0mm.
NewSpeciesoftheLath,-obiumno,nta-alGroup 89
acutelypointedat theapex.Fusedparamereasymmetricalanddistinctlylonger than
medianlobe,abruptlyconstrictednearthemiddle,andthenapparentlytaperedapicad,
stronglycurvedto therightinapicalhalfasseen fromdorsalsideandcurveddorsadin
apicalpartinprofile.
Female. Similar in faciestomale,but theapical twoabdominal sternitesare
simple.
Typeset'les. Holotype,(3,Mt.Gomanodan-san,Ryujin,WakayamaPref.,Hon-
shu,Japan,3-Vm-1991,S.TANAKAleg;allotype, , samelocalityandcollectoras
above,27-Vm-1991.Paratypes:1d,2 ,samedataas for theholotype;2 d,same
dataasfortheallotype;1d,0kusenjo(0nodani),Totsukawa-mura,NaraPref.,Hon-
shu,Japan,17-Vm-1991,S.TANAKAleg.
Dist,-ibutio,1. Japan(centralHonshu:KiiPeninsula).
Remarks. Ingeneralappearance,thepresentnewspeciesissimilar toL.(s.str)
kishuense,butdiffers fromitinthefollowingpoints:bodymoreorlesssmaller,head
aslongasbroad,pronotumslightlynarrowerthanhead;8thabdominalsterniteinmale
moreshallowlyemarginateat themiddleofposteriormarginanddistinctlyglabrous
alongthemedianlinebeforetheemargination;malegenitalorganwithfusedparamere
stronglycurvedtotherightinapicalhalf.
Bionomics. AccordingtoMr.S.TANAKA'sinformation, thetypespecimensob-
tainedonMt.Gomanodan-sanwere foundintheupperhypogeanzoneinamixed for-
Figs. 7-9. MalegenitalorganofL. (s.str)tanakalY.WATANABE,sp nov;dorsalview(7), lateralview
(8),andventral view(9).Scale:1.0mm.
90 Yasuaki WATA1、;ABE
estofdeciduousbroadleavedtrees, tagusc・,enataandQtle,-cuscrispltta,andconifer-
ous trees, Ables firma and Tsuga sieboldii, at an altitude of about 1,280m. One
paratypeobtainedonMt. 0kusenjo,whichisabout IOkmdistanttothesouth-south-
eastfromRyujinSpa,wasalsofoundintheupperhypogeanzoneoftheOnodaniatan
altitudeofabout1,060m.
Ety,no1ogy. ThepresentnewspeciesisnamedafterMr.ShotaroTANAKA,Shira-
hama-cho,whokindlysuppliedmewiththespecimensofthetypeseries.
Lathrobium(s.str.)ohdaienseY.WATANABE,sp nov.
(Figs 3,10-l2)
[Japanesename:0hdai-kobane-nagahanekakushi]
Body length:9.4-10.4mm(fromfrontmarginofheadtoanalend);4.8-5.6mm
(fromfrontmarginofheadtoelytralapices).
MaleandFemale. Infaciesresemblestheprecedingspecies,butcanbedistin-
guishedfromitbythedarkercolour,somewhatsmallerandnarrowerbody,andthefol-
lowingpoints.
Headwith lateral sideslessarcuateandmorenumerously puncturedonlatero-
posterior parts; pronotum distinctly narrowedposteriad, notsolong(length/width=
1.27)asintheprecedingspeciesandasbroadashead,surfacesimilarlypuncturedto
that ofhead; elytrarelativelyshort, nearly as longasbroadandmuchshorter than
pronotum (elytra/pronotum=0.82), surfacemoresparingly andslightly moredeeply
punctured;inmale,8thsternitesubtriangularlyexcisedatthemiddleofposteriormar-
gin and longitudinally depressedalong themiddlein front of theemargination; 7th
sternitemoreshallowlyexcisedatthemiddleofposteriormarginthan8thsterniteand
depressedbeforetheexcisioninthe formofahorseshoe.
Malegenitalorgansimilar ingeneralappearancetothatoftheprecedingspecies,
butdiffersfromitinthefollowingpoints:ventralscleriteofmedianlobemuchbroader
at theposterior thirdandmuchslenderer inapical third, acutelypointedat theapex;
fusedparamereslenderer,morestronglycurvedtotherightinapicalpartasseenfrom
dorsalsideandmuchmorestronglycurveddorsadattheapicalpartinprofile.
