Finnish flies of the family Therevidae

2006·0.8 MB·

by  Antti Haarto

©EntomologicaFennica.3March2006
Finnish flies of the family Therevidae
AnttiHaarto&KajWinqvist
Haarto,A.&Winqvist,K.2006:FinnishfliesofthefamilyTherevidae.—Ento-
mol.Fennica17:46–55.
Anillustratedkeyforthe17FinnishspeciesofTherevidaeispresentedthatin-
cludessixspeciesrecordedfromneighbouringareas.DistributionsoftheFinnish
species are discussed and presented in maps; evaluations concerning the
threatenednessstatusofFinnishspeciesareincluded.
Antti Haarto, Zoological Museum, Section of Biodiversity and Environmental
Science, University of Turku, FI-20014 Turku, Finland; E-mail: antti.haarto
@turkuamk.fi
Kaj Winqvist, Zoological Museum, University of Turku, FI-20014 Turku, Fin-
land;E-mail:[email protected]
Received31January2005,accepted13July2005
1.Introduction
book on lower Brachycera (Stubbs & Drake
2001)lacksmanyFinnishspecies.Themostac-
FliesofthefamilyTherevidaebelongtothesub- curate key for determining Finnish Therevidae
orderBrachyceraandarerelativelylargeDiptera. was presented by Lyneborg and Spitzer (1974);
UnlikeAsilidae,amorphologicallyandbiologi- thiskeycoverstheCzechRepublicfauna.
cally close family, adults of Therevidae are not Thepurposeofthisarticleistoprovideanup-
predatoryandlackthedeepgroovebetweenthe dated key for the Finnish Therevidae and some
eyescharacteristicofAsilidae. speciesfoundintheneighbouringcountries.The
InFinland,therehasbeenverylittleinforma- distributionandhabitatassociationsforeachspe-
tionpublishedonTherevidae.Frey(1911)listed ciesarebrieflydiscussedbasedonthefewavail-
some of the oldest records for the lower abledistributionalandecologicaldata.Aprelimi-
Brachyceranflies.Intheirexchange-scorecata- nary understanding of the Finnish Therevidae
logue,Frey etal.(1941)recorded13speciesof faunawasobtainedduringtheautumn2003,the
TherevidaeasbeingFinnishbutusingnamesthat Finnish museum material of Therevidae was
arecurrentlyinvalid.Hackman’s(1980)checklist checkedforaBrachycerachecklist(Kahanpää&
included20speciesofTherevidae. Winqvist 2005). Three species listed by Hack-
Aftertheturnofthenewmillennium,anew man(1980)appearednottobelongtotheFinnish
waveofdipterologicalinteresthasbeguninFin- fauna: both European Cliorismia species had
land.Aslargeandconspicuousflies,Therevidae been recorded In Russian Karelia, and Thereva
canbeconsideredasuitablegroupforresearch, circumscripta (Loew) is a more southern Euro-
buttherehasbeenalackofupdatedtaxonomicin- peanspecies.Nowthereare17speciesofThere-
formation.Forexample,theTherevidaekey for vidaeknownfromFinland.
theEuropeanpartofRussia(Zaitsev1988)leads Thereremainsalottobediscoveredaboutthis
to unreliable or inadequate identifications of elusiveflyfamily.Newstudiesareneededtoob-
FinnishTherevidae.Furthermore,arecentBritish tainamoreprofoundunderstandingofthedistri-
ENTOMOL.FENNICAVol.17 (cid:127) FinnishTherevidae 47
Fig.2.Themiddle
Fig.1.(A)TheantennaeofDialineuraanilisand(B)Acrosathe femorainanteriorview
annulata. ofAcrosatheannulata
male.
Fig.3.Theheadof(A)Dichoglena
nigripennisand(B)Psilocephalaimberbis
males.
