Three New Gabrius (Coleoptera,Staphylinidae) from Japan

8 Pages·1991·7.8 MB·English

by  Shibata, Y

Elytra, Tokyo,19(1):85-92,May15,1991
ThreeNewGabr1i,ls(Coleoptera,Staphylinidae) fromJapan
YasutoshiSHIBATA
Tsurukawa3-8-13,MachidaCity,Tokyo,194-01Japan
Abstract Threenewstaphylinidbeetlesbelonging to thegenusGabi・iusarede-
ds scribedfromJapanunderthenamesofC.o alnofo1,C.1m1/f1りf1''1('fa「g an C./ap川e CMS
Theyarerelativelylarge-sizedwithinthegenusandhavepeculiarlyshapedmalegenitalia.
Gabrius,nultipunctatusisthefirstJapanesememberbearingninepuncturesintheinner
row on itspronotum.
TheGabriusfaunaofJapanwasstudiedbySHARP(1874, l889),CAMERON(1930),
BERNHAUER(1939), TOTTENHAM(1940)andSMETANA(1960,1973,1984),andfifteen
specieshavebeenrecordedup tothepresent.
ThroughthecourtesyofMr.]waoOKAMOTO, I haverecentlyhadanopportunity
to examine an interestingspeciesof thisgenus obtained at Anjtlkyo in Hiroshima
Prefecture,WestJapan. Onthisoccasion,IexaminedmanyspecimensoftheJapanese
speciescollectedat variouslocalities.
Afteracarefulstudy,itbecameclearthatthespeciescollectedatAnjukyoandtwo
morespeciesfoundincentralHonshuandHokkaidoarenewtoscience. Theywill
bedescribedinthepresent paper.
The following abbreviations are used in this paper: HL -greatest length of
head; HW - greatest width of head, including eyes; CL - longitudinal diameter of
eye; Pc -lengthofpostocular area;PL- length of pronotum, measured along the
mid-line; PW-greatest width of pronotum; F_L-greatest length of elytra; EW-
greatest widthofelytra.
Beforegoing further, I wish toexpressmycordial thanks toProfessor Yasuaki
WATANABEof TokyoUniversityof Agriculture for hiscontinuousguidance anden-
couragement,andtoDr.Shun-lobiUENooftheNationalScienceMuseum(Nat.Hist),
Tokyo, forhiskindnessextendedtomeinvariousways. Heartythanksarealsodue
toMessrs.T.GoH,A.IzUMl,S.NlsHGI AKI,1.OKAMOTOandN.YASUDAfor theirhelp
insupplyingwithmaterial,andtoMr.Akinori YosHITANl for hisassistanceinpre-
paringtheillustrationofwholeinsectandmalesecondarysexual charactersinserted
inthe presentpaper.
Gabriusokamotoisp nov.
(Figs.1-5)
Body elongate, nearly parallel-sided andmoderately shining. Head and pro-
86 YasutoshiSHIBATA
notum piceousblack to black; elytra, abdomen and antennaedark brown; mouth
partsandlegsbrownishyellow,innerportionoftibiaesomewhatdarkened.
Bodylength:7.0-7.5mm.
Headsubquadrate,slightlylonger thanwide(HL/HW=1.09),widestjustbefore
posterioranglesand indistinctlynarrowedanteriad, withlateralsidesslightlyarcuate;
fronstriangularlyandshallowly impressed, thediscalmost impunctate;medianin-
terocular punctureswidelyseparated, nearly fourtimesasdistant fromeachotheras
fromocularpunctures, postero-1aterallywithsparseandratherstrongsetiferouspunc-
tures; surfacecoveredwithmicroscopic transversely lineategroundsculpture. Eyes
smallthoughfeeblyprutrudingfrom lateral linesofhead,itslongitudinaldiameter a
little smaller than the length of postocular area (CL/Pc=0.76). Antennae long,
almost reaching the posterior margin of pronotum, and hardly thickened towards
apex, basal three segments polished, the remainings opaque, 1st segment dilated
apically,about3.5timesaslongasbroad,2ndaboutahalfaslongas1st (2nd/1st=
0.48)andabouttwiceaslongasbroad,3rdelongate,alittlelongerthan2nd(3rd/2nd=
1.30),4thto10thsubequa1inlengthtooneanotherand feeblydilatedtowardseach
apex,4thto6thgraduallyincreasinginwidth,7thto10theachaboutaslongasbroad
(width/length=1.03),theapicalmostsubacuminatetowardsthetip,alittlelonger than
10th(lith/10th=].38)andabout l5timesaslongasbroad.
