A review of Australian long-horned caddisflies in the Oecetis pechana-group (Trichoptera: Leptoceridae), with descriptions of thirteen new species

2006·15.1 MB·English

by  Alice Wells

MemoirsofMuseumVictoria63(2): 107-128(2006)
ISSN 1447-2546(Print) 1447-2554(On-line)
http://www.museum.vic.gov.au/memoirs/index.asp
A
review ofAustralian long-horned caddisflies in the Oecetispechana-group
(Trichoptera: Leptoceridae), with descriptions ofthirteen new species
AliceWells
AustralianBiologicalResourcesStudy,DepartmentoftheEnvironmentandHeritage,GPOBox787,CanberraACT2601,
Australia([email protected])
Abstract Wells,A.2006.AreviewofAustralianlong-hornedcaddisfliesintheOecetispechana-group(Trichoptera:Leptoceridae),
withdescriptionsofthirteennewspecies.MemoirsofMuseumVictoria63(2): 107-128.
This final paperin aseries reviewingAustralian members ofthe long-horned caddisfly genus Oecetis McLachlan
(Trichoptera:Leptoceridae)dealswith21 species, 13ofthemnew,andallassignedheretothepechana-growp,so-named
forthe most common and widespread ofAustralian Oecetis species. This group is diagnosed as having fork 1 in the
forewingsessileand,inthemale,scalepatchesontheforewingandasingleinternalparamereinthephallus,althoughin
severalspeciesoneorotherofthesemalefeaturesisabsent.KeysaregiventotheOecetisspeciesgroupsrecognisedin
Australiaandto species inthepechana-group. Establishedpechana-group species are diagnosed andnew species are
described.MalegenitalicfeaturesareillustratedforallspeciessaveO.luridaKimminswhichwasdescribedfromafemale
andisprobablyadoubtfulname.AhomonymcreatedinthenameO.dilataWells,2004isreplacedwiththenameOecetis
kimberleyensisnom. nov.,andOecetiscepaformaWells,2004is synonymisedwiththewidespreadOriental-Australian
O.hemerobioidesMcLachlan,1866.Seventy-fourOecetisspeciesarenowrecognisedintheAustralianfauna.
Keywords Taxonomy,Trichoptera,Leptoceridae,Oecetispechana-group,newspecies,Australia
Contents Oecetissearicasp. nov. 123
Oecetisadasp. nov. 123
Introduction 107 OecetisgilvaNeboiss, 1977 127
Methods 108 OecetisluridaKimmins, 1953 128
KeytomalesofOecetis species groupsinAustralia 108 Nomennovumandnew synonymy 128
Key to males of the Oecetis pechana species group in Acknowledgements 128
Australia 109 References 128
Australianpechana-group species
OecetispechanaMosely, 1953 110 Introduction
OecetiswalpolicaNeboiss, 1982 110
OecetisumbraNeboiss, 1977 110 AmongAustralianrepresentativesofthelong-hornedcaddisfly
Oecetismagelensissp. nov. 110 genus Oecetis McLachlan (Trichoptera: Leptoceridae), a
Oecetissuterisp. nov. Ill persistent taxonomic problem has been the precise
Oecetisradonensissp. nov. 116 determination of the scope of the species known as
Oecetishumphreyisp. nov. 116 OecetispechanaMosely, 1953.Thenamehasbeenappliedto
Oecetiskateaesp. nov. 116 almostall Oecetis specimens having patches ofscales onthe
Oecetisgeniculatasp. nov. 117 male forewing, collected Australia-wide, including the water
Oecetislituasp. nov. 117 bodies and even stock watering troughs of the arid inland.
Oecetisjenniaesp.nov. 120 However, close inspection of males of many of the putative
Oecetismouldsisp. nov. 120 O.pechana specimens reveals arange offorms sharing all or
Oecetistheischingerisp. nov. 121 someofasuiteofcharacterstates. Herethe Oecetispechana-
OecetisaustralisBanks, 1920 121 growp is recognised for a set of 21 species, 13 of which are
Oecetisquadrulasp. nov. 121 newlydescribed,andisdefinedtoincludeanumberofspecies
OecetisbuitenzorgensisUlmer, 1951 ‘-122 that lack scales on the male forewing, but share other
OecetisburtoniNeboiss, 1979 123 synapomorphies.
