Two New Calocarabus (Coleoptera, Carabidae) from the Alpine Region of Southern Gansu, China

2005·3.2 MB·

by  Imura, Y

Elytra,「okyo,33(1):371-375,May30,2005
TwoNewCa1ocarabus(Coleoptera,Carabidae) from
theAlpineRegionofSouthernGansu,China
Yuki IMURA
Shinohara-chol249-8,Kohoku-ku,Yokohama,222-0026Japan
Abstract Two new speciesof thegenusCa1oca1abusaredescribed from the
alpineregionofsouthernGansu.China,underthenamesCse1nentlvllsandC,1evestt,nus.
ThegenusCa1ocarab11s(subtribeCarabinaofthetribeCarabini)comprisesover
10species,allhavingrelativelysmallbody,hypertrophicheadandoftenmetallically
colored dorsal surface. Theyare foundonthehighmountains intheinlandareaof
China,mainly fromnorthwesternSichuantosouthernGansuandsoutheasternQing-
hai.Throughthecourtesyoftwoskillfulcarabido1ogists,Messrs. IgorBELousovand
IlyaKABAK, I recentlyhadanopportunitytoexamineaseriesofcarabidspecimens
collectedfromthealpineregionofsouthernGansu,andfoundtwoundescribedspecies
belonging to theabovegenus. In thisarticle, Iwill describethemunderthenamesof
Ca1ocarabussementivusand C nevestimus.
For theapplicationofthegeneric namesof thesubtribeCarabina, I follow the
highersystemproposedby IMuRA (2002), andtheabbreviationsusedarethesameas
thoseexplainedinpreviouspapersofmine.
I thank Messrs. Igor BELoUsov (St.Petersburg, Russia), IlyaKABAK(Almaty,
Kazakhstan)andBoleslavBREzlNA(Prague,CzechRepublic) fortheirkindsupportof
thepresentstudy. ThanksarealsoduetoDr.Shun-IchiUENo(NationalScienceMu-
seum,Tokyo) forreadingthemanuscriptofthispaper.
1.CalocalabussenlentivusIMURA,sp nov.
(Figs.1,3,4)
Desc,・1ptjon. Length: 15.0mm(includingmandibles).Uppersurfaceof body
reddishcoppery,bearingyellow-greenishtingeonmarginalareasofhea Pronotum,
elytra,aswellasonbottomsoffrontal furrows,depressedpartsofPronotumandP「i-
foveoles of elytra. Appendagesblack, though basal parts of antennae and
mary
mandiblesarered-brownish.
Headhypertrophicasintheothermembersofthesamegenus,moredistinctlySo
jn female,withrelativelysmalleyesandratherstraightlyprotrudedmandibles; frons
sporadjca1lyscatteredwithshallowpunctures; frontal furrowswideanddeeplyCOn-
372 Yuki lMURA
cave,withsurfaceirregularlyscabrousbehindthelevelof fronto-clypealsuture;vertex
toneckirregularlyrugose-striateandnotpunctate,withapairofdepressionsoneach
sideataboutthemid-eyelevel;retinaculumofrightmandiblebidentate,withtheante-
riortooththickerandlargerthantheposterior;terminalsegmentsofpalpialittleme「e
widelydilatedinmalethaninfemale;penultimatesegmentoflabialPalpusbisetose;
medjantoothofmentummuchshorter thanlateral lobes,withapexsharplypointed;
submentumasetose;antennaeshort,notreachingthebasalthirdofelytrainmale.
Pronotumtransversecordate,muchwiderthanlongandwidestneartheapical
third;PW/HW138,PW/Pi t67,PW/PAW134,PW/PBW152,PBW/PAW0.89;
apicalmargindeeplyemarginate, frontanglesobtuselyroundedandnotprotrudedan-
teriad;lateralsidesdistinctlymarginedthroughout,gentlyroundedin frontandfeebly
sinuate towards hind angles which are subtriangularly produced posteriad with
rounded tips; discweaklyconvexabove,withsurfaceweakly tostrongly
rugose-
scabrous;basal foveaeratherdeeplyconcaveandmedianlongitudinal lineclearly im-
pressedthroughout; threetosixmarginal setaeinsertedoneithersideofpronotum,
twotofiveonanteriorandmedianportionsandonebeforehindangle.