Pronotumoblong,alittlelonger thanwide(PL/PW=1.24)andaboutaswideas
head(HW/PW=1.00),widestbehindanterioranglesandslightlynarrowedposterior-
ly; lateral sides almost straight as seen from above; anterior margin broadly
rounded, thoughsubtruncatedatmiddle, posterior margin feebly arcuate; anterior
anglesobtuseandnotvisiblefromabove,posterior anglesnarrowlyrounded;discon
eithersideof themiddlewithasomewhatirregular rowofsevenpunctures,andout-
sidethisserieswiththreeor fourpunctures;surfacecoveredwithveryfinemicroscopic
transversely lineate groundsculpture. Scutellumlarge, triangular, finely and dense-
1ypuncturedandpubescent,surfacewiththesamegroundsculptureasonpronotum.
Elytrasubtrapezoida1,somewhatdilatedposteriadandflatabove,slightly wider
than long (EW/EL=1.07), anda little longer thanpronotum (EL/PL=1.31), con-
siderablywiderthanpronotum(EW/PW=l.73);lateralsidesalmoststraight;posterior
angles broadlyrounded;surfacefinelyanddenselypunctured, anddenselycovered
with brownish pubescence decumbent backwards, devoid of microscopic ground
sculpture.
Abdomenelongate,slightlydilatedtowardsthe6thsegment whichisthewidest,
7thtotheextremitydistinctlynarrowed;surfacecoveredwithfineranddenserpunc-
turesandpubescencethanonelytra;8thsterniteinmalesomewhatdeeplyandwidely
emarginateatmiddleof posterior margin, whichbears numerous longand rather
strongsetaebecominggraduallyshorterbothmediallyandlaterally. Legsrelatively
long, protarsi thininbothsexes.
Malegenital organ relativelysmall but voluminous, well sclerotized and very
peculiar;medianlobegraduallynarrowedtowardsapex;fusedparamerebroad,strong一
ThreeNewGabi・iusfromJapan 87
5
4
Figs. l-5. Gabi・iusokamoto1spnov.,malegenitalorgan;ventralview(1),lateralview(2);dorsal
view(3)(scale:1.0mm);undersideoffusedparamere(4)(scale:0.3mm);andapicalpor-
tionofmaleabdominalsternite8(5)(scale:0.8mm).
1ywidenedanteriorly,andthenabruptlynarrowedatabout anterior fourth, forming
asharpangleoneachside,anteriormarginsemicircularlyemarginate;blacktubercles
ontheundersideofparamereseventoeightinnumber, formingtwoirregular longi-
tudinalrows,twoisolated tuberclesbeingpresentoneachlateralmarginatthecorner
ofnarrowedpart.
Typeso,1es. Holotype: Anjukyo,Kake-cho,Yamagata-gun,HiroshimaPref.,
,
20-X-1990,1.OKAMOTOleg; paratypes: 3 ,samedataas for theholotype; 1
,
Nakatsuya,Yoshiwa-mura,HiroshimaPref.,28-V1l-1990,1.OKAMOTOleg.
Theholotypeis depositedin thecollectionof the Laboratory of Entomology,
Tokyo University of Agriculture, and theparatypes arepreserved in the author's
privatecollection.
fsfr1加rio/7. Japan(westernHonshu).
Notes. Ingeneralappearance,thisnewspeciessomewhat resembles (J.unze11e'Isis
BERNHAuER,butcanbereadilydistinguishedfromthelatterbythelargerandrobust
body,differentstructureofmalegenitalorganandsecondarysexualcharactersofthe
last abdominal sterniteinthemale.