Fig.4.Thetipofaedeagusinlat-
eralview.(A)Cliorismiaardeaand
(B)Cliorismiarusticamales.
butions, ecological associations, and conserva- Female:Fronswithacontinuousordivided
tionstatusofTherevidaespeciesinFinland. shinyblackcallus(frontalcallus) Thereva
4a Knobofhaltereslight 5
4b Knobofhalteresdark Spiriverpalunulata
2.KeytotheFinnishspecies
5a Male: Middle femora with usually 2
ofTherevidae
anteroventralbristles(Fig.2)
Female: Erect hairs on tergites 5–8 black
The following key covers all the 17 Finnish Acrosatheannulata
Therevidae species and six additional species 5b Male: Middle femora usually without
(listedwithinbrackets)thathavebeenfoundfrom anteroventralbristles
Scandinavia,RussiaorBalticcountries.Thiskey Female: Erect hairs on tergites 5–8 white
isbasedonourstudiesandliterature(Lyneborg& [Acrosathebaltica]
Spitzer 1974, Stubbs & Drake 2001, Zaitsev 6a Males 7
1988). 6b Females 11
7a Frons broader than anterior ocellus (Fig.
1a First segment of antennae thicker than the 3A). Abdomen silvery pollinose or black
pedicelandflagellum(Fig.1A) withsilverypattern 8
Dialineuraanilis 7b Frons narrower than anterior ocellus (Fig.
1b Allsegmentsofantennaeequallythick(Fig. 3B).Abdomensilverypollinose 9
1B) 2 8a Halteres black. Abdomen silvery pollinose
2a Facehairy 3 Dichoglenanigripennis
2b Facebare 6 8b Halteres yellow. Abdomen black, tergites
3a Male:Tergitessilverypollinoseandthehairs withweaksilverytriangles
onabdomensilverywhite Pandiviriliaeximia
Female:Fronswithoutcallus 4 9a Femoracompletelyblackfrombasetoapex
3b Male:Tergiteswithoutpollentofullydusted Psilocephalaimberbis
with dirty yellow or grey pollen (usually 9b Femorawithyellowapex 10
withadarkanteriorandlighterposteriorre- 10a Tip of aedeagus straight (Fig. 4A)
gion),hairsonabdomenmixeddark(black [Cliorismiaardea]
to brownish black) and light (yellow to 10b Tip of aedeagus S-shaped (Fig. 4B)
white) [Cliorismiarustica]
48 Haarto&Winqvist (cid:127) ENTOMOL.FENNICAVol.17
Fig.6.Thehindfemora
inposteriorviewof
Therevainornatamale.
Fig.5.Thetipofaedeagusinlateralview.(A)Therevacinifera,(B)T.
fulva,(C)T.inornata,(D)T.plebejaand(E)T.strigatamales.
Fig.8.Thehindfemorainanteriorviewof(A)Thereva
inornataand(B)T.nobilitatamales.
Fig.7.Themesonotumof
Thereva.
11a Femoracompletelyblackfrombasetoapex 5b The basal part of hind femora without
12 posteroventralbristles 10
11b Femorawithyellowapex 6a 2pairsofdorsocentralbristles(Fig.6).The
[C.ardeaandC.rustica] basal part of hind femora with 3–4
12a Tibiae and tarsi as dark as femora. Wing posteroventralbristles(Fig.7).Theantero-
membranewithbrownishborderadjacentto ventral bristles of the hind femora usually
wingveins Dichoglenanigripennis uniserial (Fig. 8A). Tip of aedeagus long
12b Tibiaeandtarsiyellowish,lighterincontrast curved(Fig.5C) T.inornata
tofemora.Wingmembranewithoutbrown- 6b 1pairofdorsocentralbristles.Thebasalpart
ishborderadjacenttowingveins 13 ofhindfemorawith1–3posteroventralbris-
13a Wingmembraneyellowbasally.Largespe- tles. Hind femora with additional bristles
cies(12–18mm) Pandiviriliaeximia outsidethenormalanteroventralrow(asin
13b Wing membrane completely transparent. Fig.8B) 7
Smallspecies(8–10mm) 7a Anterior part of tergites 4–5 with narrow
Psilocephalaimberbis darkband(morethanhalfthelateralpartof
tergites4–5dustedwithgreypollen) 8
GenusThereva 7b Anteriorpartoftergites4–5withbroaddark
band(onlyhalfthelateralpartoftergites4–5
1a Males 2 dustedwithgreypollen) 9
1b Females 14 8a Tergite 6 fully dusted with greyish pollen
2a All tergites light anteriorly, tergites com- (darkanteriortransversebandabsent).Wing
pletelydustedwithdirtyyelloworgreypol- membrane greyish, veins light brown and
len 3 crossveins weakly darkened. Hairs on the
2b Anteriorregionofatleasttergites2–5dark 4 lower part of the occiput and parafacial
3a Knob of halteres brownish black. Tip of mixedwithwhiteandblack T.unica
aedeagusshort(Fig.5A) T.cinifera 8b Tergite 6 incompletely dusted with greyish
3b Knob of halteres yellowish brown. Tip of pollen (dark anterior transverse band pres-
aedeaguslong(Fig.5B) [T.fulva] ent). Wing membrane whitish, veins dark
4a Alltergitesglossyblack [T.atripes] brownandcrossveinsintensivelydarkened.
