Additional Records of Clytine Species (Coleoptera, Cerambycidae) from the Ogasawara Islands

6 Pages·2001·6.2 MB·English

by  Niisato, T

Elyt,a,「okyo,28(2):437-442,Novemberl5,2000
AdditionalRecordsofClytineSpecies(Coleoptera,Cerambycidae)
fromtheOgasawaraIslands
TatsuyaNllsATo
BioindicatorCo.,Ltd.,Yarai-cho126,Shinjuku-ku,Tokyo,162-0805Japan
and
Haruki RUBE
KanagawaPrefecturalMuseumofNaturalHistory,499,Iryuda,0dawara,
KanagawaProf,250-0031Japan
Abstract Clytinecerambycidbeetlesarenewly oradditionally recorded from
solitaryislandsoffthemain islandsof theOgasawaras. Chief,ophorus kusamaiisbriefly
describedbasedonadditionalspecimensincludingafemale.
Inhisrecent fieldsurveysmadeintheOgasawaraIslands,thejuniorauthor,H.
KARuBE,collectedashortseriesof fourclytinespecies fromsuchsolitary islandsas
Muko-jima, 0toto-jima,Ani-jimaandAne-jima. Although thecerambycid faunaof
theOgasawara Islands iswellsurveyed, very few recordshavebeenmade from the
aboveislands. Inthisshort reportwearegoingtonewly or additionally recordthe
clytinespeciesfromtheseislands.
TotalninespeciesofthreegeneraofthetribeClytinihavehithertobeenrecorded
fromtheOgasawaraIslands.MostofthemexcludingCh1orophorusmuscosus(BATES)
areendemictotheislandsandvery important for analysing thespeciesdiversity in
northernMicronesia.Theclytinespeciesareseldomfoundintheforestareasoftheis-
landsinvestigatedafterabruptchangeofvegetationtookplacebyhumanimpact.0n
Muko-jimaIslan most forestshavebeenchangedintograsslandby feedingof intro-
ducedgoats.All theclytinesseemtobeendangerednow,eventhoughCh1orophorus
kobayash11KoMIYAwasabundantatleast15yearsago.
Theabbreviationsusedinthedescriptionwerealreadyexplainedinrecentpapers
bythefirstauthor.
WewishtoexpressourheartythankstoDr.Shun-IchiUENooftheNationalSci-
enceMuseum(Nat.Hist),Tokyo, forhisconstantguidanceandreadingthroughthe
originalmanuscriptofthispaper.ThanksarealsoduetoDr.MasatoshiTAKAKuwAof
theKanagawaPrefectural MuseumofNatural History, Dr. Kouichi MATSUMOTO of
Tokyo University of Agriculture, Atsugi, Messrs. Toshikazu SAKuRAI, Mamoru
438 TatsuyaNl1sAToandHarukiKARUBE
KIKUcHl andNorikazu TANAKAofOgasawara-mura for their kindhelp inthefield
works.
Xy1otrechusogasan'arensisMATSUSHITA,1933
[Japanesename:0gasawara-ikarimon-tora-kamikiri]
(Fig.l)
Xy1ot,-echusogasawa,-ensisMATSUSHITA,1933,Trans. Sapporonat.Hist. Soc.,12,p 43; typelocality:
Bonins.
ytot,-echus(?viet,echus)ogasavlarensis: KeihinKonchuDokokai(KUsAMA),1959,NewInsectCollect.,
p406.
Specimensexamined. 1 1?,0toto-jimaIs.,Chichi-jimagroupofOgasawara
,
Isis.,0gasawara-mura,Tokyo,Japan,29-VI-1998,H.KARUBEleg.
Distribution. Ogasawara Islands: Ototo-jima Is. (new record), Ani-jima Is.,
Chichi-jimaIs andHaha-jimaIs.
ChlorophoruskobayashiiKoMIYA,1976
[Japanesename:0gasawara-kiiro-tora-kamikiri]
(Figs2-3,9)
Ch1orophoruskobayashiiKoMIYA,1976,Elytra,Tokyo,4,p31, figs1-2,pl 5, figs2,2a,b; typelocality:
Kitamura,Is.Haha-jima,BeninIsis.
Nagahama-
Chlo,-ophorusboninensis:GREssITT,1956,Ins.Micronesia,17(2),p ie6(neeKANO,1930).
Chlo,-ophorusyayeyamensls: KoJIMAeta1.,1965,Res.Rcpt. KochiUniv.,14(Nat.Sci),2(9),p 85 (nee
KANO,1933).
Ch1orophorusbonlrlensisf yaeyamafo(rmisKUsAMA,1973,Rept.Fac.Sci.ShizuokaUniv.,8,p.125;type
locality:Chichi-jima,Yoakeyama.
Specimens examined. 3 , 5 , 0toto-jimaIs., Chichi-jimagroup, 20-VI-
2000,H.KARUBEleg.
