A New Species of the Genus Ochthephilus (Coleoptera, Staphylinidae) from Taiwan

2007·4.8 MB·English

by  Watanabe, Y

Elyt・,a,Tokyo,35(1):55-59.May30,2007
ANewSpeciesoftheGenusOchthephiius
(Coleoptera,Staphylinidae) fromTaiwan
Yasuaki WATANABE
Laboratoryof InsectResources,TokyoUniversityof Agriculture,
Atsugi,Kanagawa,243-0034Japan
Abstract A new species of thestaphylinid genusOchthephiltls isdescribed
under thenameof 0.masatakai. Itisobtained fromunderdeadleavesaccumulated
atthestreamsideinabroadleaved forest on Mt. Alishan.central Taiwan.
ThemembersofthegenusOchthephilusMULsANTetREYareusuallyfoundunder
dead leavesaccumulated at thestreamside inmountain areas, and havebeenknown
widespreadthroughout theworld.However,nospeciesofthisgenushashithertobeen
reported fromTaiwan.
ExaminingtheTaiwanesestaphylinids depositedin thecollectionof Insect Re-
sources,TokyoUniversityofAgriculture,Ihavefoundsomespecimensofaninteresting
speciesbelongingtothegenus. Afteracloseexamination,ithasbecomeclear thatthis
speciesisnewtoscienceonaccountofdisagreementwiththeknownspeciesinexternal
featuresandconfigrationofgenitalorganinthemale.Itwillbedescribedinthepresent
paperindedicationtothememoryofthelateDr.MasatakaSAT0,whowasoneofthe
mostrenowndspecialistsoftheColeopterainJapanandmademanycontributionstothe
coleoptero1ogyinEastAsia. Thetypespecimensofthenewspeciesaredepositedinthe
collectionoftheLaboratoryofInsectResources, TokyoUniversityofAgriculture.
Beforegoingfurther, IwishtoexpressmyheartythankstoDr.Shun-lobiU直NO,
VisitingProfessoratTokyoUniversityofAgriculture, forhiskindadviceonthepresent
study. Deepgratitudeis alsoduetoMr.Junnosuke KoNToH, Laboratory of Insect
Resources,TokyoUniversityofAgriculture,for takingthephotographinsertedinthis
paper.
Ochthephilusmasatakai Y.WATANABE,sp nov.
(Figs. l-6)
Body length: 3.8-4.1mm (fromfrontmarginof head toanalend);1.8-2.1mm
(fromfrontmarginofheadtoelytra1apices).
Fuscousandsubopaque,withpalpiandantennaereddishbrown,legsyellow,except
for more or less infuscated tibiae.
M ale. Headsubdepressedabove,distinctlybroaderacrosscompoundeyesthan
56 Yasuaki WATANABE
Fig. 1. Ochtheph11usmasatakaiY.WATANABE,sp nov.,(f, from Alishanofcentral Taiwan.Scale
1.0mm.
long (width/length=1.33);postocular part arcuateandshort,ahalf as longasthe
longitudinaldiameterofeacheye;surfacecoveredwithfinecoriaceousgroundsculpture
and somewhat sparingly punctured, thepuncturebecoming closer and coarser in
postero-1atera1areasthaninante-medianarea,providedwithalongitudinaldepression
insideeachantennal tubercle. Antennaemoderatelylong,extendingtonearanterior
thirdofelytraandslightlythickenedinapical threesegments,twoproximalsegments
subopaque, theremainingsopaque,1stsegment robust andsomewhatdilatedapicad,
apparently longer thanwide (length/width=1.49),2ndconstrictedat thebase,dis-
tinctly longer thanwide (length/width=1.33),muchshorter (2nd/1st=0.71) and
narrower(2nd/1st=0.60)than1st,3rdelongate,abouttwiceaslongaswide,somewhat
longer(3rd/2nd=1.20)thanthoughaswideas2nd,4thto6thequalinbothlengthand
width to oneanother, each distinctly longer than wide (length/width=1.33) but
apparentlyshorter(eachof4thto6th/3rd=0.67)thanthoughaswideas3rd,7thand
8thequal inboth lengthandwidthtoeachother,eachsomewhat longer thanwjde
New 0c11thephiitlsfromTaiwan 57
(length/width-1.25) anddistinctlywider(eachof7thand8th/6th=1.33) than6th,
9thslightly longer than wide (length/width=1.11), equal in length thoughslightly
wider than8th(9th/8th=1.13),10thaslongaswide,equal inlengththoughslightly
wider than9th (10th/9th=1.11),11thsubova1,distinctlylonger thanwide(length/
width=1.40),apparentlylonger (11th/10th=1.40) thanthoughaswideas10th.
Pronotumgentlyconvexandtransverse(width/length=1.27),slightlywider than
head (pronotum/head=1.17), widest at anterior thirdandmorestrongly narrowed
posteriadthananteriad;lateralsidesarcuateinanteriorhalvesandsomewhatemargi-
nateinposteriorhalves,anteriormargingentlyarcuate,posteriormargin feeblybisinu-