4b Atleastpartofthetergitesmatt 5 Hairs on the lower part of the occiput and
5a At least one posteroventral bristle in the parafacialwhite [T.marginula]
basalpartofthehindfemora(Fig.6) 6 9a Mesonotumgreyishbrownandusuallywith
ENTOMOL.FENNICAVol.17 (cid:127) FinnishTherevidae 49
acleardarkbrowncentralline.Hairsonter- rowtransversebandordividedintotwosep-
gite1completelyblackordarkbrown.Tipof aratecalli 15
aedeagusshort(Fig.5D) T.plebeja 14b Onewide,usuallylarge,shinyblackfrontal
9b Mesonotumbluishgray andatmostwitha callus 16
diffuse dark central line. Hairs on tergite 1 15a Frontalcallusanarrowtransversebandthat
greyoryellowishmedially.Tipofaedeagus is sometimes divided medially (Fig. 9A).
long(Fig.5E) T.strigata Anteroventral bristles of the hind femora
10a Hairs on scutellum sparse and completely uniserial(asinFig.8A) T.valida
black. Hairs on abdomen predominantly 15b Frontalcallusclearlyseparatedontwoparts
black. Usually 1 dorsocentral bristle. Front (Fig.9B).Anteroventralbristlesofthehind
femoraanteroventrallyusuallywithoutbris- femora nearly uniserial, but irregularly ar-
tles T.valida rangedtowardsbase(asinFig.8B)
10b Hairsonscutellummixedyellowandblack. T.unica
Hairsonabdomenyellowlaterallyandblack 16a All tergites light anteriorly, tergites com-
dorsally 11 pletelydustedwithdirtyyelloworgreypol-
10c Hairs on scutellum and abdomen almost len 17
completelywhite 12 16b Anteriorregionofatleasttergites2–5dark
11a Anteroventral bristles of the hind femora 18
multiserial(somebristlesoutsidethenormal 17a Knob ofhalteres blackish. Tergite7 dusted
anteroventral row) (Fig. 8B). Hairs on with grey pollen. The frontal callus sepa-
scutellum not exceptionally dense and ratedfromtheanteriorocellus(Fig.9C)
mixed yellowish and black. Usually 1 T.cinifera
dorsocentral bristle. Front femorawith 1–4 17b Knobofhalteresyellowish.Tergite7glossy
anteroventralbristles T.nobilitata blackandonlylaterallygreypollinose.The
11b Anteroventral bristles of hind femora frontalcallusextendstotheanteriorocellus
uniserial(asinFig.8A).Hairsonscutellum (Fig.9D) [T.fulva]
dense and almost completely yellow. 2 18a The frontal callus extends dorsally around
dorsocentralbristles.Frontfemorawith2–7 theocellartubercle(Fig.9E) 19
anteroventralbristles T.handlirschi 18b Thefrontalcallusextendsdorsallyatmostto
12a 2–3 pairs of dorsocentral bristles (Fig. 7). theanteriorocellus 21
Wing veins narrowly bordered by dark 19a Tibiaeblack.Wingmembranedark
membrane. Front femora without [T.atripes]
anteroventral bristles. Mesonotum with in- 19b Tibiaeyellowish.Wingmembranewithdark
distinctlongitudinalstripes T.fuscinervis areasonlyadjacenttowingveins,predomi-
12b 1 pair of dorsocentral bristles. Wing veins nantlycleartotranslucentwhitishgrey 20
not bordered by dark membrane. Front 20a 2–3 dorsocentral bristles (Fig. 7). Wing
femora with or without anteroventral bris- veinsnarrowlyborderedbydarkmembrane.
