Table Of ContentElytra.Tokyo 34(2):275-284.November18.2006
On theKoreanSpeciesof theGenusErichsonlus
(Coleoptera,Staphylinidae)
Yasuaki WATANABE
Laboratoryof Insect Resources,TokyoUniversityof Agriculture,
Atsugi, Kanagawa,243-0034Japan
and
YoungBokOHO
Natural HistoryMuseum,HannanUniversity, Daejeon,305-791 Korea
Abstract The Korean speciesof thestaphylinidgenusErichsonlusare dealt
with.Threenewspeciesaredescribedunder thenamesE. (Sectophi1otlthus)takashii,E.
(S.)wonhyosanusandE. (S.)coreanus,andakeyisgiventothesespecies.Theyare
foundfromunderdeadleavesaccumulatedat thestreamside,withtheexceptionofa
specimenofE. (S )coreanuswhichwastakenbyFIT (Flight InterceptionTrap).
Themembersof thegenusErichsoniusareusually found fromunderdeadleaves
accumulatedatthestreamsideandwidelydistiributedthroughout theworld. 0nlyone
speciesofthisgenushashithertobeenreportedfromKoreabyOHO(1996,p.163)asE.
Japonlcus.Afterthat,thisrecordhasbeen followedbyCHoandAHN(2002,p 66)and
HERMAN(2001,p 2595).Recently,wehadanopportunitytoexamineashortseriesof
interesting specimens of this genus obtained by the second author, Mr. Takashi
WATANABE and othres from several localities of thesouthern part of the Korean
Peninsula and the Island of Jeju-do. As the result of closeexamination, they are
classified intothreespecies, allotwhicharenewtoscienceonaccount of disagreement
in the configuration of themalegenital organ with those of thepreviously known
species.Therefore, wearegoingtodescribethemin thepresentpaper.
Erichsonlus (Sectophiionthus) takashii sp nov.
(Figs.1-4)
Body length: 3.9-4.3mm (from frontmarginof head toanal end); 2.0-2.3mm
(from frontmarginofheadtoelytra1apices).
Body elongate and somewhat depressed above. Colour dark reddish brown to
brownishredandmoderatelyshining, withmouthparts, basal twoantennalsegments,
276 YasuakiWATANABEandYoungBokCH0
.
・
Fig.1. Ertchsonlus (Sectophi1onthus) takashii sp nov., (フ,', from Mt. Haifa-san of Jeju-do, Korea
Scale:1.0mm.
sometimesmarginalareasofpronotum,andlegsbrownishyellowexcept for infuscate
tibiae,elytrayellowishbrown.
Male. Headquadrateandgentlyelevatedmedially,slightlytransverse(width/
length=1.04), postocular part gently arcuate and about 16 times as long as the
longitudinaldiameterofeacheye,whichisslightlyprominentlaterad;surfacesparingly,
coarselyandsetiferouslypuncturedexcept for impunctatemedianpart which is rela-
tivelybroadthroughout itslength,thepuncturesbecomingslightlycloserandsmalleron
thelatero-basa1parts,andcoveredwithextremelyfinecoriaceousgroundsculptureall
over. Antennaeelongate,extendingtothemiddleofpronotumandslightlythickened
towards theapicalsegments, basalsegment polished, 2ndsubopaque, theremainings
opaque,1stsegmentdilatedapicad,about 2.5timesaslongasbroad,2ndconstrictedat
thebase,1.5timesaslongasbroad,considerablyshorter (2nd/1st=0.64) thanthough
asbroadas1st,3rdapparentlylongerthanbroad(length/width=1.74),slightlyshorter
(3rd/2nd=0.89)andsomewhatnarrower (3rd/2nd=0.77) than2nd,4thto9thnearly
equalin lengthtooneanotherthoughincreasingin widthtowardsthe9th,eachslightly
KoreanSpeciesof i''lc1/so川11s 277
Figs 2-4. Malegenital organof rlc/lso川11s (Seclop/ll/o111/1us) takasf111sp nov., 「rom Mt. Halia-san
ofJeju-do, Korea;dorsalview(2).lateralview(3),andventralview(4).Scale:0.5mm.
shorter than3rd(eachof4th to9th/3rd=0.80), 10thaslongasbroad, alittlelonger
(10th/9th=1.16) andbroader (10th/9th=1.23) than9th,11thdistinctly longer than
broad (length/width=1.38), apparently longer (11th/loth=1.49) and somewhat
broader (11th/10th=1.08) than10th, excavatedat theapex.