Distribution. OgasawaraIslands: 0toto-jimaIs. (new record),Chichi-jimaIs.,
Higashi-jimaIs andHaha-jimaIs.
Notes. Thespecimens fromOtoto-jima Islandarealmost identical with the
Chichi-jimaones. Ineightspecimensexaminedin total, theblack maculationon the
pronotumareclearlyseparatedintoamedianspotandapairoflateralones(theme-
dianspotisdividedagainintotwosmallspotsintwospecimens),andtheelytra1black
bandsareratherreducedandnarrowedasintheChichi-jimaspecimens.
Figs. 1-8. FourspeciesofthetribeClytini fromsolitaryislandsof theOgasawaraIslands. - 1,
y_
1otrechusogasawa''ensisMATSUSHITA,malefromOtoto-jimaIs;2,Chlo,-opho,・ttskobayashii'KoMIYA,
malefromOtoto-jimaIs;3,samespecies, femalefromOtoto-jimaIs;4,C ktlsama1M.SAT0,male
fromMuko-jimaIs;5,samespecies, femalefromMuko-jimaIs;6,C boninensisKANo,malefrom
Ane-jimaIs;7,samespecies,malefromAni-jimaIs;8,samespecies,femalefromMuko-jimaIs.
AdditionalRecordsofClytinesfromtheOgasawaras 439
8
440 TatsuyaN1lsAToandHarukiKARUBE
Chlor()phorllskusamaiM.SAT0,1999
[Japanesename:Mukojima-tora-kamikiri]
(Figs.4-5,10)
chic,・opho,-uskusama1M.SAT0,1999,Elytra,Tokyo,27,p47,figs.1-3;typelocality:Muko-jima,0ga-
sawaraIslands.
Additionaldescription. Thoughthisspecieswascarefullydescribedbytheorig-
inalauthor,onlyasinglemalespecimenwasavailableat that time.Someadditional
descriptionincluding femalecharactersisgivenbelow:
Pubescencelightgrayishgreen;pronotumpovidedwithapairofmediansmall
blackspotsjustbehindthemiddleandapairoflateralonesatthemiddle;inafemale
speimen,themedianspotsaresmallanddistinctlyseparated fromeachother;elytra
withasmallblackspotateachhumerus,whichis isolated (2 )orconnectedwith
theposteriorblackoneatbase(19),anarcuateblackmaculationnearbasalthird,and
rathernarrow incompletetransverseblackbandsataboutmiddleandapical fourth,
whichformoblongspotsaccordingtoindividuals.
Male. Median lobewithapical lobe fairlyshort,moderatelyarcuateat sides
nearbasalthirdL,andarcuatelynarrowedtoratherwidelyroundedapex.Paramerewith
each lobespatulate, remarkablyelongateandstronglybroadened toapical 2/5,nar-
rowlyseparatedfromeachotherthoughdistinctlyapproximateatapical2/5.Standard
ratios of body parts as follows: HW/PA 1.08-1.14, HW/PW 0.77-0.85, PL/PA
1.48-1.62, PB/PA 1.12-1.23, PL/PW 1.06-1.l4, PW/EW 0.81-0.82, EL/EW
2.35-2.40.Bodylength10.1-108mm.
9
10
Figs. 9-10. MalegenitalorganofChlo,-ophoruskobayashi, KoMIYA(9)andCh1orophoruskusama1M
SAT0(10);a,apicalpartofmedianlobeindorsalview;b,paramereindorsalview.
AdditionalRecordsofClytincsfromtheOgasawaras 441
Female. Body broader thaninmale. Headalittlesmaller thaninmale, dis-
tinctly narrower thanpronotum,withthinner antennaebarelyreachingthemiddleof
elytra. Pronotumas longas wide,slightly narrower thanelytra, widest at middle,
stronglynarrowedapicad.Elytrabroa well convex, ratherweakly narrowedapicad.
Laststernitetrapeziform,arcuateatapicalmargin.Standardratiosofbodypartsasfol-
lows: HW/PA 1.13, HWPW 0.64, PL/PA t 75, PB/PA t38, PL/PW 1.00, PW/EW
0.88,EL/EW2.44.Bodylength12.8mm.
Specimense-)cammed. 2 ,1?,Muko-jimaIs.,Muko-jimagroup,28-VI-2000,
H.KARUBE&K.MATSUMOTOleg.
Distribution. OgasawaraIslands:Muko-jimaIs.
nenf ' Motes. C tot,op onfs /afsama1 is closest to C c/o ayas(cid:0) i th patter o pu
bescentmaculationonthedorsumandbasicstructureofthemalegenitalorgan. The
twospeciesareallopatric intheOgasawaraIslands,andformasmallcomplexinthe
groupofCyaeya,;7e17sls.