tles. Mesonotum with distinct or indistinct FronsandfrontalcallusnarrowerthaninT.
longitudinalstripes 13 lanata T.fuscinervis
13a Front tibia longer than front femora. Head 20b 1 dorsocentral bristle. Wing veins not bor-
(in dorsal view) as broad as mesonotum. deredbydarkmembrane.Fronsandfrontal
Front femora with anteroventral bristles. calluswiderthaninT.fuscinervis(Fig.9E)
Mesonotum with distinct light longitudinal T.lanata
stripes T.microcephala 21a Anteriorpartoftergites2–5withdarkband
13b Fronttibiaaslongasfrontfemora.Head(in extendingmediallytoposterioredge(poste-
dorsalview)broaderthanmesonotum.Front rior of tergites 2–4 with broken or nearly
femora without anteroventral bristles. brokenbandofgreypollen).Frontalcallusin
Mesonotum with indistinct light longitudi- Fig.9F T.microcephala
nalstripes T.lanata 21b Anteriorpartoftergites2–5withdarkband
14a Shinyblackfrontalcallusformingonenar- extending medially near to posterior edge
50 Haarto&Winqvist (cid:127) ENTOMOL.FENNICAVol.17
Fig.9.Thefrontalcal-
lusof(A)Thereva
valida,(B)T.unica,(C)
T.cinifera,(D)T.fulva,
(E)T.lanata,(F)T.
microcephala,(G)T.
plebeja,(H)T.strigata,
(I)T.nobilitata,(J)T.
inornataand(K)T.
handlirschifemales.
Fig.10.Thetipof
ovipositorin
posterolateral
view(A)Thereva
plebejaand(B)T.
strigatafemales.
(posterioroftergites2–4withcompleteband row)(asinFig.8B).Frontalcallusnarrowly
ofgreypollen) 22 separatedfromanteriorocellus.Wingmem-
22a Frontalcallusextendslaterallytoeyemargin branewhitish,veinsdarkbrownandcross-
23 veinsborderedbydarkmembrane.Tergite3
22b Frontalcallusseparatedfromeyemarginby without contrasting line between anterior
amattarea 24 darkbrownishpartandposteriorgreyishpart
23a Spines on the tip of ovipositor broad and ofthetergite [T.marginula]
blunt(Fig.10A).Mesonotumdark,brown- 24c Knob of halteres blackish. Anteroventral
ish grey with distinct light longitudinal bristles of hind femora uniserial (as in Fig.
stripes.FrontalcallusinFig.9G T.plebeja 8A). Frontal callus separated from or ex-
23b Spinesonthetipofovipositorslender(Fig. tends to anterior ocellus. Wing membrane
10B). Mesonotum light, bluish grey with greyish brown, veins light brown and
distinct light longitudinal stripes. Frontal crossveinsnotborderedbydarkmembrane.