T、peso,-les. Holotype, (f, Mt. 0hdaigahara,Sanzukochi, Miyagawa-mura, Mie
Pref.,CJapan,24-VI-1984,Y.N1sHIKAwAleg;allotype, ,MtOhdaigahara,Nagoya-
dani,Kami-kitayama-mura,NaraProf.,CJapan,23-VI-1984,S.UENoleg.Paratypes:
1,3,samedataasfortheallotype;1,3,samedataasfortheholotype.
isfr1加f en. Japan(central Honshu).
Bio,1omlcs. Thetypespecimenswereobtained fromtwodifferentsitesonMt.
Ohdaigahara. Theholotypeandoneparatypewereobtained fromtheupperhypogean
zoneofSanzukochiatanaltitudeof1,400m.Theallotypeandoneparatypewerealso
obtainedfromtheupperhypogeanzoneoftheNagoya-daniatanaltitudeof1,550m.
Etymo1og、;. Thenameofthisnewspecies isderived from “Mt. 0hdaigahara”,
thetypelocality.
NewSpeciesoftheLath・obiu,110,ul,alGroup 91
Figs.10-12. MalegenitalorganofL.(s.str)ohdaIenseY.WATANABE,sp nov;dorsalview(10),lateral
view(ll),andventralview(12).Scale:1.0mm.
Lathrobium(s.str.)hikosanenseY.WATANABE,sp nov.
(Figs4, l3-15)
[Japanesename:Hikosan-kobane-nagahanekakushi]
Body length:9.5-10.5mm(from frontmarginofheadtoanalend);5.2-5.5mm
(fromfrontmarginofheadtoelytra1apices).
Maleand Female. Ingeneralappearancesimilar to L. (s.str)ohdaiense,but
differsfromitinthefollowingpoints.
Headmorestronglynarrowedanteriad,slightlylongerthanbroad(length/width=
1.03),surfacemoresparingly and lesscoarsely puncturedinlatero-posterior parts;
pronotum morestrongly narrowedposteriadandrelatively long,considerably longer
than broad (length/width=1.43) and a little narrower than head (pronotum/head=
0.90),surfacemorecoarselypuncturedexceptforasmoothlongitudinalmedianplace;
elytra as long asbroad, lateral margins lessarcuate, posterior marginmore deeply
emarginate,surfacemorecloselythoughlesscoarselypunctured;abdomenmorespar-
inglyandmorecoarselypuncturedonthesurface;inmale,8thsternitesemicircularly
excisedatthemiddleofposteriormarginandlongitudinallydepressedalong theme-
dian linein frontoftheexcision,apical part ofthedepressionprovidedwithasmall
subtriangularglabrousarea,7thstemitealsoshallowly,broadlyemarginateatthemid-
dleofposterior marginandellipticallydepressedat themiddlebeforetheemargina-
tion.
92 Yasuaki WAIANABE
15
Figs. 13-l5. MalegenitalorganofL.(s.str)hikosanenseY.WATANABE,sp nov;dorsalview (l3),lat-
eralview(14),andventralview(l5).Scale:1.0mm.
Malegenitalorgansimilarin faciestothoseofthetwoprecedingspecies,butdif-
fers fromthem in the followingpoints: Median lobemuchshorter than fusedpara-
mere,ventralscleritebroadandgraduallynarrowedtoneartheapexwhichissubtrian-
gularlypointed; fused parameremuchmoreelongateandmoregently curved to the
rightinapical fourthasseenfromdorsalside.
Typeseries. Holotype, Mt.Hike-san,FukuokaPref.,Kyushu,Japan,8~11-
,
IX-l997,T.SHIMADAleg;allotype, 9,samelocalityasfortheholotype,24-IX-l981,
S.MORITAleg.Paratypes:4 d,samedataasfortheallotype.
Distribution. Japan(northernKyushu).
Biono,mcs. Unknown.
Etymology. Thespecificepithetofthepresentnewspeciesisderivedfrom“Mt.
Hike-san”,thetypelocaity.
Lathrobium(s.str.)daisensanumY.WATANABE,spnov.
(Figs 5,16--18)
[Japanesename:Daisensan-kobane-nagahanekakushi]
Body length:9.2-10.4mm(fromfrontmarginofheadtoanalend);5.1-5.4mm
NewSpeciesoftheLat1l,・obiumno,I″t atGroup 93
(fromfrontmarginofheadtoelytralapices).
Similar ingeneralappearancetothethreeprecedingspecies,butcaneasilybe
distinguishedfromthembyconfigurationofmalegenitalorgan.
Male. Headsuborbicular,gentlyelevatedmedially,widestbeforeposterioran-
glesand feeblynarrowedanteriad; lateralsidesgentlyarcuate;surfacesparselyscat-
teredwithdistinctsetiferouspuncturesexcept forsmallmedianareawhichisglabrous,
thepuncturesbecomingmorenumerousandsmallerinthelatero-posteriorareasthan
ondisc. Antennaeelongate,similar inarticulation to thoseof thethreepreceding
species.