-
108 AliceWells
Oecetispechanawasdescribedoriginallyfromthesouth- Australia. The key provided by Wells, 2004 to distinguish
west ofWesternAustralia, and subsequently was redescribed males of the five Oecetis groups recognised forAustralia is
and figured by Neboiss, 1977. Neboiss illustrated his work reproducedherewithslightmodifications,andakeytomales
withnewfiguresofO.pechanafromTasmania,showingakey ofpecliana-growpspeciesisgiven.Thenamedilataappliedto
feature ofthe species: the very elongate phallus. Thisfeature anAustralian Oecetisspecies byWells, 2004,thus creating a
is also seenin anewly recognised species, O. suteri sp. nov., homonym, is replaced; and the name Oecetis cepaforma
but is absent in superficially similar specimens that are Wells, made available in the same work is here suppressed
recognised here as representing several distinct species. O. insynonymy.
pechanaas definedhereisthemostcommonandwidespread
Australianspeciesinthegenus Oecetis.Adultsvarygreatlyin Methods
size,forewinglengthofthoseinthenorthernregionsbeingas
little as halfthatofsouthernforms. Such adifference in size Material examined is lodged in the collections of Museum
range probably reflects differences in growth rates, the life Victoria, Melbourne (NMV), the Australian National Insect
cyclesbeingcompletedfarmorerapidlyinthewarmnorthern Collection, Canberra (ANIC), the Queensland Museum,
waters than in the cooler southern waters. In support ofthis Brisbane (QM) and the Northern Territory Museum ofArts
contention, larger-sized adults were collected inthe southern and Sciences, Darwin (NTM). Other abbreviations used here
MtLoftyRangesofSouthAustralia,whereamainlate-spring are BMNH (The Natural History Museum, London, UK);
emergenceofadultsisfollowedbylownumbersofspecimens MCZ(MuseumofComparativeZoology, HarvardUniversity,
throughout summer, and none in the cool winter months. In Cambridge, Massachusetts, USA); ARR is used for the
contrast, samples from the north of the Northern Territory Alligator Rivers region, NT; OSS for the Office of the
containonlysmall-sizedadultsand,throughout14consecutive SupervisingScientist,Darwin(previouslyatJabiru);andWTH
months oflighttrap sampling onthe Magela Creek atJabiru is an NMV code forthe WetTropics Heritage area ofnorth-
(1991-1992), Oecetis pechana adults were collected easternQueensland. Inthelocalitydataincludedwiththelists
regularly. of material examined, the Australian political states are
Oecetispechana is often abundantin lentic waterbodies abbreviated as follows: NSW (New South Wales); NT
suchasfarmdams andlakes,thelarvaeintheirtubularsand- (NorthernTerritory); Qld(Queensland); SA(SouthAustralia);
WA
grain cases probably scavenging on organic material on the Tas. (Tasmania) Vic. (Victoria); and (WesternAustralia).
;
substrate.Similarly,allotherpechana-groupspeciesforwhich Many ofthe scaly-winged species in this group are very
larvae have been associated, have cases built ofsand grains, difficulttodistinguishwithoutdissectionofthemaleabdomen
includingOecetisgilvaNeboiss,1977.Thisspeciesalsooccurs orclearingofthemalegenitaliatodeterminethelengthofthe
inlargepopulationsinsomefarmdamsintheAdelaideHills, phallus andsizeandshapeofthe singleinternalparamere.
South Australia, and has been taken in large numbers from
severallakesinVictoria.OecetisgilvaasdescribedbyNeboiss Key to males of Oecetis species groups in Australia
lacks scales onthe maleforewing, although conforming with [ModifiedfromWells,2004]
members of the pechana-group in other respects. Indeed,
membership ofthis group is confirmed by the fact that light 1. Abdominal tergite VIII sculptured, expanded and
trap collections referable to O. gilva taken at two Victorian extendeddistally,formingshieldoverterminalabdominal
lakes include males that have scales on the forewing. Quite segmentsandgenitalia reticulata-group(seeNeboiss,
conceivably, these are simply variants of O. gilva, or even 1989: fig. 2)
—
hybrids between O. pechana and O. gilva. For the present, AbdominaltergiteVIIIunmodified 2
theyareacceptedas O.gilva. 2. Wings with veins strongly pronounced, fork 1 without a
Thus, the Oecetispechana-group is defined by a suite of footstalk(sessile)
characterstates, notall sharedby allmembers: forewingfork longiterga-group(seeWells,2004: figs91,94)
—
1 without a footstalk, usually with cross veins, forks and Wingswithveinsnotstronglypronounced,fork 1 withor
anastomoses markedby darkened membrane and hairs; tibial withoutfootstalk 3
spur formula 1,2,2; in the male, forewing usually with scale 3. Phallussimple,lackingparameres
patches, phallus usually with a single internal spine or laustra-group(seeWells,2004: figs 18,46,59)
—
paramere,neverwithtwo,abdomenusuallywithtergitesII-IV Phallus with 1 ormore internal orexternal parameres or
darkly sclerotised, and genitalia usually with a small setae spines 4
lined pouch on inner dorsal side ofinferior appendages; and 4. Forewingfork1sessile,winglaminaoftenbearingpatches
larvae with tubular to conical or cornucopia-shaped cases ofscales(androconia)(fig. 1);phallususuallywithasingle
constructed of sand grains held together by silk secretion. internal paramere orspine, neverwithmorethan 1 spine
Species ofOecetisinthefaunaofNewZealand, New Guinea associated with the phallus (e.g. figs 3, 7, 8)