callusinFig.9H T.strigata Tergite3withcontrastinglinebetweenante-
24a Knobofhalteresyellowishbrown.Antero- riorbroadblackishpartandposteriorgreyish
ventralbristlesofthehindfemoramultiserial partofthetergite 25
(some bristles outside the normal antero- 25a Hairsonscutellummixedblackandyellow-
ventral row) (as in Fig. 8B). Frontal callus ish. Frontal callus separated from the ante-
separated from anterior ocellus (Fig. 9I). riorocellus(Fig.9J) T.inornata
Wingmembranegreyishbrown,veinslight 25b Hairsonscutellumyellow.Frontalcallusex-
brownandcrossveinsnotborderedbydark tendstotheanteriorocellus(Fig.9K)
membrane.Tergite3withoutcontrastingline T.handlirschi
betweenanteriornarrowdarkbrownishpart
andposteriorgreyishpartofthetergite 3.Faunisticcommentsand
T.nobilitata theevaluationofthreatenedspecies
24b Knob of halteres blackish. Anteroventral
bristlesofthehindfemoramultiserial(some The following faunistic comments are based on
bristles outside the normal anteroventral checkingtheFinnishmuseumcollections(Finn-
ENTOMOL.FENNICAVol.17 (cid:127) FinnishTherevidae 51
Fig.11.TheFinnishbiogeographical Fig.13.ThemapwithFinnishvegeta-
provincesandtheircodes.Al=Alandia, tionzones.(1a)Hemiboreal,ÅlandIs-
Ab=Regioaboensis,N=Nylandia,Ka lands,(1b)Hemiboreal,Southwestern
=Kareliaaustralis,St=Satakunda,Ta coast,(2a)Southernboreal,South-
=Tavastiaaustralis,Sa=Savoniaaus- westerndistrict,(2b)Southernboreal,
tralis,Kl=Karelialadogensis,Oa= Finnishlakedistrict,(2c)Southernbo-
Ostrobottniaaustralis,Tb=Tavastia real,CoastofSatakunda,(2d)Southern
borealis,Sb=Savoniaborealis,Kb= boreal,CoastofOstrobothnia,(3a)Mid-
Kareliaborealis,Om=Ostrobottniame- dleboreal,Ostrobothnia,(3b)Middle
dia,Ok=Ostrobottniakajanensis,Oba boreal,Kainuudistrict,(3c)Middlebo-
=Ostrobottniaborealisparsaustralis, real,TriangleofLapland,(4a)Northern
Obb=Ostrobottniaborealisparsbore- boreal,Koillismaadistrict,(4b)Northern
alis,Ks=Regiokuusamoensis,Lkoc= boreal,SouthernLapland,(4c)North-
Lapponiakemensisparsoccidentalis, ernboreal,ForestLaplandand(4d)
Lkor=Lapponiakemensispars Northernboreal,MountainLapland.
orientalis,Le=Lapponiaenontekiensis,
Li=Lapponiainarensis.
Table1.Thecategoryintheevaluationofthreatenedspeciesandthecorrespondingnumberofknownlocations,
followingRassietal.(2001).
Category Meaning Numberofpopulation
locations
CR Criticallyendangered Extremelyhighriskofextinctioninthewild 1
EN Endangered Veryhighriskofextinctioninthewild 2
VU Vulnerable Highriskofextinctioninthewild 3–5
NT Nearthreatened Closetoqualifyingfororneartobecomevulnerable 6–25
LC Leastconcern Commonandabundantorhassteadypopulations >25
52 Haarto&Winqvist (cid:127) ENTOMOL.FENNICAVol.17
Fig.12.DistributionmapsoftheFinnishspecies(A)A.annulata,(B)D.anilis,(C)D.nigripennis,(D)P.eximia,
(E)P.imberbis,(F)S.lunulata,(G)T.cinifera,(H)T.fuscinervis,(I)T.handlirschi,(J)T.inornata,(K)T.lanata,(L)
T.microcephala,(M)T.nobilitata,(N)T.plebeja,(O)T.strigata,(P)T.unicaand(Q)T.valida.