Pronotumoblong,almostparallel-sidedinmedianpart,thoughmorestronglynar-
rowed inposterior fifth than in anterior fifth,evidently longer thanbroad (length/
width=1.40), distinctly longer (pronotum/head=1.26) though slightly
narrower
(pronotum/head=0.93)thanhead;lateralsidesnearlystraightexceptnearanteriorand
posteriorangleswhicharerounded,anteriorandposteriormarginsasinthethreepre-
cedingspecies,surfacedenselycoveredwithcoarsesetiferouspuncturesexcept fora
narrowmediansmooth linethroughthelengthofpronotum,butsometimesobscurein
anteriorhalf.Scutellumsimilar tothoseofthethreeprecedingspecies.Elytranearly
square, slightly dilated posteriad, as long as broad, apparently shorter (elytra/
pronotum=0.79) butalittlebroader (elytra/pronotum=1.11) thanpronotum, lateral
sidesgentlyarcuate,posteriormarginemarginateatthemiddleand formingare-en-
Figs. 16-l8. MalegenitalorganofL.(s.str)daisensan1″nY.WATANABE,sp nov.,dorsalview(l6),lat-
eralview(17),andventralview(l8).Scale:1.0mm.
94 YasuakiWATANABE
trantangle;surfaceratherdenselycoveredwithsuperficialsetiferouspunctures.Legs
similarinstructuretothoseofthethreeprecedingspecies.
Abdomenelongate,graduallydilated towardsthe7thsegment andabruptlynar-
rowed fromthe8thtoanalend;3rdto6thandanteriorhalfof7thtergiteseachclosely
coveredwithsuperficialpunctures,posteriorhalfofthe7thand8thtergitesmuchmore
sparinglyandmuchmorefinelypuncturedthanon thepreceding tergites; 8thstemite
subtriangularlyexcisedatthemiddleofposteriormarginandnarrowly,longitudinally
depressedalongthemedian line,eachsideof thedepressioncloselyprovidedwith
shortblackishsetae;7thsternitealsoshallowlyemarginateatthemiddleofposterior
marginandellipticallydepressedatthemiddleinfrontoftheemargination.
Genitalorganmorecloselysimilar inconfigurationtothatofL.(s.str)konpiraY,
WATANABE (l991, p. 149) than thoseof the threeprecedingspecies. Median lobe
widestat thebasal fourthandmorestronglynarrowedapicad thanbasad,evidently
shorterthan fusedparamere,ventralscleritebroaderandtruncatedat theapex.Fused
paramereslightlycurvedtotherightandgraduallynarrowedtowardsthepointedapex
indorsalview,surfaceprovidedwithafinelongitudinalcarinaoneachsideofmedian
part.
Female. Similaringeneralappearancetomale, thoughdiffering from it inthe
7thand8thabdominalstemiteswhicharenotmodified.
Typeseries. Holotype, (3, allotype, Mt. Daisen-san, Kotonami-cho, Naka-
,
tado-gun,KagawaPref.,Shikoku,Japan,25-X-1997,K.MATSUMOTOleg.Paratypes:
5 d4 ,samedataasfortheholotype.
fsf,・l加fen. Japan(northernShikoku).
Bio'10'nlcs. AccordingtoMr.K. MATSUMOTO, thetypespecimensofthisnew
specieswere foundunderstonesinagullyandinaheapofrockdebrisdepositedina
ditchattheroadsideinamixedforestofdeciduousbroadleavedtrees,Ptunussp and
Q1le'cus so'''ata, and theconiferous tree, Pin1lsdensjf1o,a, at an altitudeof about
700m
Et、,,no1ogy. Thenameofthepresentnewspeciesisderived from“Mt.Daisen-
san”,thetypelocality.
Lathrobium(s.str.)moritaiY.WAIANABE,sp
nov
(Figs6,19-21)
[Japanesename:Morita-kobane-nagahanekakushi]
Bodylength: 10.9-11.2mm(fromfrontmarginofheadtoanalend);5.l-5.7mm
(fromfrontmarginofheadtoelytralapices).
Thepresentnewspeciesresemblesthe fourprecedingspecies in facies, though
considerablydifferent fromtheminconfigurationofthefusedparamereofmalegeni-
talorgan.
Bodyelongate,nearlyparallel-sidedandsubdepressedabove.Colourdarkredand
moderatelyshining,withpalpiandlegssomewhatpaler.