ate,anterioranglesnarrowlyroundedthoughinvisiblefromdorsalside,posteriorones
rectangular;surfacedensely,finelypuncturedandcoveredwithfinecoriaceousground
sculpture,andshallowly,U-shapedlydepressedat themiddlebeforeposteriormargin,
thedepressiondividedinto twopartsbyaweaklongitudinalelevationat themiddle.
Scutellumsubtriangular,surfacefinelypuncturedandcoveredwithfinegroundsculp-
tureasonpronotum. Elytraquadrate,almostaslongasbroad,nearlytwiceaslongas
and 15 times as wideaspronotum, posterior margin somewhat emarginate at the
middle, posterior angles narrowly rounded; surfacemore densely and much more
coarselypunctured than inpronotum,eachelytronprovidedwithapair of obscure
depressions,ofwhich thehumeraloneisdeeper thanposteriorone. Legsmoderately
long,protarsinotsowidened,lastsegmentofmetatarsusremarkablylongerthantwo
precedingsegmentstogether.
Abdomenelongate,almostparallel-sided,exceptfortwoapicalsegmentswhichare
abruptlynarrowed towardstheanalend; basal four tergiteseachmoderatelyclosely
covered wjth fineandsuperficialpunctures, 5thvisibletergitelessdenselyand less
coarsely punctured thanon thepreceding tergites; 8th sterniteslightly andwidely
3
Fjgs 2-3. Abdominal sternitesof 0c/1thephlltlsmasatakaisp nov;8thsternite (2);9thsternite(3)
Scale:0.2mm(2),0.1mm (3).
58 YasuakiWATANABE
Figs 4-6. MalegenitalorganofOchthephilusmasataka1sp nov;dorsalview(4), lateralview(5),
andventralview (6).Scale:0.25mm
emar9inateat themiddleofposteriormargin;9thsternitespatulate,distinctlydilated
towardstheroundedapex,surfaceprovidedwithfiveorsofinesetaeneartheposterior
part.
Genital organ trilobedandsymmetrical. Median lobeelliptical,morestrongly
narrowedapicadthanbasad,apicalpartabruptlynarrowedtowardsthebluntlypointed
apex. Paramereselongate,remarkablylongerthanmedianlobe,eachslightlydilated
insidenearthemiddleandthensomewhatnarrowedtowardstheroundedapex.
Female. Similar ingeneralappearancetomale,butdifferent fromit inthe8th
abdominalsternitealmoststraightatthemiddleofposteriormargin.
Typeseries. Holotype: , allotype:早,Alishan, Chiayi Hsien, Formosa,17-v-
l968,Y.WATANABEleg. Paratypes:3 2-9 ,samedataasfor theholotype.
,
zstrfbutlon. Taiwan.
Remarks. The present new speciesseems tobeplaced near 0. 、)ulgaris (Y.
WATANABEet Y.SHIBATA, 1961) fromJapan inviewof havingsimilar faciesand
antennal articulation, but differs from it in the followingpoints: head lesscoarsely
punctured, antennaelessthickened inapical foursegments,10thsegment aslongas
Wide,pronotummorestronglynarrowedposteriadinposteriorhalf,lateralsjdesmore
St「onglyemarginateinposteriorhalves,elytramoredenselypunctured,andmalegenjta1
o「ganwithmedian lobeproducedposteriadat theapex. Also resembles in general
aPPea「anCe0.mOntCiola (CAMERON,1924) fromtheSimlaHillsof India,butdiffers
f「omit inthesmallerbody,headsparinglyandsomewhatcoarselypunctured,8thand
9th antennal segmentseachslightly longer thanwide; pronotum closely and finely
New 0c11thephilitsfromTaiwan 59
puncturedinanteriorhalfofmedianlineasinotherpart;elytraaslongaswideand
morethant5timesaslongaspronotum,surfacestronglypunctured;abdominaltergites
eachsomewhatsparinglyandsuperficiallypunctured.
Bionomics. Allthetypespecimenswereobtainedfromunderdeadleavesaccumu-
latedat thestreamsideinabroadleaved forest onMt.Alishanofcentral Taiwan.
Etymology. ThisnewspeciesisdedicatedtothememoryofthelateDr.Masataka
SAT0, whowasaclose friendofminethrough thestudyoftheColeoptera.
要 約
渡辺泰明:台湾から採集されたョコセミソハネカクシ属(甲虫目ハネカクシ科)の1新種. -
台湾からはこれまで, ョコセミソハネカクシ属の種が報告されていなかった. 最近, 東京農業大
学に収蔵されている台湾産ハネカクシ類を検討している過程で, 本属に含まれる新種を見出した
ので, Ochthephilusmasataka1と命名し記載した. なお, 種名は生前,東アジアの昆虫相に関して
多大の貢献をされた故佐藤正率博士に献名したものである.
References
cameron,M.,1924. NewspeciesofStaphylinidaefromIndia.Tratlsent.Soc.London,1924:160-198.
WATANABE,Y.,&Y.SHIBATA,1961. OnthegenusAncyrophorusinJapanWithdesc「iPtiOnSoffOu「new
species(Col.Staphylinidae). Jagric.Sol.,TokyoNogyoDalgak1l,7:6-9.