ish Museum of Natural History in Helsinki species,andmanyotherinsects,iscriterionD,or
(FMNH), Zoological Museum of University of “populationrestricted”.CriterionDis,however,
Turku (MZT), Natural History Museum of acommoncategorybecauselimitedresourcesare
Forssa, Natural History Section of Museum of available in Finland to monitor populations of
KuopioandZoologicalMuseumofUniversityof threatenedinsectspecies.Becausecollectingac-
Oulu) as well as numerous private collections. tivitiesinFinlandwererelativelyinfrequentuntil
Therevidae specimens collected during various theturnofthecentury,lowercategoriesarealso
entomologicalprojectshavebeenidentifiedand preferred for species represented by few speci-
usedintheseevaluations. mens in collections. Category A, “reduction of
After the faunistic text for each species, we populationsize,”isusedforonespecies:Thereva
categorizeeachspeciesbasedonevaluationcrite- strigata. The categories in the evaluation of
riaforthreatenedspeciesapprovedbytheWorld threatenedspeciesareshowninTable1.Species
ConservationUnionin1994(Rassiet.al.2001) distributions (Fig. 12) were estimated using lo-
andlistgeographicalprovincesfromwhicheach calityrecordsanddistributionsofFinnishvegeta-
specieshasbeenrecorded(Fig.11).Themostfre- tionzones(Fig.13).
quently used category for Finnish Therevidae
ENTOMOL.FENNICAVol.17 (cid:127) FinnishTherevidae 53
Acrosatheannulata(Fabricius,1805) mostnorthernlocalitybeingKuusamo.Females
Aspeciescommonlyfoundondunesandinother aremorecommonlyfoundthanmales.Thisspe-
sandybiotopesthroughoutthecountry.Thisspe- ciesisassessedtothecategoryLCanddoesnot
ciesisassessedtothecategoryLCanddoesnot needmonitoring.Ab,N,Ka,St,Ta,Sa,Kl,Tb,Sb,
needmonitoring.Al,Ab,N,Ka,St,Ta,Sa,Kl,Oa, Ks.
Tb,Sb,Kb,Om,Ok,Oba,Obb,Ks,Lkoc,Li.
Psilocephalaimberbis(Fallén,1814)
[AcrosathebalticaAndersson,1994] Aspecies historically distributed evenly almost
Thisrecentlydescribedspeciesisfoundfromthe throughoutthecountry,buttherecordsofwhich
BalticIslandsinSweden.ItispossibletofindA. arepredominantlyold.Sincethereareonlythree
balticaondunesfromthesouthcoastofFinland. recordsmadeinthelatest30years,Ta:Tammela
ThemaleofA.balticacanbereliablydifferenti- (Mattila 1998), Ta: Ylöjärvi (Mattila 2001) and
atedfromA.annulataonlybygenitalicfeatures. Ta: Lammi (Ahlroth 2002), the species is as-
(Andersson1994). sessed to the category VU and the last known
populations and the possible new findings will
[Cliorismiaardea(Fabricius,1794)] needmonitoring.Ab,N,St,Ta,Sa,Kl,Oa,Tb,Sb,
The only specimens have been recorded from Kb,Om,Ok,Oba,Li.
Karelia,Russia.C.ardeaisthusdeletedfromthe
Finnishchecklist.ItispossibletofindC.ardea Spiriverpalunulata(Zetterstedt,1838)
from sandy riverbanks in southeastern Finland Atleastpredominantlyanorthernspeciesfound
neartheRussianborder. in sandy biotopes. The few Finnish museum
specimens of this species had been loaned by
[Cliorismiarustica(Panzer,1803)] DonaldWebb,whoreportedS.lunulatafromthe
The only specimens have been recorded from provinces Ks–Li in a letter. He also reported an
Karelia, Russia. C. rustica is thus deleted from olderrecordfromN:Lappohja,whichcouldbea
the Finnish checklist. Also this species can be labelling mistake. There are only two new re-
foundfromsandyriverbanksinsoutheasternFin- cords of this species, Li: Utsjoki (Haarto 1994)
landneartheRussianborder. andLkor:Savukoski(Bagge2003),butthecol-
lectingactivityhasbeenlowinnorthernFinland.
