A New Subspecies of Macrodorcas okinawanus (coleoptera,Lucanidae) from the Ryukyu Islands

2 Pages·1991·1.7 MB·English

by  Hori, S

Elyt1・a, Tokyo,19(1):75-76, May15, l991
ANewSubspeciesofMacrodorcasokinawanus(Coleoptera,
Lucanidae) fromtheRyukyu Islands
ShigehisaHoRI
Kitanosawa2-20-18, Minami-ku,SapporoCity,005Japan
Abstract A new subspecies of Mad・odot(・as okinawa,1us NoMuRA is described
andillustratedfromthesouthernRyukyuIslands,SouthwestJapan.
Macrodorcasok1llaH.,a,1usNoMuRA, l964,wasoriginallydescribedfromOkinawa-
hontoasasubspeciesof M rectus(MoTscHuLsKY, 1857). Later, it wasconsidered
by KUROSAWA (1976) to bea fullspecies, which was split up into twosubspecies,
M.1'ecfMso mail,a'n'sandM.'.amam!a?'t'sNoMURA, 1964. Sincethen,M.o.
oral
FuJITAet IcHIKAwA,1985,has beendescribed from Tokunoshima Is. It is therefore
regardedasanendemicspeciestotheAmami-0kinawagroupofthecentralRyukyus.
In thesummer of1982, the author found another formof M.okina、l,amis in the
Yaeyamagroup of thesouthern Ryukyus. Despite intensiveandrepeatedsurveys,
onlyasingleindividual hasbeen knownso far. It will bedescribed in the following
lines.
Beforegoing further, theauthor wishestoexpresshissinceregratitudetoPro-
fessor Seiji AzuMA of the University of the Ryukyus, Messrs. Kano SuGIMoTo,
Koji AzuMA, Tokuzo OMoTo, KazuoMINAToand HirokiSATo for their kindaid in
thisstudy,andalsotoMr.FumikiBANDoforpreparingtheexcellentdrawinginserted
inthispaper.
Maclodo,casokinawanusyaeyamaensissubsp
nov.
(Fig. l)
This new subspecies is different from the nominotypica1one in the following
points: l) body above reddishbrown (almost blackishinthenominotypical form);
2) coarsepuncturesonelytralessshiny;3) bodyshorter andbroader;4)mandibles
shorterandbroader inmale;5)pronotumaswideaselytra(wider thanelytrainthe
nominotypica1form); 6) pronota1sideswith lateral angulationroundedandsituated
at basal third.
Length. Male, 28.2mm (incl mandibles), 24.7mm (excl mandibles). Width.
Male,10.0mm.
Locality.Japan(lriomote-jimals).
T)pcspecime/1. Holotype , Urauchi River, lriomote-jima ls., OkinawaProf.,
l6-VIl-1982,S.HoRlleg. TheholotypeisdepositedintheUniversityoftheRyukyus
76 ShigehisaHoR1
Fig. 1. MacrodorcasokinawallusyaeyamaensisHoRl,subspnov.;?,fromIriomote-jimaofthe
Yaeyama[standsinOkinawaPrefecture.
Museum.
Until now only oneindividual has beencaught at theupstream of the River
Urauchiat thewesternsideof Iriomote-jimaIsland. It wasaccidentally foundflying
at night.
要 約
堀 繁久: 、冲 県八重山諸島産リュウキュウコクフガタの1新,Ill種. - 、冲 県の八重山諸島にあ
る西表島で得られたリュウキュウコクノ' ガタ MacrodorcasokinawanusNoMuRA を,調べた結果, い
ままで知られていない形質をもっていることが判明したので, これを新?E極 yaeyamaensis subsp
nov. として記載した. このfiEl種は, 奄美イi幅-および沖系l?イ、f島に分布する M.okinawanussubsPP.に
イ,1.ているが, 体色や点刻, 大、や前1111株板wの形態などの差異に1っ:て区別できる
References
FuJITAH.,& T.1cHIKAwA, l985. A revisionalsynopsisofthefamily Lucanidae(Coleoptera) from
the Nanseiand lzulslands. Gekkan-Mush1,Tokyo, (l70):4-13.
KUROSAWA,Y.,1976. FamilyLucanidae. Check-listCo/copt.Japan,(1):6-7.
NoMuRA,S.,1964. SomenewspeciesoftheColeopterafromLoochoo Is and its adjacent regions,
11. Ent..Rev.Japan, Osaka,17:47-57.