and Java also share the synapomorphies of these pechana- pechana-group(seebelow)
—
groupmembers. Forewing fork 1 stalked, wing never bearing patches of
Thisisthefinalworkinaseriesofpapers(Neboiss, 1989; scales;phalluswith 1 ormoreexternalparameres (spines
Wells,2000,2004)revisingAustralianspeciesofOecetis,and ofthephallotheca)
raises to 74 the number of species recorded in this genus in complexa-growp(seeWells,2000: figs25,26-33)
Australian Oecetispechana-group 109
Key to males of the Oecetis pechana-species group in 12. Inferior appendages in ventral view stout throughout
Australia length, mesially gradually excavated from base, apices
[excludingO. luridaforwhichmalesarenotassociated] rounded(figs7,54) 13
—
Notasabove 15
1. Forewing with 1 or more patches of scales (androconia) 13. Phallus with sclerotised paramere equal to about 2-3
onlamina(figs 1,6) 2 timeslengthofabdominal segmentVIIF,^ 14
— Forewingwithoutscalesonlamina(figs38,39) 17 Phalluswithoutsclerotisedparamere(fig. 54)
2. Inferiorappendages inventralviewwithlengthlessthan O.gilva(part)
twicewidthatbase(figs 13,31) 3 14. Inferiorappendagesinventralviewdilatedlateralatabout
— Inferior appendages in ventral view with length about halflength, somewhatsinuousinappearance(fig.7)
O. walpolica
twicewidthatbase,orlonger(figs3,7, 17), 4 —
Inferior appendages in ventral view swollen basally,
3. Inferiorappendagesinventralviewmoreorlessquadrate;
gradually tapered towards apices (Neboiss, 1977: fig.
phallus in lateral view with paramere about 2-3 times 771) O. umbra
length of abdominal segment VIII, strongly arched 15. Inferior appendages in ventral view stout basally, sharply
— dorsally(figs31,32) O.jenniae excavated on mesial margin at about two-thirds length,
Inferiorappendagesinventralviewmoreorlessquadrate; apices rounded; sclerotised paramere of phallus about
phallus about 3-4 times length of abdominal segment — lengthof2abdominal segments(figs9, 10).O.magelensis
VIII,almoststraight(figs 13, 15) suteri Notas above 16
4. Inferiorappendagesinventralviewabruptlyangledmeso- 16. Inferiorappendagesaboutequalwidththroughoutlength,
dorsally at abouttwo-thirds length, ratherthan smoothly sinuous in lateral view, apices rounded to truncate (figs
— curved,apicestruncate(fig. 25) O.geniculata 16, 17) , , O. radonensis
Inferiorappendagesnotasabove 5 Inferiorappendagesaboutequalwidthformostoflength,
5. Pre-analappendageswithlengthabout3timeswidth(figs distallytaperedtoacuteconvergentapices(figs 19,20)
52,53) O. ada O. humphreyi
— Pre-anal appendages withlengthless than3 times width 17. Forewing with distinctly spotty pattern; inferior
appendages close-pressed meso-ventrally for proximal
(figs34,36,44,45) 6
6. Inferior appendages in ventral view with a triangular half,mesialmarginexcavatedindistalhalf;phallusabout
lengthof2abdominalsegments,withsclerotisedparamere
meso-basallobedorsally(figs33,35) 7
— strongly arched dorsally, down-turned in distal section,
Inferiorappendageswithoutalobeasabove 8
7. Inferior appendages in ventral view with the triangular — Fapoirceawlilyngacuwtieth(foiugts27d,is2t8i)nctly spotty pattern, alO.thloiutguha
meso-basaldorsallobeprominentandproximaltoasharply usually with crossveins and vein forks and anastomoses
triangularapico-mesialangle(fig.35) O.theischingeri markedby darkmembrane andhair; inferiorappendages
Inferior appendages in ventral view with the triangular not close-pressed formore than one-fifth length; phallus
meso-basaldorsallobelessprominentandwithoutasharply usually shorter than length of 2 abdominal segments,
triangularapico-mesialangle(fig.33) O.mouldsi sclerotised paramere strongly reduced, absent or very
8. Inferiorappendagesinventralviewwithlengthmorethan slender 18
3 times basal width; phallus short, about length of 1 18. Inferior appendages with length longerthan basal width
abdominalsegment,sclerotisedparamereslender(figs43, (fig. 54) O.gilva(part)
—
45) O. buitenzorgensis Inferiorappendages withbasal width greaterthanlength
—
Notas above 9 (figs37,40,46) 19
9. Inferior appendages in ventral view fused mesially in 19. Inferior appendages in ventral view with apico-mesial
basalthird;inlateralviewwithlengthabout4timeswidth angles acute; phallus with sclerotised paramere finely
whip-like distally; a pair ofmembranous lobes flanking
— N(foitgsa4s9,ab5o0v)e O. searic1a0 — abdominal segmentX(fig.37) O. australis
Notasabove 20
10. Inferior appendages in ventral view stout, mesial margin 20. Abdominal segment X in lateral view with an apically
excavatedindistalhalf;phallusgreaterthan4timeslength
acute ventral process at about half length; inferior
— ofabdominal segmentVIII(fig.3) O.pechana appendages in lateral view tapered toward apex (figs 40,
Notasabove 11 42); antennal segmentwithbrushoflong setae onleading
11. Inferiorappendagesinventralviewstoutatbase,gradually edges O.quadrula
excavatedtowardsapex,slenderdistally;phallusinlateral — Abdominal segment X in lateral view expandedtowards
viewwithsclerotisedparamerearchedventrally(figs22- apex, lacking a ventral process; inferior appendages in
— 24) O. kateae lateral view rod-shaped (fig. 48); each antennal segment
Notasabove 12 withsetaeallaboutequallength O. burtoni
110 AliceWells
OecetispechanaMosely halflength ofthat of O.pechana and strongly arched dorsally.