Dialineuraanilis(Linnaeus,1761) ThisspeciesisassessedtothecategoryVUand
Aspeciescommonlyfoundondunesandinother does not need active monitoring. (N,) Ks, Lkor,
sandybiotopesthroughoutthecountry.Thisspe- Li.
ciesisassessedtothecategoryLCanddoesnot
needmonitoring.Al,Ab,N,St,Ta,Sa,Kl,Oa,Tb, [Therevaatripes(Loew,1847)]
Sb,Kb,Om,Ok,Obb,Ks,Lkoc,Lkor,Li. Aneasternspeciesdistributedfromthesouthern
SiberiatotheSt.Petersburgarea(Zaitsev1988).
Dichoglenanigripennis(Ruthe,1831) It might be possible to find T. atripes from the
Ararespeciesofwhichonlysevenscatteredre- southeasternFinlandneartheRussianborder.
cords from various parts of the country are
known.Sincethereisonlyonerecordmadeinthe Therevacinifera(Meigen,1830)
recent years, Ok: Sotkamo (Söderman & Lei- Inadditiontotheoldknownpopulation,thereare
nonen2003),thespeciesisassessedtothecate- three new populations of this scarce species
goryENandtheknownpopulationandthepossi- found,Ab:Dragsfjärd(Clayhillsetal.1996),N:
blenewfindingswillneedactivemonitoring.Al, Hanko(Haarto1996)andN:Helsinki(Kahanpää
Ab,N,St,Kb,Ok,Oba. 2003).Alltheselocalitiesarefromthesouthwest-
ern coast. This species is probably connected
Pandiviriliaeximia(Meigen,1820) withtheBalticsandyshoresinFinland.Itisas-
Arathercommonspeciesfoundmostlyinmoist sessedtothecategoryVUandneedsmonitoring.
meadowsinthesouthernandcentralFinland,the Ab,N,St.
54 Haarto&Winqvist (cid:127) ENTOMOL.FENNICAVol.17
[TherevacircumscriptaLoew,1847] Therevamicrocephala(Loew,1847)
The specimens determined as T. circumscripta This species is distributed along the coast.
turnedouttobelongtothespeciesT.validaLoew. T.microcephalaisfoundinforestsintheCentral
T.circumscriptaisthusdeletedfromtheFinnish Europe(Keil2003)andalsoinFinlandthenew
checklist. recordsofthisspecieshavebeenmadeinmoist
forests.Despitethefewrecordsmade,thespecies
[TherevafulvaMeigen,1804] might thus be less vulnerable than many other
TherewasonespecimenmisidentifiedasT.fulva speciesinthegenus.Thisspeciesisassessedto
inthecollectionofFMNH.ThisisaCentralEu- the category NTand does not need monitoring.
ropeanspeciesdistributednorthtotheSt.Peters- Al,Ab,N,Om.
burgarea(Zaitsev1988).Itmightbepossibleto
findT.fulvafromthesouthcoastofFinland. Therevanobilitata(Fabricius,1775)
Aspecies historically thought to be common in
TherevafuscinervisZetterstedt,1838 Finland(Frey1911)butithasoftenbeenmixed
Arathercommonlyfoundspeciespredominantly withT.handlirschi(Kroeber).Thereareonlyfour
inthenorthernFinland,buttherearetwospeci- certain records from Finland, all from dry or
mensfromAbintheMZT,whichwerecollected sandybiotopesnearthecoast:Al:Kökar(Hellén),
by Lahtiperä in the 1950’s. These southern re- Ab: Korppoo (Panelius 1961), Ab: Dragsfjärd
cordsareprobablylabellingmistakes.Thisspe- (Haarto1994),Om:Lohtaja(Ahola2004).This
ciesisassessedtothecategoryLCanddoesnot speciesisassessedtothecategoryVU.Thelast
needmonitoring.(Ab,)Obb,Ks,Lkoc,Le,Li. knownpopulationsandthepossiblenewfindings
willneedmonitoring.Al,Ab,Om.