Pronotumconvexmediallyandsomewhattrapezoidal,narrowedposteriad,alittle
longer thanbroad (length/width=1.04), apparently longer (pronotum/head=1.17)
andsomewhatbroader(pronotum/head=1.17) thanhead,lateralsidesslightlyarcuate
inanterior halvesthoughstraight orslightlyemarginateinposterior halves,anterior
marginarcuate,posteriormarginroundedthoughnearlytruncateatthemiddle,anterior
anglesnarrowlyroundedthoughinvisiblefromabove,posterioranglesbroadlyrounded;
surfaceprovidedwithalongitudinalseriesof5-8strongsetiferouspuncturesoneach
sideofthemiddleandscatteredwithanumber ofsetiferouspuncturesoutsideof the
longitudinalseries, andcoveredwithmicroscopiccoriaceousgroundsculpturewhichis
much finer than on head. Scutellum triangular, surfaceprovided with a few fine
setiferouspuncturesandcoveredwithmoredistinctcoriaceousgroundsculpturethan
that onpronotum.Elytrasubtrapezoida1andslightlydilatedposteriad,slightlylonger
than broad (length/width=1.03), distinctly longer (elytra/pronotum=1.26) and ap-
parentlybroader(elytra/pronotum=1.32) thanpronotum;lateralsidesnearlystraight,
posteriormarginslightlyemarginateat themiddle,posterior anglesrounded;surface
somewhatsparinglycoveredwithcoarsepuncturesandfinebrownishpubescence. Legs
moderately long,basal fourprotarsa1segmentsmoreor lesswidened.
278 YasuakiWATANABEandYoungBokCHo
Abdomen gradually narrowed towards the anal end, 3rd to 5th tergites each
shallowlyandtransverselydepressedalongthebase,3rdto6thtergiteseachmoreclosely
andmuchmorefinelypuncturedthanonelytraanddenselycoveredwithbrownish
pubescence,6thand7thtergiteseachmoresparinglypuncturedandpubescent thanin
theprecedingtergites;8thsterniteprovidedwithasmallemarginationat themiddleof
posteriormargin.
Genitalorgantrilobedandsymmetrical.Medianlobenearlyparallel-sidedexcept
for apical part whichis abruptlynarrowedandproducedintoabill,dorsal surface
smooth,ventralsurfacedistinctlyemarginateat themiddleinapicalthird.Parameres
somewhatstout,slightlylongerthanmedianlobe,eachmoreorlessdilatedinapicalpart
whichis membraneous.
Fema le. Similarinfaciestomale,buttheistto4thprotarsa1segmentsareless
widenedandthe8thabdominalsterniteissimply roundedat themiddleofposterior
margin.
Typeseries. Holotype: , allotype:早,Seongpanak, Mt. Ha11asan, EJeju-do,
Korea, 27-V-2003, T. WATANABEleg. Paratypes: 2 , 3早早,samedata as for the
holotype; l Korea,Jeju-do,nearGoepyeongioreum,Gyorae-ri,Jocheon-eup,Bukjeju-
,
gun, 30-V~17-VI-2003, Y-B. CHo leg; 5 ,5早早, Korea,JejuProv.,Bukjeju-gun,
Jocheoneup,Seongpanak,27-VI-2003,M-J.JEoNleg; l 1早,Korea,JeonnamProv.,
,
Boseong-gun,Bokrae-myeon,Mt.Dubong-san, N34.92509,E l27.09701,30-VII-2003,
S-J.PARK&D-H. LEEleg. Thetypespecimensaredepositedinthecollectionof the
Natural HistoryMuseum,HannanUniversity,Daejeon, Korea,except forsomepara-
typesthatarepreservedinthecollectionoftheLaboratoryofInsectResources,Tokyo
UniversityofAgricultureandTakashiWATANABE'sprivatecollection.
fstrlbutfon. Korea.