Also resembling O. kateae sp. nov. in general form, but the
Figures 1-6,56
phallusofkateaeislessstronglycurvedandarchesventrally,and
OecetispechanaMoselyinMoselyandKimmins, 1953:302,figs theinferiorappendagesinventral view aremorewidely curved
213-215. -Neboiss, 1977: 143,figs764-769. -Neboiss,1986: 267. andattenuateapically.Maleforewinglength5.7-10mm.
Material examined. Holotype. Male, Yanchep, WA, 31°32.9'S, Distribution. Distributed from south-western WA inland and
115°41.2'E(BMNH). northwardstothefarnorthofNT.
Other material: Some 240 samples from all states ofAustralia
wereexamined,incollectionsofNMV,ANIC,QM,NTM. Remarks. OecetiswalpolicaiseasilymistakenforO.pechana
Diagnosis. Male. Recognised by a combination of wing and,similarly,isfoundinwaterholesofthearidinland.
features, including scale patches, and the general form ofthe
genitalia with inferior appendages in ventral view stoutly OecetisumbraNeboiss
clasper-shaped,smoothlycurvedmesially,andbroadlyrounded Figure58
apically;abdominalsegmentXasimplemembranousplate;the
phalluslongandstraight,extendingthelengthof3-4abdominal Oecetis umbra Neboiss, 1977: 144, figs 770-773. —Neboiss,
1986: 268.
segments,andhavingtheparamerestoutanddarklysclerotised.
Maleforewing(fig. 1)length5.5-9.6mm. (NMHVolTo-t5y4p8e9.).Male,Tas.,Waldheim,CradleMountainNationalPark
Males ofclosely similar species differfrom O.pechana as
follows: O.walpolicahastheinferiorappendagesinlateralview Material examined. Tas.: 1 male. Lake Dobson, 20 Feb 1967,
tapered to narrowly rounded apex, phallus shorter, its length E.F. Riek (ANIC); numerous males, females, Franklin R., Roaring
equalling about 2 abdominal segments, and the paramere Creekjunction,1kmaboveGordonR.,8Jan1977,Coleman,Neboiss,
strongly arched dorsally; O. katae has inferior appendages in Allbrook(NMV); 1 male,GordonR., 1 kmaboveFirstSplit, 11 Jan
lateral view even more narrowly tapered and curved upwards, s19w7a7m,pConleeamraOnl,gNaebRo.,is1s9,kAlmlbarbooovke,SGwoaridnon(NR.MVJ)un;ct2iomna,le1s3,J1afnem1a9l7e7,,
phallus shorter, paramere arched ventrally; O. magelensis has NeboissandSwain(NMV);2males,2females.CavesCamp,NEof
the inferior appendages shallowly excavated mesially, phallus NewR. Lagoon, 2Jan 1979, S.F. McEvey(NMV);numerousmales,
shorter, about 2-3 abdominal segments in length; O. gilva females,southcoast.CaversCamp,NewR.Lagoon,3Jan 1979,S.F.
usually has no scales on the forewing, inferior appendages in McEvey(NMV).
lateral view attenuate apically, and phallus very short, about
lengthof1.5abdominalsegments,withoutparamere. Diagnosis. Male. Closely resembling O. pechana and O.
walpolica in general features such as scales on the wing and
Distribution.Australia-wide. clasper-shaped inferior appendages, but distinguished from
Remarks.Asdefinedhere,O.pechanaisdifficulttodistinguish both these species by shorter phallus with the paramere only
fromcloselysimilarspecies,sincethekeydiagnosticfeatureis slightly curved, and inferior appendages divergent apically,
thelengthofthemalephallus.Thisfeatureissurelybiologically ratherthanconvergent.
significant, acting as a reproductive isolating mechanism, Distribution. KnownonlyfromTas.
determiningmatingsuccess.Nevertheless,itdoesappearlikely
thathybridisationbetweenO.pechanaandotherspeciesoccurs, Remarks. Neboiss, 1977 compared this species to the New
andthismaybeconfirmedifmolecularstudies arecarriedout Zealand Oecetis unicolor McLachlan and Chatham I.
inthefuture. Oecetissuterisimilarlyhasthephallus elongate, O. chathamensis Tillyard and it certainly resembles those
but can easily be distinguished by the much reduced inferior speciesmorecloselythanitdoesAustralianspecies.
appendages. Oecetispechana is often common in both lentic
andloticsystems,whereitslarvaebuildtubecasesofsand. Oecetismagelensissp.nov.