TherevahandlirschiKroeber,1912
Oneofthecommonestspeciesofthegenusdis- Therevaplebeja(Linnaeus,1758)
tributed in the southern Finland. This species is A dark Thereva species distributed evenly and
assessed to the category LC and does not need commonly in the southern and central parts of
monitoring.Al,Ab,N,Ka,St,Ta,Sa,Oa. Finland.Thisspeciesisassessedtothecategory
LCanddoesnotneedmonitoring.Al,Ab,N,Ka,
TherevainornataVerrall,1909 St,Ta,Sa,Kl,Oa,Tb,Om,Ok.
Arathercommonspeciesinthesouthernandcen-
tralFinland,butmay becommonestintheeast. Therevastrigata(Fabricius,1794)
This species occurs mainly in sandy biotopes. A very rare species connected with sandy
Thisspeciesisassessed to thecategory LCand biotopesandknownonly fromthesouth.There
doesnotneedmonitoring.Al,Ab,N,St,Ta,Sa,Kl, arenorecordsofthisspeciesaftertheyear1943.
Tb,Sb,Kb,Ok. It is possible that T. strigata is actually extinct
fromFinland,butbecauseofthelimitedcollec-
TherevalanataZetterstedt,1838 tionactivityitmightbeoverlooked.Atthisstage
One of the commonest species of the genus in itisassessedtothecategoryCR.Ifapopulation
Finland distributed especially abundant in the of T. strigata is found again fromFinland, then
north. This species occurs mainly in sandy the population will need active monitoring. Al,
biotopes.Thisspeciesisassessedtothecategory Ab,N.
LCanddoesnotneedmonitoring.Ab,N,Ka,Ta,
Sa,Kl,Tb,Sb,Kb,Om,Ok,Oba,Obb,Ks,Lkoc, Therevaunica(Harris,1780)
Lkor,Le,Li. InadditiontotheoldknownpopulationinHanko
area, N: Tvärminne, there are two new popula-
[TherevamarginulaMeigen,1820] tions found, Ok: Sotkamo (Söderman & Lei-
ASouthandCentralEuropeanspeciesdistributed nonen 2004) and Om: Raahe (Varpenius 2004).
northtothesouthernSweden.Itmightbepossi- Thisspeciesmightbeconnectedwithdry heath
bletofindT.marginulafromthesouthcoastof forestsandsandybiotopes.T.unicaisassessedto
Finland. thecategoryVUandthelastknownpopulations
ENTOMOL.FENNICAVol.17 (cid:127) FinnishTherevidae 55
andthepossiblenewfindingswillneedmonitor- torumFenniae,VI,Diptera.—HelsinginHyönteis-
ing.N,Om,Ok. vaihtoyhdistys:1–63.
Hackman,W.1980:AchecklistoftheFinnishDipteraI.
Nematocera and Brachycera (s.str.). — Notulae
TherevavalidaLoew,1847
Entomologicae60:17–48.
Thisisarathercommonspeciesinthesouthern Kahanpää,J,&Winqvist,K.2005:Check-listofFinnish
and central Finland. This species is assessed to flies:familiesXylophagidae–Microphoridae.—Sahl-
the category LC and does not need monitoring. bergia10(1):10–27.
Keil, P. 2003: Habitat and microhabitat preferences of
Al,Ab,N,St,Ta,Sa,Kl,Kb,Om,Oba.
mountainTherevidae(Diptera)andecologicaloutline
of Czech Therevidae. — BSc thesis, University of
Acknowledgements.WearegratefultoKevinHolstonfor SouthBohemia.
adviceandhelpinformulatingthelanguageofthekeyand Lyneborg,L.&Spitzer,K.1974:TheCzechoslovakspe-
assessingthebiologicalstatusofTherevidaespecies.We ciesofTherevaLatr.(Therevidae,Diptera)withthe
alsothankTheFinnishEnvironmentInstituteforfinancing descriptionofanewspeciesfromHungaryandAus-
thisstudyintheautumns2002–2004. tria.—ActaSci.Nat.Mus.Bohem.Merid.14:13–42.
Rassi,P.,Alanen,A.,Kanerva,T.&Mannerkoski,I.(eds.)
2001:Suomenlajienuhanalaisuus2000.—TheFinn-
ishMinistryofEnvironmentandtheFinnishEnviron-
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