Remarks. Thepresent newspecies issomewhatsimilar inconfigurationofmale
genitalorgantothatofE. ItelUHLIGetY.WATANABE(1992,p 39) fromJapan, but
iseasilydistinguishablefromitbythefollowingpoints:bodylarger;headandpronotum
coveredwithmuchfinercoriaceousgroundsculpture,elytramuchmoresparinglyand
more coarsely punctured and median lobe of male genital organ more narrowly
prolongedat theapex.
Bionomics. Anumber of typespecimenswerefound fromdeadleavesaccumu-
latedat thestreamsideinadeciduousbroadleavedforestonMt. Hallasanat an altitude
of800m. AparatypefromBukjeju-gunwasobtainedbyFIT.
Etymology. The specific epithet of the present new species isgiven after Mr.
TakashiWATANABE,whocollected theholotype.
Eriahsonius(Sectophi1onthus)wonhyosanussp
n ov
(Figs 5-10)
Body length: 4.0-4.3mm (from front margin of head to analend); 1.9-2.0mm
(fromfrontmarginofhead toelytralapices).
KoreanSpeciesofErichsonlus. 279
Figs 5-7. Male genital organ o「Ericfisc川11s (Sectophi1ont1/ils) 、votlhyosantls sp nov., from Mt
Wonhyo-sanofGyeongnam Prov.,Korea:dorsalview (5),lateralview (6),andventralview (7)
Scale:0.5mm.
Bodyelongate, somewhat depressed aboveandsubparale11-sided. Colour reddish
brown andmoderatelyshining, withmouth parts, coxae and femora reddish yellow,
elytraandposterior marginsof abdominalsegmentspaler.
M aleand fem a1e. Closely resemblestheprecedingspecies inbodysizeand
general appearance,but different fromit inthe followingpoints:
Headquadrate,slightlymore transverse (width/length=1.09), postocular part
almoststraight and15 timesaslongasthelongitudinal diameterofeacheye;surface
coveredwithsimilarpuncturesandmicroscopiccoriaceousgroundsculptureasinthe
precedingspecies.Antennaeelongatethoughslightlylessthickenedtowardstheapical
segment, 6th to9thalmost equal inlength tooneanother,eachaslongasbroad, loth
somewhat transverse(width/length=1.17),11thsimilarinconfigurationtothatofthe
precedingspecies. Pronotum relatively longascompared with that of thepreceding
speciesandalittlelonger thanbroad (length/width=1.17),distinctly longer (prono-
tum/head=1.27) thanthoughasbroadashead;surfacesimilarlypuncturedasinthe
precedingspeciesthoughcoveredwithmoredistinctcoriaceousgroundsclupturethan
that oftheprecedingspecies. Elytrasimilar inconfiguration to thoseof thepreceding
species, slightly longer than broad (length/width=1.03), apparently longer (elytra/
pronotum=1.18) anddistinctlybroader (elytra/pronotum=1.33) thanpronotum;sur-
facecoveredwithcloserandmoresuperficialpunctures.
Abdomenlesscloselyandsomewhatmorecoarselypuncturedthaninthepreceding
280 YasuakiWATANABEandYoungBokCH0
10
Figs 8-10. Malegenital organofEric11sonl1ls (Sectop1liionthus)H,onhyosanussp nov., from Nami
Natural Recreation Forest, Chungnam Prov., Korea; dorsal view (8), lateral view (9), and
ventralview (10).Scale:0.5mm.
species;8thsterniteinmalesubtriangularlyexcisedbut infemaleroundedatthemiddle
ofposteriormargin.
