A New Species of the Group of Lathrobium monticola (Coleoptera, Staphylinidae) from South Korea

4 Pages·2000·4.2 MB·English

by  Watanabe, Y

Elytra,Tokyo,28(2):323-326,Novemberl5,2000
ANewSpeciesoftheGroupofLathrobiummonticola
(Coleoptera,Staphylinidae) fromSouthKorea
YasuakiWATANABE
LaboratoryofInsectResources,TokyoUniversityofAgriculture,
Atsugi,Kanagawa,243-0034Japan
Abstract Anewspecie・softhegroupofLat/11・obium,nontlcolaisdescribedunder
thenameofL(s.str)col,eanum.ItisfoundbyusingBerlese'sapparatusfromdeadleaves
or the litteraccumulatedinadeciduousbroadleaved foreston Mt.NajangsanofJeonla-
buk-doProvinceinSouthKorea.
AsregardsapterousLathrobium,onlyonespecies,Lathrobiumpo11ens,hashith-
ertobeenreported fromKoreabyPAIK(1985,p i t, fig 9). Throughthecourtesyof
Dr.HidetoHosHINA,IhaverecentlyhadanopportunitytoexamineanapterousLath-
robiumobtainedonMt.NajangsaninJeonlabuk-doProvince,Korea. Itseemstobe-
longtothegroupofL.(s.str)montlcolaSHARP(1889,p 255),whichcanbedistin-
guished fromthatofL.(s.str)pollensbysmallbodyandinconspicuoussecondary
sexualcharacter oftheabdomenin themale. Afteracarefulexamination, it hasbe-
comeclearthatthisspeciesisnewtoscienceforreasonofdisagreementwithLmon-
tlcolainconfigurationofthemalegenital organ. Itwillbedescribed inthepresent
paper.
Beforegoingfurther,IwishtoexpressmyheartythankstoDr.Shun-IchiUENo,
visitingProfessoratTokyoUniversityofAgriculture,forhiskindadviceonthePres-
entstudy.DeepgratitudeisalsoduetoDr.H.HosHINA, InstituteofEnvironmental
scjenceandTechnology,YokohamaNationalUniversity,forhiskindnessinsubmitting
jnvaluablespecimenstomefortaxonomicstudy.
Lathrobium(s.str)coreanumY.WATANABE,SP nov.
(Figs.1-4)
Bodylength:6.9_7.2mm(fromfrontmarginofheadtoanalend);3・0-3・1mm
(fromfrontmarginofheadtoelytra1apices).
Bodyelongate,paralle_lsidedandsomewhatdepressedabove.Co1ou「b「oWnSih
blackandmoderatelyshining,withsutureandapicalmarginreddishb「own,mandibles
andantennaeyellowishred,legsbrownishyellow.
Headsubquadrateandweaklyconvexmedially,almostaston9asb「cad,
Male
324 YasuakiWATANABE
widestbeforeposterioranglesanddistinctlynarrowedanteriad;lateralsidesgentlyar-
cuate, frontalpartbetweenantennaltuberclestransversely attenedandglabrous,pro-
videdwithalargesetiferouspunctureinsideeachantennaltubercle;surfacesparingly,
coarselyandsetiferouslypuncture thepuncturesbecomingcloserandsmalleronthe
1atero-basa1parts;eyessmalland flat, their longitudinaldiameter apparentlyshorter
thanpostocular part (longitudinaldiameter ofeye/postocular part=0.42). Antennae
elongate,extendingtothemiddleofpronotumandnotthickenedtowardsapicalseg-
ment,twoproximalsegmentspolished,theremainingsopaque,1stsegmentrobustand
stronglywidenedapicad,morethantwiceaslongasbroa 2ndto11thequal inwidth
tooneanother,2ndconstrictedatthebase,1.5timesaslongasbroadthoughahalfas
longasanddistinctly narrower than1st(2nd/1st=0.73),3rdelongatethoughsome-
whatdilatedapicad,1.5timesaslongasbroadandalmostaslongas2n 4th and 5th
equal inlengthtoeachother,eachalittlelongerthanbroad(length/width=1.25)but
somewhatshorter than3rd(4thor 5th/3rd=0.83), 6thto10thmoreor lessmonili-
form,equal inlengthtooneanother,eachslightly longer thanbroad(length/width=
1.13)butsomewhatshorter(eachof6thto10th/5th=0.90) than5th,11th fusiform,
apparently longer thanbroad (length/width=1.75) andabout 15 times as long as
10th,subacuminateatthetip.
Pronotumoblongthoughsomewhatnarrowedposteria alittlelongerthanbroad
(length/width=1.24),distinctlylonger(pronotum/head=1.35)andsomewhatbroader
(pronotum/head=1.09)thanhead;lateralsidesslightlyarcuateindorsalview,anterior
margingentlyrounded,posteriormarginsubtruncatebut feeblyemarginateatthemid_
die,anterioranglesobtuseandnotvisiblefromdorsalside,posterioronesnarrowly
rounded;surfacemorecloselyandmorecoarselypuncturedthanonboa except fora
narrowsmoothmedianspacethroughthelengthofpronotum.Scutellumsubtriangular
andsmall,Providedwithseveralminutesetiferouspuncturesonthesurface.Elytra
