A new species of Incertella Sabrosky (Diptera: Chloropidae) from the White Sea coast, Russian Karelia

2009·1.1 MB·

by  Emilia Nartshuk

©EntomologicaFennica.30March2009
Anew species of Incertella Sabrosky (Diptera: Chloropidae)
from the White Sea coast, Russian Karelia
EmiliaP.Nartshuk&AndreyA.Przhiboro
Nartshuk,E.P.&Przhiboro,A.A.2009:AnewspeciesofIncertellaSabrosky
(Diptera:Chloropidae)fromtheWhiteSeacoast,RussianKarelia.–Entomol.
Fennica20:4–8.
Anewchloropidspecies,Incertellakarteshensissp.n.withdarkenedwings,is
describedfromtheWhiteSeacoast(northernKarelia,Russia).Thediagnostic
charactersofthenewspeciesarediscussed.
E.P.Nartshuk&A.A.Przhiboro,ZoologicalInstitute,RussianAcademyofSci-
ences, 199034 St. Petersburg, Russia; E-mails: [email protected] (E. P. Nart-
shuk);[email protected](A.A.Przhiboro)
Received28June2007,accepted19November2007
1.Introduction 2.Methods
ThegenusIncertellaSabroskyincludesfivespe- Allspecimensofthenewspecieswerecollected
cies known from Europe (Nartshuk 1984). All usingorangeplatesfilledwithwater.Theplates
these species except for I. antennata (Collin) wereinstalledonthegroundandusedduringthe
wererecordedfromEuropeanRussia.Sometimes period of time when the high tide level did not
ConioscinellanigrifronsDudaisalsoconsidered reach them (see Habitat). No specimens of the
inIncertella,butthegenericpositionofthisspe- new species were collected by other techniques
ciesremainsunclear. (net-sweeping,stickytraps,samplingwithaspi-
Many species of the subfamily Oscinellinae rator)thatwereextensivelyusedatthesamelo-
(Chloropidae),mostly fromthegeneraElachip- calityduringseveralseasons.
tera Macquart, Rhopalopterum Duda, Eribolus Allspecimenswerestoredin70%ethanoland
Becker, Incertella Sabrosky and Microcercis slide-mounted in Canada balsam, partly dis-
Beschovski,inhabitwetlands,suchaswetmead- sected. Measurements were made from slide-
ows,marshes,bogs,fens,andshoresofdifferent- mounted specimens using ocular micrometers.
typewaterbodies.TheknownEuropeanspecies Thewinglengthismeasuredfromthewingbase.
ofthegenusIncertellaSabroskyaremesophilous The photographs were taken from the slides,
(I. albipalpis Meigen, I. kerteszi Becker) or layer by layer, using a Leica DF C320 digital
hygrophilous (I. antennata (Collin), I. scotica cameraandaLeicaDM5000Bmicroscope.The
(Collin),I.zuercheriDuda). finalimageswerecreatedfromseriesoflayer-by-
Thenewspecieswhichisdescribedherewas layer photos using Helicon Focus 4.10 Pro and
collected in northern Karelia at the White Sea cleared using Helicon Filter 4.50 and Adobe
shore,fromcoastalmeadowsintheboundsofthe PhotoshopCSsoftwarepackages.
upperintertidalzone.Thenewspecieshasape- The material was collected, mounted and il-
culiarcombinationofcharactersandanuncom- lustratedbyA.Przhiboro.
mon feature for the Chloropidae, the strongly ThemorphologicalterminologyfollowsMc-
darkenedwings. Alpine(1981).
ENTOMOL.FENNICAVol.20 (cid:127) AnewIncertellafromtheWhiteSeacoast 5
3.Descriptionofthenewspecies, the densely dusted ocellar triangle and scutum,
Incertellakarteshensissp.n.(Figs1–2) likeinI.albipalpis,I.antennataandI.kerteszi;
fromI.scotica,alsobyahighernumberoforbital
Type material. Holotype: #, Russia, Karelia, bristles(6–8inthenewspecies,4–5inI.scotica);
LoukhiDistr.,66°20’N33°38’E,seashore,upper andfromallPalaearcticspeciesofthegenus,by
intertidal zone, 5.VII.2000. Paratypes: 1#, 1$, the comparatively strongly darkened wings.
samelocality,3.VII.2000. Shorttriangularcerciofthenewspeciesaresimi-
Theholotypeandtheparatypesaredeposited lartothecerciofI.albipalpisandI.kerteszi,but
inthecollectionofZoologicalInstitute,Russian thesurstyliarenarrower.