All thespecimensof thetypeserieswerefound fromheapsofwet fallen leaves
accumulatedbythewateratthesidesofanarrowstream.
89 YasutoshiSHIBATA
(iabriusmuMpunctatussp nov
(Figs 6-11)
Closelysimilar toG.okamoto1inexternal features,butcaneasilybedistinguished
fromthelatter bythefollowingpoints: bodylargerandmorerobust; longitudinal
diameter of eye muchsmaller than the length of postocular area (CL/Pc=0.62);
innerdorsalrowof puncturesonpronotum composedof eight to nineones, usually
nine;elytraabout asbroadas long(EW/EL=0.99); differentlyshapedmalegenital
organandsecondarysexualcharacterofabdominalsterniteinmale.
The ratiosofbodypartsaresummarizedasfollows:HL/HW=1.09;PL/PW=
1.32; HW/PW=1.02; EL/PL=1.30, EW/PW=1.69. Body length:8.0-8.5mm.
Fig 6. (Jabrius '111lltipunctatltssp nov., (f, from Akazawa Spa in Yamanashi prof. (scale
2.0mm)
Three NewGabi・lusfromJapan 89
、
n
-
8
Figs.7-ll. Gabi,1us/nu/ttpunctatla,sp nov., malegenital organ;ventralview (7); lateral view
(8), dorsalview(9)(scale:1.0mm);undersideoffusedparamere(10)(scale:0.3mm);and
apicalportionofmaleabdominalsternite8(11)(scale:0.8mm).
Male. Eighthsternitedeeplyandsubtriangularlyemarginateat themiddleof
posteriormargin,smalltriangularmedianareabeforetheemarginationflattenedand
smooth, latero-apical marginsof theemargination provided with rather strongand
verylongsetaebecominggraduallyshorterbothmediallyandlaterally.
Malegenitalorgan rather large,wellsclerotizedandverypeculiar;medianlobe
relatively broad, graduallyanddistinctlynarrowed towardsalmost truncatedapex;
fusedparamereverysmall,stronglynarrowedtowardsapical margin, whichisshal-
lowlyandsubtriangularlyexcisedat themiddle; undersideof paramerewith about
five black tuberclesoneachsidenear theapex.
Typeseries. Holotype: AkazawaSpa,Masuho,YamanashiPref.,4-V-1974,
,
Y. SHIBATAleg ; allotype: ,same data as for the holotype. Paratypes: 1 , same
dataas for theholotype;1 Gozaishi, Yamanashi Pref., 27-VI1-l967, Y.SHIBATA
,
leg; 2 Kinzandaira, Sudama, Yamanashi Prof., 25-VIII-1986, Y. SHIBATA
,
leg; 1 , Mt. Sobatsubuyama, Haibara, Shizuoka Prof., 21-VIII-1986, A. IzuMI
leg ;1 Kanamegawa, Minoge,KanagawaPref.,18-X-1986, A.IzMuI leg.
,
The hole- andallotypes aredeposited in the collectionof the Laboratory of
Entomology, TokyoUniversityofAgriculture,andtheparatypesarepreservedinthe
author'sprivatecollection.
1srrlOt'f,on. Japan(central Honshu).
90 YasutoshiSHIBATA
^/otes. This peculiar newspecies can beeasily distinguished from the other
Japanesespecies by havingnine punctures in the inner row on the pronotum and
uniquelyshapedmalegenitalia.
Variation in thedorsal rowsof punctureson thepronotum isas follows: ofthe
eightspecimensof the typeseries, three(2 1 )lackonepunctureon oneside,
,
and one(1 ) on bothsides.
ss Ga(cid:0)加r J 'aponlcM s
nov.