Figures9-11,59
OecetiswalpolicaNeboiss
Material examined. Holotype. Male, NT,AlligatorR. region, Magela
Figures7,8,57 Creek,OSSSite009,12°42'S,132°57'E,17Jan1992,Wells(ANIC).
1986:Oe2c6e7t.is walpolicaNeboiss, 1982: 321, figs 123-125. —Neboiss, 1991P,aWrealtlypse(s.ANNITC:);254mmaalleess,,5AfReRma,leMsa,gAeRlRa,CrMeaegkelsaiteCr0e0e9k,a1t5RFuemb
Holotype.Male,FranklandR.,Circularpool,6kmNEofWalpole, pipeline, 18-19Feb 1991,P.Dostine(NMV).
WA(NMV:T-6596). Othermaterial.NT: 1male,MatarankaHS,RoperR.,25Jan1977,
M.S. and B.J. Moulds (NMV); 1 male, 1 female, 12°42'S, 132°57'E,
Materialexamined.Forty-fivesamples,mostfromWA,severalfrom KakaduNationalPark,MagelaCreek,OSSSite009,28-29Jan 1991,
NT. P.Dostine(NTM);2males, 12°42'S, 132°57'E,KakaduNationalPark,
Magela Creek, OSS Site 009, 15 Feb 1991, Wells (NTM); 3 males,
Diagnosis. Male. Closely resembling O.pechana, especially in ARR,MagelaCreekatRumpipeline,1-2Apr1991,P.Dostine(NMV);
formofthewings,shapeofinferiorappendagesinventralview, 3males,12°42'S,132°57'E,KakaduNationalPark,MagelaCreek,OSS
andpresenceofthebasi-dorsalpouchontheinferiorappendages. Site009, 1-2Apr 1991,P. Dostine(NMV);3 males, 1 female,Jabiru
Distinguishedfromthatspeciesbythemalegenitaliawithinferior TownLake,12°40'S,132°53'E,5Apr1991,WellsandWebber(NTM);
appendages attenuateapicallyinlateral view, andphallus about 6males,12°42'S,132°57'E,KakaduNationalPark,MagelaCreek,OSS
Australian Oecetispechana-group 111
Site 009, 24Apr 1991, Wells andWebber(NTM); 1 male, 1 female, Othermaterial.NT:2males,12°52’S,132°50’E,Koongarra, 15km
12°42'S, 132°57'E,AlligatorR.Region,MagelaCreek,OSS Site009, EofMtCahill, 15Nov 1972,J.C. Cardale(ANIC);numerousmales,
28-29Apr1991,RDostine(NTM);1male,1female,GregoryNational females,16°40’S,135°51’E,BessieSpring,8kmESEofCapeCrawford,
Park, Limestone Gorge, 25-26 Oct 1991, J. Webber(NTM); 1 male, 25Oct1975,J.C.Cardale(ANIC);1male,1female,16°40'S,135°51'E,
1 female, 12°42'S, 132°57'E, Kakadu National Park, Magela Creek, 8 km ESE of Cape Crawford, 26 Oct 1975, J.C. Cardale (ANWIC);
OSS Site 009, 3^1 Feb 1992, P. Dostine (NTM); 1 male, 12°42'S, 2males, 1 female, 16°32'S, 136°10'E,CattleCreek,54kmSby of
132°57'E, Kakadu National Park, Magela Creek, OSS Site 009, Borroloola,27Oct1975,J.C.Cardale(ANIC); 1male, 1female,SAR,
21-22Mar 1992,P.Dostine(NTM).WA: 2males,2females,Maggie 14Jun1988,P.Dostine,Site1(NTM);1male(headless),ARRS,Radon
Creek,3Feb 1978,J.E.Bishop(NMV);3males,MaggieCreek,90km Springs, 13-14Apr 1989, SuterandWells (NMV); 2 males. Kakadu
Kununurra-Wyndham,3Feb1978,J.E.Bishop(NMV); 1male,stream National Park, Baroalba Springs, 25 Apr 1991, Wells, Webber and
opposite Dead Horse Gap, Lake Argyle, 19 Feb 1977, J.E. Bishop Bickel(NTM);3 males,2females.BerrySprings,30Oct 1991,Wells
W
(NMV); 1 male, 4 females, Lily Creek Waterhole, 15 km of and Webber (NTM); 2 males, 12°42'S, 132°57'E, Kakadu National
RK.unWunuorfrKau,n2u2nuFrerba,19J7.7E,.JB.iEs.hBoips,h2o2p(FNebMV1)9;771m(aNlMeV,)1;fe1mamlael,e,DuOnrhdaRm. P2armka,leMsa,geslaameCrleoeckal,itOySaSndSitceol0l0e9c,to2r,8-32^91JFaenb1919929,2P.(DNoTsMt)i;ne2(NmaTlMe)s;,
atKununurraDam,22Feb1977,J.E.Bishop(NMV). LitchfieldNationalPark,WalkerCreek,18-19Apr1992,Wells(NTM).