Elytraoblong-ovate, widestalittlebehindthemiddle,andmoregradually nar-
rowedtowardsbasesthantowardsapices;EW/PW1.39,EL/EW1.51;shouldersrather
distinct,lateralsidesgentlyarcuatethroughout,withmarginsnarrowlyre exedabove;
sculpture triploid heterodyname - primaries the widest, irregularly segmented by
large,shallowprimaryfoveolestoformrowsofmoderatelyraisedcostaeorcallosities;
secondariesmuchnarrowerthanprimariesandlongitudinallycontiguousthoughpartly
andirregularlyinterruptedbysmall foveoles;tertiariestheweakest,indicatedbyirreg-
ularlysetrowsofgranuleswhichpartlybecomeunclear;umbilicateseriesindicatedby
irregularlyandsporadicallysetrowsofsmallgranules.
Episternaandsidesofsternitesalmostsmooth,sternalsulciunrecognized;mota-
coxatrisetose;basal foursegmentsofmaleforetarsusdilatedwithhairpadsonventral
surface,thoughthefourthoneismuchsmallerthantheotherthree.
Malegenitaliaasshown inFig 4; aedeagusslender,moderately arcuate, and
graduallynarrowedapicadfromthemiddle,withbasalpartratherabruptlycurvedven-
trad;medianportionsubcylindrica1andrathershort,almostparallel-sided in lateral
view,andwidestalittlebeforethemiddle;apicallobeshortandrobust,1.15timesas
Ion9aswide,subtriangularlyshape withalmoststraightventralmarginandgently
「oundeddorsalmargininlateralview,weaklyhookedandcompressedrightlateradjn
do「SalView,andbluntattip;0Lsmall,weaklyprotrudeddorsad,andfaintlybilobedat
tip;endOphalluswithligulumindicatedby1ogitudinalIysetrowsofgranulestoforma
na「「oWandShortrid9e;neitherBLnorMLdeveloped;PREsymmetricallyin
ate not
bi1obe andhairlyonsurface;PARhemispherical,moderateinsize,andsymmetrj_
CallyP「otrudedonbothsides;PPalsomoderatelysizedandsymmetrical;ALhardly
in ated;PLlarge,stronglyprotrudedventra adheredatcentreto formalargesjngle
inflationWiththetipslightlybilobed;AGGwithapairofshorttermjna1plateswjthout
sclerotizationandpigmentation.
TwoNewAlpineCa1oca,abusfromSouthernGansu 373
Figs.1-3. Ca1oca,・abusspp fromGuazigouinsouthernGansu. - 1,Cso,nentivus( , holotype);
2,Cnevestinlus( holotype);3,C.sement1、,us?( ).
,
N8 ' Holotype: ,ca.10kmsoutheastofGuazigou[瓜子、曽 (3°31 '5″5一3°319 4″0
104°45'32″E),3,450-3,595minaltitude,inthesoutheasternpartofZhugquXian[舟
曲 ] near thebordersofWudu Xian [武都 ]andWon Xian [文 ], ofsouthern
Gansu,China,17-VII-2004,preservedinthecollectionoftheDepartmentofZoology,
NationalScienceMuseum(Nat.Hist),Tokyo(=NSMT).
Furtherspecimene)camined. 1 (16.4mminlength),samedataasfortheholo-
typeofC.sementivus,preservedinthecollectionofY.IMURA.
This female(Fig 3)wascollected togetherwiththeholotypeofC sementivus
andbearsthe features almostconsistent with thesamespecies.However, itshows
character states intermediatebetween thoseof C sementivusand of the other new
speciestobedescribedinthefollowingsection, forexample,incolorationofthedor-
salsurface,shapeofthepronotumandsculpturalconditionoftheelytra.Therefore,it
isnotdesignatedasaparatypeofthenewspeciesandthefinalconclusionwillbesus-
pendedonitstaxonomicaccountuntilwecanexamineenoughspecimenstoknowthe
rangeofindividualvariationofeachspecies.
ThepresentnewspeciesismostcloselyalliedtoCa1ocalabustrichotho-
Notes.
rax(BREzlNA&IMURA,1997,p 8, figs4,8-l2),butreadilydiscriminated fromthat
374 YL1kiIMUIu
raceinhavingmuchsmallersize,differentcolorationof thedorsalsurface,smaller
numberofmarginalsetaeof thepronotum,differentlysculpturedelytra1disc,differ-
entlyshapedaedeagusandendopha11us.Thenewspecieswascollectedtogetherwith
thefollowingtwoCarabina: psoca,-a加smi/(hazflandPseudoc''anion enJamfnl.
