Hind Wing Polymorphism Confirmed in the Coloninae (Coleoptera, Leiodidae)

2010·0.42 MB·English

by  Nishikawa, M

Elytra,Tokyo,38(2):267!269,November13,2010
Hind Wing Polymorphism Confirmed in the Coloninae
(Coleoptera, Leiodidae)
Masaaki NISHIKAWA
Kashiwagaya1112!16,Ebina,243!0402Japan
[email protected]
Abstract The occurrence of a hind wing polymorphism in the subfamily
Coloninaeisconfirmedforthefirsttime.
Nothinghaspreviouslybeenknownontheoccurrenceofhindwingatrophyinany
colonine beetle species, despite the existence of apterous condition ordinarily known in
awiderangeofotherleiodidsubfamilyspecies(cf.N:LIDC,2005). Recently,Ifound
some specimens of a brachypterous Colon species besides a specimen of macropterous
conditionfromtheKamchatkaPeninsulaandSiberiainmycollection.Thesespecimens
agreed with Colon (Eurycolon) latum KG66IO. This species has a record of its trivial
flight observed in Czech (FA:>H8=:G, 1903) and a widespread distributional range
extending from Europe to Siberia (P:GG:6J, 2004). Very recently, the species was
newly recorded from the Lazovsky Nature Reserve near Vladivostok, the Russian Far
East (R˚JˇO>ˇ8@6, 2009). It is therefore likely to be considered showing as a northern
Palaearctic distribution in a zoogeographical pattern, though unrecorded areas among
Asian localities are spacious. As for specimens of R˚JˇO>ˇ8@6’ record, their hind wings
wereconfirmedasbrachypterouscondition,whichwasalsoconfirmed in those of some
localities in Central and Southeastern Europe, while specimens of macropterous condi-
tion were less commonly coexisting with them only at a few localities (R˚JˇO>ˇ8@6, pers.
comm.).
I therefore show herein the occurrence of a hind wing polymorphism in the
subfamily Coloninae for the first time. This brief paper is published to promote
additional observations of the hind wing condition in colonine collections worldwide,
because the condition has not been used as their diagnostic character (e.g.,
SONB8O6@DLH@>,1969),andconsequentlyhaspossiblybeenignoredfrommorphologi-
cal observations of these specimens.
Colon (Eurycolon) latum KG66IO, 1850
(Figs.1!2)
Brachypterous specimens examined. 1!, Berikul [ca. 56.2092!N 87.0572!E],
Kuznetzkiy Alatau, W. Siberia, Russia, 1!VI!1982, V. EGNH=DK leg.; 2"", near Esso
268 MasaakiN>H=>@6L6
Figs.1!2. Colon (Eurycolon) latum KG66IO, showing hind wing conditions.""1, Macropterous
condition,",fromKuralzhychaVillage,S.UralskiyKhrebet,Russia;2,brachypterouscondition
(0.43mminlength),",fromSyrostanVillage,S.UralskiyKhrebet.
Village [ca. 55.9333!N 158.7!E], 600m in alt., Kamchatskaya Oblast, Kamchatka
Peninsula, Russia, 7!VII!2002; 1!, 1", Kuralzhycha Village [Kuramshina?; ca.
55.1639!N 60.8378!E], Kyschtym District, Chelyabinskaya Oblast, S. Uralskiy Khre-
bet,Russia,5!VII!2000;1!,3"",SyrostanVillage[ca.55.0608!N59.9028!E],Miass
District,ChelyabinskayaOblast,S.UralskiyKhrebet,11!VI!2000;3!!,11"", same
locality, 12!VI!2000.
Macropterous specimen examined. 1", Kuralzhycha Village, Kyschtym District,
ChelyabinskayaOblast,S.UralskiyKhrebet,5!VII!2000.(Allthespecimensexamined
are in my collection.)
Discussion. The hind wing conditions of the specimens examined and their
situationsinEuropestronglysuggestthatC.latumclearlyconsistsofmacropterousand
brachypterous individuals probably showing a geographical cline of their ratio in each
population of its distributional range. The cline expected in this case is similar to the
geographicalclineofawingdimorphismdisplayedin certain North European carabids
(U9K6G9N,1969)butthegeographicalpatternofthecaseisstillunclearjudgingfrom
the present knowledge. Concerning the brachypterous specimens examined, their hind
wings are undoubtedly reduced irrespective of the sex, varying the length even in
HindWingPolymorphismintheColoninae 269
sympatricspecimens. ForexampleinspecimensfromSyrostan,theirwingsarereduced
inlengthasfollows:0.1!0.2mmin2!!and5"",0.2!0.3mmin4"",0.3!0.4mmin
1!and2"",0.4!0.5mmin3"",and0.5!0.6mmin1!. Similarvariationswerealso
observedinthoseofspecimensfromSlovakiaandLazovskyNatureReserve(R˚JˇO>ˇ8@6,
pers. comm.).
In any case, additional confirmation of wing conditions throughout the distribu-
tionalrangeofthisspeciesisrequiredtoreinforcethepredictionandobservationsbased
on geographically sporadic specimens.
IwishtoexpressmydeepgratitudetoDr.JanR˚JˇO>ˇ8@6oftheCzechAgricultural
University,Praha,forgivingmenotonlytheinformationofhindwingconditionsatmy
requestbutalsoimportantcommentsontheearlydraftofthispaper. Specialthanksare
alsoduetoDr.Shun-IchiU´:CDoftheNationalMuseumofNatureandScience,Tokyo,
forcriticallyreadingthe manuscript of this paper. Thanks are due to Messrs. Eduard
Ya. and Oleg B:GADK, Irkutsk, for supplying with specimens which led me to the
discovery of these phenomena.
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