Qld: 1male,LockerbieScrub,CapeYorkPeninsula,15Apr1975,M.S.
Diagnosis. Males resemble O.pechana and O. walpolica,the Moulds (NMV); 1 male. Cape York Peninsula, upper Jardine R.,
malegenitaliaappearingcloselysimilarinventralview,butare 11°ITS,142°35'E,13Oct1979,M.S.andB.J.Moulds(NMV);2males,
distinguished from the former by the shorter phallus with a samelocalityandcollectors, 17Oct1979(NMV); 14males,6females,
strongly arched paramere, and from both O. pechana and BertieCreek, 1 kmSEHeathlandsHS,4Feb 1992,D. Cartwrightand
vOi.eww,altphoelmiecsaibalymfaeartguirnesisolfitnheedipnrfoexriiomralalpypewnidtahgaesr:owinofvesnmtarlall AmS.aWlWee,HlelaEstlih(oltAaNnCIdrsCe)He;Sk,2u4mpaFslteerbse,a191m9f2je,umnaDcl.teiC,oantrrtiCwbarunitagarhlytCoarfnedBeeAkr.,tiWe6eFlCelrbsee(k1N,9M92V25,)0;Dm.1
setae, then excavated to form a small concavity; apically a Cartwright andA. Wells (NTM);4males,7females, Dulhunty R., at
clusterofshortsetae;inlateralviewthenarrowerdistalsection TelegraphCrossing, 10Feb 1992,D. CartwrightandA.Wells(NMV);
oftheinferiorappendagesisshorterandmorecloselyresembles 17males,7females,tributaryofBertieCreek,250mSWHeathlands
thatofO. suterisp.nov. HS,11Feb1992,D.CartwrightandA.Wells(ANIC,2malesonslides);
5males,3 females.GunshotCreekatTelegraphCrossing, 14-15Feb
Description. Male. Forewing slender, length 5.0-9.0 mm, with 1992,D.CartwrightandA.Wells(QM);1male,1female,samelocality
short hair on veins, dark spots at vein junctions formed by andcollectors, 17Feb 1992(QM);numerousmales,females.Gunshot
pigmented membrane and darkervestiture; and a single broad CreekatTelegraphCrossing,4-5Apr1992,M.Crossland(ANIC).WA:
patchofscales.Abdominal segmentsII-IVwithtergitesdarkly 1 male, 1 female,MillstreamCrossingPool,2Oct 1970,J.C. Cardale
scerotised, IX short, pale, slightly produced mid-dorsally, X a (ANIC);4males,DrysdaleR.,upperreaches,16°09’S,125°58'E,7Sep
simple, membranous plate, triangular distally. Genitalia (figs 1996,1.Edwards(NMV).
9-11). Pre-anal lobes length about 1.5 times width, apically Diagnosis. Alone in thepechana-growp, O. suteri lacks fork
rounded. Phallus membranous, length equal to 2-3 abdominal 1 intheposteriorwing;theforewingismoreroundedapically
segments,apico-ventralportionofphallothecasharplybeak-like thanmostspeciesinthisgroupandthescalepatchesnarrower.
and down-turned, paramere darkly sclerotised, in lateral view Otherwise it resembles O. pechana and O. magelensis
strongly arched dorsally. Inferior appendages stoutthroughout superficially,butinthemaleisdistinguishedfrombothbythe
length in ventral view, apically rounded, mesial margin lined inferior appendages broader than long in ventral view. Like
proximally with short setae, abruptly excavated at about two- O. pechana O. suteri has the phallus about the length of 4
,
thirds length, with a pouch meso-dorsally on basal section; in abdominalsegments.
lateralviewstout,withashort,roundedlobedorsally.
Description. Male. Wings narrowerthan in O.pechana, with
WA
Distribution. Foundinthenorthof andtheNT. darkmarkingsatcrossveins,anastomosesandatmarginalends
ofveins;vestitureshort;forewingwithanarrow,elongatepatch
Remarks. Oecetis magelensis is difficult to distinguish from ofscales, discoidal and thyridial cells long, narrow, discoidal
O. walpolica, but has the inferior appendages in lateral view cell extending distally beyond M-R, M-R distal to thyridial
withdistalnarrowersectionshorterandinventralviewtending cell; hindwingwithoutfork 1. Forewinglength,4.3-4.6 mm.
to converge, whereas in O. walpolicathe inferiorappendages AbdominaltergitesII-IVdarklysclerotised.Genitalia,seefigs
tendtoturnoutwardtowardapices. 12-15. Abdominal segment IX of moderate length, dorsally
with paired papillae apico-mesially. Abdominal segment X
Oecetissuterisp.nov. sub-triangular, short setae scattered apically. Inferior
Figures 12-15,60 appendagesbroadbasally,slightlyextendedlaterally,inlateral
view triangular; a rounded dorsal pouch present. Phallus
Materialexamined. Holotype.Male,HolmesJungleNT,7Jun 1991, elongate, about4timeslengthofabdominal segmentIX,with
HorakandWells(ANIC,onslide). along,almoststraightparamere.