Etymology. Thenameofthenewspecies,meaning“seed-like” inLatin,isde-
rived from both its locality and the impression carried away from this beetle:
Guazigou, thetypelocalityofthenewspecies,meanstheValleyofMelonSeed in
Chinese,andthegeneralappearanceofthissmallCa1oca1・abusremindsusoftheseed
ofcertainplantssuchassquash,sunflowerorwatermelon.
2.CalocarabusnevestimusIMURA,sp nov
(Figs2,5)
Des〔;ription. Length:15.6mm(includingmandibles).VerycloselyalliedtoC.
sementivusdescribedintheprecedinglines,butdiscriminated from itasfollows: 1)
sizealittlelarger;2)dorsalsurfacemorestronglypolished,withcolorationnotreddish
butcopperybrownish;3) centralportionofvertexhardly rugu1oseandsporadically
scatteredwithsmallpunctures;4)depressionsoneachsideofvertexshallower;5)me-
diantoothofmentumobtuselyroundedattip;6)pronotumalittlenarrower,1.53times
aslongaswideinmale,withfrontanglesobviouslyprotrudedanteria hindanglesa
Fi9S. 4-5. MalegenitalorganofCa1oca1-abusspp. - 4, C so,nentlvils; 5, C ,7evest1,mls. _ a,
Aedeaguswithfullyevertedendopha1lusinrightlateralview;b,apicalpartofaedeagusjnthesame
view;c,dittoindorsalview.Scale:2mmfora:1mmforb &c.
TwoNewAlpineCa1oca,abtlsfromSouthernGansu 375
littlenarrower,andcentralportionofdiscsmootherandmorestronglypolished; 7)
number ofpronota1setae four to fiveoneachside; 7)elytrawithshouldersalittle
moredistinct,primarycallositiesmoreclearlyoutlinedandmorestronglypolishedon
surface,tertiariesmorestronglydevelopedtoformlongitudinallycontiguousnarrow
ridge; 8)aedeagus(Fig 5)moreacutelycurvedventradataboutapicalquarter,and
morestrongly concave therefrom to apex in right lateral margin, withapjca11obe
longer,1.5timesaslongaswide,andnotremarkablyhookedright lateradindorsal
view
Holotype: , ca. 10.9km southeast of Guazigou (33°18'14″N/104°45'38″E),
3,340minaltitLlde,inthesoutheasternpartofZhugquXiannearthebordersofWudu
XianandWonXian,ofsouthernGansu,China,15-VII-2004,incoll.NSMT.
Notes. Asmentionedintheprecedinglines,thepresentnewspeciesisclosely
similartoC.sement1レ1,its.However,theyaredistinguishablefromeachother inseveral
morphological features,i.e.,differentlyshapedmediantoothofthementum,pronotum
andaedeagus.Thesepeculiaritiesareevidentlyofspecificimportance,notsubspecific,
evenifthegeneral featuresof thebeetlesarecloselysimilar toeachother.Besides,
theywerecollected fromthesamevalleythoughnotstrictlysympatric.These facts
suggestthattheyshouldberegardedastwodistinctspecies,notmerelocalracesina
singletaxon.
The present new species is sympatric with Hypsoca,・abus mlkha11i and
Psetfdoc''amon enJa'm川, both of which seem to be the commonest Carabina in
Guazigou.
Etymology. Thenewnameisananagramofsementivus.
要 約
井村有希:中国日 省南部の高所から発見されたキンスジキンオサムシ属の2新種. -
2004年の夏に中国 省南部舟曲 南束部の山岳地帯から得られたオサムシ標本のなかに,
キンスジキンオサムシ属に属するふたっの未記載種を認めたため, それぞれにCa1oca1abusse-
n,entivusおよびC nevestim,,sという名を与えて記載した. 両者とも, 既知の同属各種のなかで
は, 四川省北部から記載されたケムネキンスジキンオサムシCt,・,c/lethe,axに近いが, より小
型で, 背面の色彩, 前胸背板側縁の剛毛数, 上翅およびe交尾器の形態などに違いがみられる.
また, 今回記載された2新種もたがいにひじょうによく似てぃるが, 下11基ﾄ節中央歯や前胸背
板, e交尾器などの形態が異なることによって識別される.
References
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Englishtitle,descriptionandsummary)
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