Malegenital organ trilobed andsymmetrical as that of the preceding species;
median lobeparallel-sided though slightlyconstrictedat themiddle, dorsal surface
membraneousinapicalthirdandprovidedwithahorn-likeprojectionateachsideofthe
middlebeforeapicalmargin which isalmost straight; paramereselongateanda little
longerthanmedianlobe,eachsomewhatwidenedinapicalpart whichismembraneous
asin theprecedingspecies.
Typeseries. Holotype: ,allotype:早, Korea,GyeongnamProv., Yangsan-shi,
Daeseok-ri,Gajisan-Prov.Park, Mt.Wonhyosan, 9-VII-2002,Y-B. CHo leg.
ThetypespecimensarepreservedinthecollectionoftheNaturalHistoryMuseum,
HannanUniversity, Daejeon, Korea.
Furtherspecimenexamined. 1 Korea,ChungnamProv.,Geoncheon-ri, Nami-
,
myeon,Geumsan-gun, Nami NaturalRecreationForest,4-VIII-2004,Y-B. CHo leg.
The specimen obtained in the Nami Natural Recreation Forest is somewhat
different fromtheholotypeinthelengthofthemedianlobeofmalegenitalorgan. Itis
prolonged posteriad in the apical membraneouspart, and is distinctly longer than
parameres. However, thedifferencecanberegardedasaninfraspecificvariation.
KoreanSpeciesof i・,ic1/sonllls 281
istributlon. Korea.
Bionomics. Thebolo-andallotypeswereobtainedbysiftingdeadleavesaccumu-
lated inadeciduousbroadleaved forest onMt.Wonhyo-san.
Etymology. ThespecificepithetofthisnewspeciesisderivedfromMt.Wonhyo-
san,thetypelocality.
Erichsonius (Sectophiionthus)coreanussp nov
(Figs.1l-13)
irlc/1s0川usJape川offs:OHO,1996,KoreanJ.Z001..39163 [neeCAMERON, l933]. - CH0& AHN,2001,
InsectaKoreanaSuppl.,18:66[neeCAMERo1、l 1933]. - HERMAN, 2001,Bull. Amer.Mus nat.
Hist., (265):2595 [neeCAMERON,1933].
Body length:3.5-3.8mm(from frontmarginofhead toanalend); 1.8-1.9mm
(fromfrontmarginofhead toelytra1apices).
Bodyelongate,andsubpara11e1-sided. Colourblackishbrowntoreddishbrownand
moderatelyshining,withmouthpartsandlegsyellow,thoughthelatterismoreorless
infuscated in tibiae, antennaeexcept for yellowishbasal twosegments,suturaland
posterior marginal areasofelytraandposterior marginofeachabdominal segment
yellowishbrown.
Similaringeneralappearancetothetwoprecedingspecies,but readilydistinguish-
ablefromthembythebodysmallerandtheelytracoveredwithmuchcloserandmuch
finerpunctures.
M ale. Head subquadrate and somewhat convex, almost as long as broad,
postocularpartnearlystraightandabout14timesaslongasthelongitudinaldiameter
of eacheyewhich isslightlyprominent laterally; surfaceverysparsely, coarsely and
setiferously puncturedexcept for theimpunctatemedian longitudinalpart, thepunc-
turesbecomingmoreor lesscloserandsmaller inthelatero-posteriorpartsthaninthe
otherparts,andcoveredwithextremelyfinecoriaceousgroundsclupturevisibleunder
highmagnification. Antennaeelongate,extendingtoabout anterior thirdofpronotum
andslightlythickenedtowardstheapicalsegment,basalsegmentpolished,2ndand3rd
subopaque,andtheremainingsopaque,1stdilatedapicadandremarkablylongerthan
broad(length/width=2.33),2ndconstrictedatthebase,apparentlylonger thanbroad
(length/width=1.33) but distinctlyshorter (2nd/1st=0.57) than thoughalmost as
broadas1st,3rdelongateandabout twiceaslongasbroad,nearlyaslongasthough
apparentlynarrower(3rd/2nd=0.67) than2nd,4th1.5timesaslongasbroad, though
slightlyshorter(4th/3rd=0.75)andnearlyasbroadas3rd,5thto10thalmostequalin
length tooneanother andgradually increasinginwidth towardsthe10th,5thto7th
eachslightly longer thanbroad,8thaslongasbroad,slightlybroader than7th (8th/
7th=1.09),9th (width/length=1.20) and10th(width/length=1.28)eachtransverse,
11thtwiceaslongasandapparentlybroader (11th/10th=1.25) than10th,excavatedat
theapex.