SubtraPezoida1,somewhatdilatedposteria transverse(width/length=1.11),distinctly
She「te「(elytra/pronotum=0.78) butslightlybroader (elytra/pronotum=1.08) than
P「onOtum;lateralsidesnearlystraight,posteriormarginemarginateatthemjddle,pos_
te「Oi 「anglesbroadlyrounded;surfaceratherdenselycoveredwithsuperfjcja1setjfer_
Fi9・1・ Lath'obiit'n(S・St「.)Co'e'a'u″nY.WATANABE,spnov;lastthreeabdomjna1 slernjlesjnthemale
Scale:1.0mm.
NewKoreanSpeciesoftheGroupofLat1/,・obiit,n,110,1tlcola 325
Figs. 2-4. MalegenitalorganofLath1・chiff,n(s.str)co''ea'tumY.WATANABE,sp nov;dorsalview(2),
lateralview(3),andventralview(4).Scale:1.0mm.
ouspunctures.Legsrelativelyshort;profemurandprotibiaesimilarinstructuretothat
of L montlcola;1stto4thprotarsa1segmentsstronglywidened,lastsegmentslightly
shorterthanalltheprecedingstogether.
Abdomenelongate,parallel-sided,thoughabruptlynarrowed from8thsegmentto
apicalend;3rdto7thtergiteseachshallowlyandtransverselydepressedalongthebase
andsomewhatsparingly, finely andaciculately punctured,7thand8thtergiteseach
moresparinglyandmorefinelypuncturedthanintheprecedingtergites;allthetergites
coveredwithfinebrownishpubescence;8thsternitewithposteriormarginonlygently
rounded.
Genital organ longelliptical, wellsclerotizedexcept for membraneous ventral
sideofmedianlobe. Medianlobeslightlyshorter than fusedparamere,widestatthe
middleandmorestronglynarrowedapicadthanbasad;ventralsclerotizedpiecesub-
rhomboidal,widestnear themiddleandremarkablynarrowedbothbasadandapicad
thoughnearlyparallel-sidedinposterior thir apexobtuselypointedinventral view
thoughbrieflycurvedventradand formingasmall hookasseen fromlateralside.
Fusedparamererelativelybroadandslightlyasymmetrical;vieweddorsally,widestat
basal fourthandthengraduallynarrowedbothbasadandapicadthoughstronglysoin
apicalpartwhichisslightlyinclinedtotheleftsideandacutelypointedatthetip,sur-
facefinelyandlongitudinallycarinatealongthemedianline, thecarinaabbreviated
nearapicalthird.
Female. Similar tomaleingeneralappearanceaswellas inconfigurationof
8th abdominal sternite, but the ist to4thprotarsa1segments arenot so strongly
widened.
Typeseries. Holotype: , allotype: Korea,Jeonlabuk-doProv.,JeongebCity,
,
Mt.NaeJangsan,NaejangsaTemple,GeumseonValley,24~25-VI-2000,H.HOSHINA
& M.MARUYAMAleg.Paratypes:3 2 ,samedataas for theholotype.The type
,
326 Yasuaki WATANABE
specimens are deposited in the Department of Biology, Natural ScienceCollege,
ChungnamNationalUniversity,Taejon,Korea,except for threeparatypes(2 , 1e)
which arepreserved in thecollection oftheLaboratory of Insect Resources, Tokyo
UniversityofAgriculture.
Remarks. Thepresent newspeciesissimilar inbodysizeand facies toL. (s.
str)monticola fromJapan,butisdifferent fromitinthefollowingpoints:headaslong
asbroadandmoredistinctly narrowedanteriaci,elytralesstransverse,surfacemore
denselyandmorecoarselypunctured;8thabdominalsterniteinmalemoredistinctly
roundedintheapicalmargin;medianlobeofmalegenitalorganslightlyshorterthan
fusedparamere,sclerotizedventralpiecenearlyparallel-sidedinposterior thir fused
paramererelativelybroadandabruptlycurveddorsadinapical fourthasseen fromlat-
eralside.
Bionomics. The type specimens were found in dead leaves in a deciduous
broadleaved forestintheGeumseonValleyonMt.Naejangsan.
Etymology. ThespecificepithetofthepresentnewspecieisderivedfromKorea
inwhichliesthetypelocality“Mt.Naejangsan”.
要 約
渡辺泰明:韓国全羅北道から採集されたチビコバネナガハネカクシに近緑の1新種. - 韓
国からはこれまでに, ナガハネカクシ属に含まれる後翅の退化した種として, コバネナガハネ
カクシただ1種が記録されているに過ぎなかった. 本年6月下旬, 保科英人博士および丸山宗
利氏によって, この種群に含まれる1種が全羅北道井邑市の内粧山で採集された. 保科博士の
ご厚意でこの種を検討した結果, 体長および雄の腹部の第二次性徴が不明瞭な点で, チビコバ
ネナガハネカクシに近縁の種と判断された. しかしながら,頭部は長さと幅が等しく, 前方に
より明瞭に狭まること, 翅鞘はより密に, より粗く点刻されること, さらに雄交尾器の形状に
も差異が認められたので新種と判定し, L.(s.str)co,・eanun,と命名・記載した.
References
PAIK, W., 1985. StudyonStaphylinidae(Coleoptera)ofKorea. SanhakHyotlpdo11g, Seotl1,1985(9)
1-37.RuralDevelopmentAdministration.(InKorean,withEnglishsummary)
SHARP,D.,1889. TheStaphylinidaeofJapan. Ann.Mag nat.Hist.,(6),3:249-267[part6].