Paratypes.NT:2males.KakaduNationalPark,BaroalbaSprings,
25Apr 1991,WellsandWebber(ANIC);2males, 12°42'S, 132°57'E, Distribution. Collected in WA from the Millstream and
KakaduNationalPark,MagelaCreek,OSSSite009,28-29Jan1992, Kimberleyregions,inNTfromthenorth,andinQld,fromthe
P.Dostine(NTM);2males,samelocality,3-4Feb 1992,P.Dostine tipofCapeYork.
(NTM);2males,LitchfieldNationalPark,WalkerCreek, 18-19Apr
1992,Wells(NMV). Etymology. NamedforPhillipSuter.
112 AliceWells
Figures 1-6,OecetispechanaMosely,male: 1,forewingsandhindwings;2-5,genitaliainlateral,ventral,dorsalandlateralviews,respectively
(4,afterMoselyandKimmins, 1953;5,imagetakenfromslidepreparation);6,wingscales(afterCSIRO 1991).
Australian Oecetispechana-group 113
Figures7,8,OecetiswalpolicaNeboiss,malegenitaliainventralandlateralviews(8,imagetakenfromslidepreparation).
Figures9-11,Oecetismagelensissp.nov.,malegenitalia: 9, 10,ventralviewandlateralview; 11,dorsalviewofrightinferiorappendage.
114 AliceWells
Figures 12-15, Oecetis suteri sp. nov, male genitalia: 12, dorsal view; 13, ventral view, 14, 15 lateral views (14, image taken from slide
preparation).
Figures 16, 17,Oecetisradonensissp.nov.,malegenitaliainlateralandventralviews(16,imagetakenfromslidepreparation).
Australian Oecetispechana-group 115
Figures 18-20,Oecetishumphreyisp.nov.,malegenitaliaindorsal,lateralandventralviews.
Figures21-24,Oecetiskateaesp.nov,malegenitaliaindorsal,ventralandlateralviews(24,imagetakenfromslidepreparation).
116 AliceWells
Oecetisradonensissp.nov. male,12°42'S,132°57'E,KakaduNationalPark,MagelaCreek,atRum
Pipeline,6-7May1991,P.Dostine(NMV);1male,1female,Gregory
Figures 16, 17,61 NationalPark,LimestoneGorge,25-26Oct1991,J.Webber(NTM);
Material examined. Holotype. Male, NT, Kakadu National Park, 1male,12°42'S, 132°57'E,KakaduNationalPark,MagelaCreek,OSS
RadonSprings,SuterandWells, 13-14Apr1989(NMVT-18840). Site009,14Apr1992,WellsandWebber(NTM);1male,samelocality,
Paratypes. NT: 17 males, 14females, samedataas forholotype 21-22Apr1992,P.Dostine(NTM).WA: 1male,1female.DeadHorse
(NMVandNTM: 1maleonslide);4males,3females.LittleBaroalba Springs,LakeArgyle, 19Feb 1977,J.E.Bishop(NMV); 1 male.Fine
NCarteieokn,al25P-a2r6k,ApBrar1o9a9l1b,aWeSlplrsinagsn,dW1e2°b4b8e'Sr,(A13N2I°C4)9;'E1,m4alMe.arKa1k9a9d2u, DSpurnicnagsnHCirgehewka,y,on23rFoeadb 1b9e7t7w,eJe.nE.LBaiskheopAr(gNyMlVe).tourist village and
Wells(NTM). Diagnosis. Closely similar to Oecetis radonensis, but male
Othermaterial.NT: 1male.RadonCreek,KakaduNationalPark, with inferior appendages distally more strongly tapered to
3 Sep 1979, J. Blyth (NMV). WA: 1 male, Mitchell Plateau,30Jan sharperapices,arowofsetaeontheinnermarginsub-apically;
1978,J.E.Bishop(NMV). abdominalsegmentXtriangular;andphallusofmediumlength
Diagnosis. Closely similarto O. humphreyi sp. nov. butmale withparamere,inlateralview, stronglyarcheddorsally.