Academy of Sciences, St. Petersburg. All type Description.Bodyentirelydark,blacktodark
specimensareonslidesinCanadabalsam. brown. Head (Fig. 1a): Frons nearly square,
Diagnosis.Thenewspeciesisdistinguished slightlynarrowinganteriorly,withanteriormar-
from I. albipalpis Meigen, I. antennata Collin gin straight. Ocellar triangle densely dusted,
andI.kertesziBeckerbytheentirelydarkbody; reachinganteriorone-thirdoffrons,with5setu-
fromI.zuercheriDudaandI.scoticaCollin,by laeonlateralmargin.Orbitalsetae6–8(7and8,
Fig.1.Incertellakarte-
shensissp.n.(head
andlegs).–a.Head,
dorsally.–b.Antenna,
3rdsegmentandarista,
laterally.–c.Foreleg.
–d.Middleleg.–e.
Hindleg.a,c,d,e:
male,holotype;b:fe-
male,paratype.
6 Nartshuk&Przhiboro (cid:127) ENTOMOL.FENNICAVol.20
Fig.2.Incertellakarteshensissp.n.
(wings,femaleabdomenandmale
genitalia).–a.Wingofmale.
–b.Wingoffemale.–c.Abdomen
offemale.–d.Malegenitalia:
anteriorview.–e.Malegenitalia:
outerparts,posteriorview. –f.Male
genitalia:hypandrium,rightsur-
stylusandpartofepandrium.
–g.Abdominalapexoffemale,
ventrally.–h.Abdominalapexoffe-
male,dorsally.a,d,e:male,holo-
type;f:male,paratype;b,c,g,h:fe-
male,paratype.
inholotype),small,notdistinguishedfromfron- covered with irregular rows of tiny setae. Scu-
tal setulae. Postocellar setae rather short, sepa- tellumsmall,semicircular.Notopleuralsetae1+
ratedwiderthanhindocelli.Ocellarsetaesituated 1. Legs (Fig. 1c–e): All femora dark brown to
lateral to fore ocellus. Gena narrow. Eyes with black, hind femur narrowly pale at apex, wider
sparsefinehairs(visibleonlyathighmagnifica- thanmiddleandforeones.Femoralorganonmid-
tionandnotdisplayedonFig.1a).Antenna(Fig. dlefemurnotdeveloped.Foreandmiddletibiae
1b):Firstflagellomeresmall,widerthanlong,its brownishblackwithpalerends.Middletibiawith
length:widthas5:8.Aristaratherlong,shortly aspur(brokenonFig.1d).Hindtibiayellowwith
pubescent,itssecondsegmentslightlythickened. brownish black band in the middle occupying
Lengthsofsecondandthirdsegmentsofaristaas one-fourthoftibialength(inholotype),orbrown-
3:10. ish black with paler base (in paratypes). Tarsi
Scutum slightly convex, densely dusted and pale.Basitarsiofmiddlelegswithsetaeventrally;
ENTOMOL.FENNICAVol.20 (cid:127) AnewIncertellafromtheWhiteSeacoast 7
Fig.3.ThehabitatofIncertellakarteshensissp.n.attheWhiteSeashore.–a.SeldyanayaInlet,viewfromthe
mouthatneaptide(arrowsindicatesites2and4,wherethenewspecieswascollected).–b.Theupperinter-
tidalzoneatsite2(arrowsindicatethelowerandupperboundariesofthezone).
apicesofallsegmentsofmiddletarsiwiththick theaveragehightidelevelofspringtide(ca.1.7
setae; hind basitarsi without peculiar setae. mand 2.1 min height, respectively). It borders
Wings (Fig. 2a–b) longer than abdomen, rather the middle intertidal zone from below and the
narrow;winglength:widthas11:4.Wingsur- supralittoralzonefromabove.
faceintenselydarkenedexceptforalighterarea The holotype and the female paratype were
betweenveinsMandCuA;inmale,wingcolor- collectedfromsite2(notfarfromtheinletend),
1
ationmorecontrasting.Costalsectors1:2:3:4 themaleparatype,fromsite4(attheinletend).At
as11:9:8:6.Forebasalcellnotwidened.Veins boththesites,thezoneisabout3mwideandoc-
R andMdivergent.Halterespale. cupied by the tidal meadow. Site 2 (Fig. 3b) is
4+5
Abdomendarkbrown.Femaleabdomen(Fig. characterizedbysandy-muddysoilwithadense
2c,g,h)tapering,withtelescopicoviscaptandsoft turf;JuncusgerardiiLoisel.,Agrostisstolonifera
unsclerotized cerci. Subanal plate triangular; L.andPoapalustrisL.predominate.Site4isoc-
subgenitalplatewiderandrounded. cupied by the stands of Phragmites australis
Malegenitalia(Fig.2d–f):Epandriumsmall, (Cav.)Trin.exSteud.onmoistmuddysoil.
cerci short-triangular, each with a long seta at Etymology.ThespeciesisnamedafterCape
apex,widelyseparatedbyasemicircularhollow. Kartesh, the place near the type locality, where
Surstyli narrow in hind view, lamelliform with theBiologicalStationoftheZoologicalInstitute
rounded apex in lateral view. Hypandrium (ob- issituated.