Chlolop11orusbonillellsisKANO,1933
[Japanesename:0gasawara-tora-kamikiri]
(Figs6-8)
Chief・opho1・1lsbonlnenslsKANO,1933,Kontyu,Tokyo,7,p.135,fig;typelocality:Is.Chichi-jima,Benin
ISIS.
X、lof・iechtlsbonlnenslsKANO,1930, Bull biogcogr.Soc.Japan,1,p 242,pi t5, fig 3; typelocality:
BeninIsis.
C/1/01・0p/10,・lls ll加 llefilsc1ar1ls(CAsTELNAUetGORY)subsp. 0'll'Ie'Isis: MITON0, [1941],Cat.C0leOPt.
Japon.,(8),p.120;typelocality:BeninIslands(Titisima).
specimenseMmlned. 2 ,Muko-jimaIs.,Muko-jimagroup,28-VI-2000,H.
KARuBEleg;1e,Uguisu-hamaBeach,Ani-jimaIs.,Chichi-jimagroup,27-VI-1998,
M.TAKAKUwAleg; l Ane-jimaIs.,Haha-jimagroup,19-VI-1999,H.KARUBEle9.
,
Djstrjbutjon. OgasawaraIslands:Muko-jimaIs.(newrecord),Ani-jimaIs.(new
record),Chichi-jimaIs.,Haha-jimaIsandAne-jimaIs.(newrecord).
Notes Geographjca1variationinnewlocalities,Ani-jimaIs.,Ane-jimaIs and
Muko_jjmaIs., isnotapparent,sincewewereabletoexamineonlyoneortwoSpeci-
mensfromrespectiveislands.Externally,thespecmi ensfromnewlocalitiesShowthe
followingcharacteristics.
):Thecolourofdorsalpubescenceisochraceousyellow,al-
Muko_jjmaIs. (2
mostasjnc kobayashj1'.ThedorsalblackmaculationisfairlyreducedasinsymPat「IC
c kusama1'.TheblackmaculationonthepronotumformsthreeisolatedSpots(theme-
djanspotjnonefemaleisaml ostdividedintotwosmallones).Oftheblackmaculation
ofeachelytron,thesmallhumeralspotisnarrowlyconnectedwiththeJ-ShapedmaCu-
1atjonnearbasal third,andthetransversebandsataboutmiddleandapical thi「da「e
narrow,themedianonenotreachingtheexternalmargininonefemaleSpecimen・
):Thecolourofdorsalpubescenceisslightlyreddishooh「aCeOuS
Anj_jjmaIs. (1
442 TatsuyaNIIsAToandHarukiKARUBE
yellow, fairlyyellowishascomparedwiththatofChichi-jimaspecimens.Theblack
maculationonthepronotumisnarrowlyseparatedintothreespots,andtheblackone
nearbasalthirdoftheelytronformsaJ-shape(widelyopenexternally).
Ane-jimaIs. (1e):Thecolourofdorsalpubescenceisreddishochraceousyellow,
almost intermediateincolorationbetweenChichi-jimaandAni-jimaspecimens. The
blackmaculationonthepronotumisratherwidelyseparatedintothreespots,andthe
blackonenearbasal thirdoftheelytraformssemi-quadratering-shapeasinHaha-
jimaandChchi-jimaspecimens.
要 約
新里達也・苅部治紀: 小笠原諸島の小島嶼におけるトラカミキリの記録. - 小笠原諸島
のカミキリムシ科甲虫類の記録は, 父島および母島に集中し, そのほかの小島嶼の分布記録が
ほとんど知られてぃなぃ. 今回, これら小島嶼のうち弟島, 兄島, 姉島および聲島において,
昆虫類調査を行った際に得られた4種のトラカミキリ類を記録した. 各島嶼における新記録お
よび追加知見は以下のとおりである.
1) オガサワライカリモントラカミキリ:弟島新記録.
2)オガサワラキイロトラカミキリ:弟島新記録.前胸背板の中央黒絞は2つに分離する個体
があるが, 基本的には父島の個体群と変わらない.
3) ムコジマトラカミキリ:原記載以来の追加記録. 雌は初記録となる.
4) オガサワラトラカミキリ :兄島, 姉島および 島新記録. 検した個体数は1~2個体に過
ぎないが,既産地の父島および母島の個体群に比べると,背面被毛の色彩や黒絞の形状に島嶼
ごとの地理的変異が認められる. とくに 島の個体は, 同所的にいるムコジマトラカミキリに
似て, 黒紋が縮小傾向にある.
なお,今回の調査において採集されたトラカミキリの個体数は,一部の例外を除けばきわめ
てわずかであった. これは,人為的遷移による森林植生の変化や,野生化したヤギの食害によ
る森林の草原化が主要な原因だと考えられ,食材性カミキリムシの多くの種が絶減の危機に瀬
していることを推測させる.
References
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