(Figs.12-16)
ThepresentnewspeciesalsocloselyresemblesG.okamoto1ingeneralappearance,
but differs from it in the followingpoints: body little larger insize; head oval and
a
somewhat longer than broad (HL/HW=1.20), eyessmall and flat, its longitudinal
diameter muchsmaller than thelengthof postocular area(CL/Pc=0.64), punctures
of the inner dorsal row on pronotum six in number; elytraslightly longer than
pronotum (EL/PL=1.19); and differentlyshapedmalegenital organandsecondary
sexual character of 8th abdominalsternite in male.
,-
16
15
Figs.12-l6. Gabi'lusJaponlc1l.・lsp nov.,malegenitalorgan;ventralview(12);lateralview(l3);
dorsal view (14) (scale: 1.0mm); undersideof fusedparamere (15)(scale: 0.3mm); and
apicalportionofmaleabdominalsternite8(16)(scale:0.8mm).
ThreeNewGab・i1usfromJapan 91
Theratiosof bodypartsaresummarizedas follows: PL/PW=1.30; HW/PW=
0.91;EW/EL=1.08;EW/PW=l.66. Bodylength:7.5-8.0mm.
Male. Eighthsternitemoderatelyandratherwidelyemarginateatthemiddleof
posteriormargin,smallsubtriangularmedianareabeforetheemarginationflattened
and smooth,1atero-apica1margins of theemargination provided with rather strong
and longsetae, whichgradually becomeshorter bothmediallyand laterally, and of
which theinnermostshortsetaeextend for ashort distanceupwardsalongthelateral
marginof themediansmoothportion.
Malegenitalorganrather large,asymmetrical,wellsclerotizedandverypeculiar;
medianlobeproducedintoalongandslender projectionwhichismoreor lessasym-
metrica1; fusedparamere relativelyshort andnarrow, withtheapicalpart divided
into two fairlynarrowlobeswidelyseparated fromeachother; black tubercleson the
undersideofparamererangedalongthemedianpart ofapicalmargin.
Typeseries. Holotype: Near Bodai,Tanzawa, KanagawaPref., 25-IV-1971,
,
Y. SHIBATA leg.; allotype: ,samelocalityasfortheholotype,4-V-1969, Y.SHIBATA
leg. Paratypes: l Near Ohkura, Tanzawa, Kanagawa Prof., 20L-IV-1969, Y.
,
SHIBATAleg.,1 ,samelocality,27-IV-1974,Y.SHIBATAleg; l Hikawa, 0kutama,
,
Tokyo, 5-V-1968, T. GoHleg ;1 2 Near Kurio, Minamiaiki, NaganoProf.,
, ,
20-IX-l986, S. NlsHIGAKI leg; 1 Near Nidoage, GummaPref., 21-VIII-1960,
,
Y. SHIBATAleg; 1 River Ishikari,1,100malt., Daisetsu Mts., Hokkaido, Japan,
,
22-VIII-1983, N. YAsuDA leg ; 1 Sounkyo, Kamikawa-cho, Hokkaido, Japan,
,
7-V-1981, N. YAsUDAleg.
The hole- and allotypes are deposited in the collection of the Laboratory of
Entomology,TokyoUniversityofAgriculture,andtheparatypesarepreservedinthe
author'sprivatecollection.
lsfrl加tzo/7. Japan(centralHonshu,Hokkaido).
Notes. The present newspeciescanbeeasilydistinguished from theother Jap-
anesespeciesbythehypertrophiedapicalpartofthemedian lobeofmalegenitalia.
要 約
部11,ii・利: 日本産ホソコ力'シラハネカクシ属(Gabrtus)の3新種. - - 1.1?、産ホソコカ'シラノ、ネ
カクシ属の研究は, SHARP(1874,1889),CAMERON(1930),BERNHAUER(1939),TOTTENHAM(1940)お
よびSMETANA(l960,1973, l984) らによって行われ, 現在までに15極が記録されている.そのうち,
7極は前胸背板中央両側の点刻列が6個のもので, 8種は7個のものである.
この属に含まれる種は, いずれも体長10mm以下の小型で, 外見はコカシラハネカクシ(」Phl1o'1-
t/,us)属のものによく 似ているが, 下唇肢第2節は先端に向かって膨らみ, 第3節は細く短いこと,
および雄の前脚付節は拡張しないなどの点で識別できる.