distinguished by having inferior appendages in ventral view,
Description. Male. Wings withvestiture short; forewing with a
stout throughout length, rounded apically, and with 2 small broadscalepatch.Anteriorwinglength,4.6^1.7mm.Abdominal
patchesofsetaeatabouttwo-thirdslength;phalluslongerwith tergitesII-IVdarklysclerotised; segmentIXstronglyexcavated
paramereonlyveryslightlycurved. ventrally,withapairofsmall apico-dorsal papillae; segmentX
Description.Male.Wingsnarrow,darkmarkingsatcrossveins, broad-based, triangular in dorsal view, elongate and slenderin
anastomoses and at marginal ends of veins; vestiture short; lateralview.Genitalia,seefigs 18-20.Pre-analappendageswell
withasingleelongatepatchofscales;forewinglength4.8-5.5 separated,indorsalview,triangular.Phallusofmoderatelength,
mm.Abdominal segmentsIIIandIVwithtergites sclerotised; apically beak-like in lateral view; paramere strongly twisted at
segmentIXexcavatedmid-ventrallyandthusappearingtohave base in ventral view, in lateral view strongly arched dorsally.
well-developedlaterallobes;Xspatulateindorsalview,slender Inferior appendages in lateral view tapered towards apex, in
andelongateinlateralview. Genitalia,seefigs 16, 17.Pre-anal ventral view stout with apices convergent, short setae on inner
appendages sub-triangular. Phallus about 1.5 segments long; subapicalmargin,basi-dorsalpouchsmallandrounded.
phallotheca with membranous apex sharply down-turned; Distribution. Collected from the north of the NT and the
paramere in lateral view slightly curved. Inferior appendages KimberleyRegionofnorthernWA.
elongate and in ventral and lateral views almost uniformly
stoutthroughoutlength; inventralviewwithapicesin-turned, Etymology.NamedforChrisHumphrey.
withoutabasi-dorsalpouch;dorsallyatabouttwo-thirdslength
asmallgroupofshortsetaeonaraisedpapilla,anothercluster Oecetiskateaesp. nov.
onmesial margin, these possibly homologous withthe sets of Figures21-24,63
setaeonpapillaeinthebasi-dorsalpouchesseeninO.pechana
andotherspecies. Materialexamined. Holotype. Male, NT, 12°40’S, 132°53’E, Jabiru,
TownLake, 16Feb 1991,Wells(ANIC).
Distribution. FromtheKimberleyregionofnorthernWA and Paratypes. NT: 2 males, 14 females, same data as forholotype
thenorthoftheNT,butnotacommonlycollectedspecies. (NTM, ANIC); 22 males, 38 females, 12°42'S, 130°58'E, Berry
Springs, 9 Apr 1991, A. Wells and M. Horak (NTM, NMV);
Etymology. Named for the type locality, on the edge of Mt 14 males, 23 females, 13°03'S, 130°47'E, Litchfield National Park,
BrockmaninKakaduNationalPark. FlorenceFalls,6Jun1991,WellsandWebber(ANIC).
Othermaterial.Ninety-sevensamplesfromNT,Qld,NWWAand
Oecetishumphreyisp.nov. NENSW.
Figures 18-20,62 Diagnosis. Recognised by inferior appendages more slender
andsmoothlycurvedthanthoseofO.pechanaandO.walpolica,
Materialexamined. Holotype. Male,NT,RadonSprings, 13-14Apr
1989,SuterandWells(NMVT-18841). andbytheventrallyarchedparamereofthephallus.
Paratypes. NT: 2 males, same data as for holotype (NMV); Description. Male. Wings with short hair, darkly pigmented
1 male, 12°48'S, 132°49'E,KakaduNationalPark,BaroalbaSprings, hair and membrane at anastomoses of veins and crossveins;
25 Apr 1991, Wells and Webber (NTM); 4 males, females, same forewing with a single large patch ofscales. Forewing length,
localityandcollectors,29May 1991 (NTM); 2males,samelocality 5.1-5.9 mm. Abdominal tergites II-IV darkly sclerotised,
and collectors, 4 Oct 1991 (NTM); 1 male. Berry Springs, edge of segmentIXnarrow, almostaregularannulus, dorsally slightly
Melaleuca nr Billabong, 8-9 Apr 1991, Wells and Horak (NTM); pointed apico-mesially, segment X narrow, tapered towards
1male.BerrySprings,4Oct1991,Wells(NTM).
Othermaterial.NT:3males, 1female.ButterflyGorge,Katherine apex. Genitalia, see figs 21-24. Pre-anal appendages short,
Gorge National Park, 27 Jan 1977, M.S. Moulds (NMV); numerous widerthanlong.Inferiorappendagesstouterbasallythandistally
males, females, ARR Magela Creek OSS site 009, 15 Feb 1991, butalmostC-shapedinventralview,inlateralviewbroad-based,
A. Wells (NMV); 2 males, ARR Magela Creek 009, 15 Mar 1991, slender, upturned distally, basi-dorsal pouch present. Phallus
Wells and Webber (NTM); numerous males, females, 12°40'S, about length of 3 abdominal segments, membranous ventral
132°53'E,Jabiru,TownLake,2Apr1991,WellsandWebber(NTM);1 phallothecasmall,notdown-turned,paramerearchedventrally.