282 YasuakiWATANABEandYoungBokCHo
11 13
Figs.11-13. MalegenitalorganofEric/1sonlils(Sectophl1o,1tlnis)co,・eanussp nov., fromAndongof
GyeongbukProv., Korea;dorsal view (11). lateralvie、、(l2),andventralview (13).Scale: 0.5
mm.
Pronotum convexmedially andparallel-sided, considerably longer than broad
(length/width=1.21),distinctlylonger(pronotum/head=1.32)andsomewhatbroader
(pronotum/head=1.10) thanhead; lateral sidesfinely bordered,slightly arcuate in
anterior halvesandsomewhat emarginate inposterior halves, anterior margin feebly
arcuate though truncate at the middle, posterior margin rounded, anterior angles
narrowlyangulatethoughnotvisiblefromdorsalside,posterioranglesrounded;surface
morenumerouslyandmorecoarselypuncturedthanonheadexcept for arelatively
broad smoothmedianspace, andcoveredall over withsimilar microscopic ground
sclupture to that on head. Scutellum triangular, surface provided withsparse fine
setiferouspuncturesandcoveredwithmoredistinctcoriaceousgroundsculpturethan
onpronotum. Elytrasubtrapezoida1andsomewhat dilatedposteriad,slightly longer
thanbroad (length/width=1.03),distinctly longer (elytra/pronotum=1.10) andap-
parentlybroader(elytra/pronotum=1.29)thanpronotum;lateralsidesslightlyarcuate,
posteriormarginsomewhatemarginateatthemiddle,posterioranglesrounded;surface
densely, finely,superficiallypuncturedand closelycoveredwithfinebrownishpubes-
cence. Legsmoderatelylongandrelativelyslender,protarsislightlywidened.
Abdomen gradually narrowed towards the anal end, 3rd to5th tergiteseach
shallowlyandtransverselydepressedalongthebase,3rdto5thtergiteseachlessdensely
andlesscoarselypuncturedthaninelytraandcoveredwithlongerandcoarserbrownish
pubescencethanthatofelytra;8thtergitemuchmoresparinglypuncturedandpubes-
centthanintheprecedingtergites;8thsterniteshallowlyandsemicircularlyemarginate
atthemiddleofposteriormargin.
Genitalorgantrilobedandsymmetricalasthatofthetwoprecedingspecies;median
lobesomewhat constrictedinbasal thirdthoughclearly dilated tobeforetheapical
constriction,apicalpartproducedintoatongue;paramereselongateandalmostaslong
KoreanSpecieso「Eric1/so1litls 283
asmedianlobe,eachsomewhatexpandedintoasubtriangularpartbeforetheapex,the
expanseprovidedwith four finesetae.
Fem ale. Similarin faciestomale,thoughtheistto4thprotarsa1segmentsare
notsoclearlywidenedandtheabdomenwiththe8thsterniteroundedat themiddleof
posteriormargin.