今回, 日本各地からの標本を調べていたところ, 本属のなかでも大型できわめて特徴のある雄交尾
器をもつ3種をみつけることができた. そのうちの1極は, 日本から記録のなかった前1],,1背板の中央
両側に9点刻(8-9個)をもつ極で, 残りの2和 それぞれ7点刻, 6点刻のものである. 精査の結
果いずれも新種と認められたので, 下記のとおり命名記載した.
92 Yasutoshi SHIBATA
オカモトホソコガシラハネカクシGabriusokamoto1は, 前月?背板の点刻列が7個で, 雄交尾器は幅
広く, 側片は先端に向かって拡張するが先端から約1/4のところで鋭くえぐられ, 先端裏面両側の黒
色突起が7-8個であることなどの特徴により他種との識別は容易である.
オオホソコガシラハネカクシ(Jabriusmultipunctatusは, 日本産既知種のなかでは最大で, 前胸背
板の点刻列は9個(8-9個)からなる. 雄交尾器側11-はきわめて小さく, 先端はわずかに二製し, 先
端裏面両側に5個の黒色突起があるなどの点で識別は容易である.
ヤー、トホソコガシラハネカクシGabriusJaponicusは, 前胸背板の点刻列が6個で, 雄交尾器中葉
はいちじるしく細長く左右不対称である点が, 他の日本産の種とはいちじるしく異なり, きわめて容
易に識別することができる.
References
BERNHAUER,M., 1939. ZurStaphylinidenfaunayonChinaundJapan.(10.Beitrag). Ent. Nae/11'.-
bl.,12:97-109.
- - 1939. ZurStaphy、inidenfaunavonChinaunciJapan.(11.Beitrag). Ibid.,12:145-158.
- - & K.SCHUBERT,1914. StaphylinidaelV. 1'1JUNK,W.,&S.SCHENKLING(edS),Co/eOpte「o「urn
Cata/ogus,pars57(pp 289-408). W.Junk,Berlin.
CAMERON,M.,1930. NewspeciesofStaphylinidaefromJapan. Ent.,non.Mag.,67:181-208.
ColFFAIT, H., l974. ColeopteresStaphylinidae dota Region Palearctique Occidentale11. Nouv.
Rev. Ent.,Suppl.,4(4):1-593.
ScHEERPELTz, 0.,1933. StaphylinidaeV11,Supplementuml. /nJUNK,W.,&S.ScHENKLING(eds),
ColeopterorumCata1og,us,pars129(pp 989-1500). W.Junk,Berlin.
SHARP,D.,1874. TheStaphylinidaeofJapan. Trans ent.Soc・. Lo11d.,1874:1-103.
- - 1889. TheStaphylinidaeofJapan. Ann/s.Mag nat. Hist., (III),6:28-44.
SHIBATA, Y.,1983. Provisionalchecklistof thefamilyStaphylinidaeofJapan, III(Insecta:Coleo-
ptera). AnnualBull.NichidaiSanko,(21):67-140. (InJapanese)
SMETA、lA, A., 1960. MonographischeBearbeitungder palaarktischen Arten der GattungGabrius
CURT ausdernlgritulus-Gruppe(Coleoptera). Dtschent.Z.,(N.F),7:295-356.
- - 1973. UebereinigevonDr.M.BERNHAuERbeschriebeneGabi・ius-Arten(Coleoptera,Staphy-
Iinidae). Nouv.Rev.Ent.,3:125-136.
1984. Reviewof theJapanesespeciesof thegenusGabriusSTEPHENS(Coleoptera, Staphy-
- -
1inidae). Pan-Pacif Entomo1.,60:122-l50.
- - 1984. Anewspeciesof thegenusGabriusSTEPHENSfromJapan(Coleoptera,Staphylinidae).
Rev.sulsseZoo/.,91:647-650.
TOTTENHAM, CE.,1940. AnewspeciesofGabriusSTEPHENS(Col.,Staphylinidae)fromJapan. Ent.
mon. Mag.,76:68-69.