servedonlyinparatype,Fig.2f)probablyopenor
partly damaged. Gonites not divided, with
roundedtip.Baseofphallusrounded. 4.Discussion
Measurements. Body length 1.6 mm (male,
paratype), 2.2 mm (female, paratype). Wing Thegenericpositionofthenewspeciesrequires
length1.25mm(male,holotype),1.3mm(male, some comments as the scopes of the genera
paratype),1.4mm(female,paratype). Incertella Sabrosky, Microcercis Beschovski,
Habitat(Fig.3).Thetypelocalityisthenar- CyclocerculaBeschovskiandsomerelatedgen-
row Seldyanaya Inlet, Kandalaksha Bay of the eraarenotexactlyclear.Thenewspeciesisprovi-
WhiteSea,neartheBiologicalStationoftheZoo- sionallyplacedtoIncertella.Thegenuswasde-
logical Institute (Fig. 3a). All specimens were scribed by Sabrosky (1980) in the revision of
collectedneartheendoftheinletwithintheupper NearcticgeneraofChloropidae.Includedspecies
intertidalzoneofthesea.Thiszoneextendsfrom werecharacterizedas“Smallslenderspecieswith
theaveragehightidelevelofneaptideandthatof heavilygraytomentosefrontaltriangleandmeso-
8 Nartshuk&Przhiboro (cid:127) ENTOMOL.FENNICAVol.20
notum,and1anteriorand1posteriornotopleural Newly collected specimens of I. kerteszi and
bristles”(p.420),“afemoralorganof2rowsof I. scotica have slightly evenly darkened wings
closely placedwartsbearingshort,stoutspines. (accordingtothepersonalcommunicationbyM.
[…].Malegenitaliaasdescribedandfiguredby von Tschirnhaus), and this coloration can dis-
Andersson(1977)for“Tropidoscinis”albipalpis appear with time. Both sexes of Chlorops mei-
(Meigen), the cerci distinct and the surstyli flat geniiLoewandC.rossicusSmirnovhavetheen-
and simple” (p. 421). The original description tire surface of wings slightly darkened as well.
notesthepresenceofsetulaeonthelateralmargin Black wing spots are more common among
oftheocellartriangleaswell. chloropidspeciesdistributedintheOrientaland
Ismay(1993)inthediscussionaboutthege- Afrotropicalregions.
nericpositionofIncertellascotica(Collin)noted
thattheanteriormarginofthefronsisconvex(ac- Acknowledgements. We are grateful to Mr. Sergey V.
tually, straight?) in all British species of Incer- Aibulatov,Dr.AndreyI.KhalaimandDr.AlexanderG.
Kirejtshuk(ZoologicalInstitute,St.Petersburg)forhelpin
tella,exceptI.scoticawithconcavemargin.The
preparationofillustrations,toDrs.Tat’yanaV.Egorova
newspecieshasdustedocellartriangleandscu-
andNikolaiN.Tsvelev(KomarovBotanicalInstitute,St.
tum,setaeonthelateralmarginoftheocellartri- Petersburg)foridentificationofplants,andtoDr.Michael
angle, and small triangular male cerci as in I. von Tschirnhaus (University of Bielefield) for careful
albipalpis,I.kertesziandMicrocercistrigonella reading of a preliminary manuscript, many useful com-
mentsandsuggestions.TheworkofE.P.Nartshukwas
(Duda). Three last species are characterized by
supportedbyagrantfromtheRussianFoundationforBa-
theclosedhypandrium,notopleuralsetaeusually
sicResearch(no.08-04-00168),agrantfromtheMinistry
1+1, and convex anterior margin of the frons. ofScienceandTechnologyofRussiaforleadingscientific
Some specimens of I. albipalpis have two hind schools (no. NSh-2329.2008.4), the programmes of the
notopleuralsetae(accordingtothepersonalcom- PresidiumoftheRussianAcademyofSciences“Scientific
BasicsofBiodiversityConservationinRussia”and“Ori-
munication by M. von Tschirnhaus). Unfortu-
ginandEvolutionofBiosphere”,andtheprogrammeofthe
nately,theshapeofhypandriuminthenewspe-
DepartmentofBiologicalSciencesoftheRussianAcad-
cies is unclear. The surstyli in I. albipalpis, I. emyofSciences“FundamentalBasicsofBiologicalRe-
kertesziandM.trigonellaarewide,nottapering, sourcesManagement”.TheworkofA.A.Przhiborowas
and with rounded apex in lateral view. If the supported by an INTAS fellowship for young scientists
(Ref.Nr05-109-4799)andagrantfromtheMinistryof
epandrium is viewed from behind, the surstyli
ScienceandTechnologyofRussiaforleadingscientific
look concave at apex as their inner surfaces are
schools(no.NSh-5577.2006.4).
concave. I. scotica has concave margin of the
frons, the second small hind notopleural seta,
semicircular cerci, short tapering surstyli and References
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