Typeseries. Holotype: ,allotype:早,Korea,GyeongbukProv.,Nokjeon-myeon,
Andong,10-VIII-1986,K-S.LEEleg.Paratype:1早,samedataasfortheholotype;101',
GyeongnamProv.,Sanam-myeon,Sacheon-shi,20-VI-1986,K-S. LEEleg;1早,Korea,
ChungbukProv., Naesu-myeon, Cheongwon-gun, 25-V-1986, K-S. LEEleg; l Ko-
,
rea,Jeju-do,Mt.Dongsuak,Namwon-eup,Namjeju-gun,30-VIII-1997,Y-B. CHoleg;
l 1早,Seongpanak,Mt.Haifa-san,EJeju-do,Korea,27-V-2003,T.WATANABEleg;
,
1早, Korea,JejuProv.,Bukjeju-gunJocheoneug,Seongpanak,27-VI-2003,M-J.JEoN
leg. ThetypespecimensarepreservedinthecollectionoftheNaturalHistoryMuseum,
HannamUniversity,Daejeon,except for3paratypes(l ,2早早)whicharedepositedin
thecollectionoftheLaboratoryofInsectResources, TokyoUniversityofAgriculture.
Distribution. Korea.
Remarks. Thepresentnewspecieshasbeenreported from KoreabyCHo(1996,
p.163)andCHoandAHN(2001,p 66)undermisidentification. Themalegenitalorgan
ofthisspeciesisclearlydifferentinconfigurationoffusedparamerefromthepreviously
knownspecies.
Bionomics. Oneparatype(早) fromJeju-dowasobtainedtogetherwithE takashii
fromunder deadleavesaccumulated at thestreamsideonMt. Haifa-san at an altitude
of 800m.
KeytotheKoreanSpeciesofErichsonius
AlltheKoreanspeciesofErichsonlusbelongtothesubgenusSectophi1onthus.
Head quadrate and slightly transverse, elytrasomewhat sparingly and coarsely
punctured 2
2 Malegenitalorganwithmedianlobeproducedintoabillat themiddleofapical
marginandwithout horn-likeprojectionateachsideof themiddlebeforethe
apicalmargin E takashiisp nov
2 Malegenitalorganwithmedianlobealmosttruncateat theapexandprovidedwith
ahorn-likeprojectionat eachsideofthemiddlebeforeapicalmargin_____.
E.wonhyosanussp
n ov
Headoblongandslightlylonger thanbroad,elytradenselyandfinelypunctured
E.coreanussp
n ov
Acknowledgments
Wewould like to express our hearty thanks to Dr. Shun-Ichi UtNo, Visiting
ProfessoratTokyoUniversityofAgriculture, forhiskindadviceonthepresentstudy.
284 YasuakiWATANABEandYoungBokCHo
Our cordial thanksarealsoduetoMissM-J.JEoN,Mr. D-H. LEE,Dept. Biology,
Chungnam National University, Mr. K-S. LEE, China at present, and Mr. Takashi
WATANABE, Fujisawa, Japan, for their kindness inprovidinguswith the invaluable
specimensused in thisstudy and to Mr. Junnosuke KANToH, Laboratory of Insect
Resources,TokyoUniversityofAgriculture, for takingthephotographinserted in this
paper.
要 約
渡辺泰明・, 71(福: 韓国産ヒメホソハネカクシ属について. 一 これまで韓国からは, ヒメ
ホソハネカクシ属に含まれる種として, ツヤヒメホソハネカクシただ1種が報告されているに過
ぎなかった. 最近, 筆者らは, この個体を含め韓国内で採集された, この属に含まれる一連の個
体を検討する機会を得た. この結果, 2極を未記1成種と認めたので, これらをErichson,us(Secto-
ph11onthus)takashii, およびE. (S.)、vo,1hyosanusとそれそれ命名・記載した. また, 先にッヤヒメ
ホソハネカクシとして報告された個体は, ツヤヒメホノハネカクシとは雄交尾器の形状が明らか
に異なり, この種も未記載種と判定されたので, Erichsonl1ls(Sectophi1onthus)coreanusと命名・記
破した.
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