Heteragrion bickorum spec. nov. from Ecuador (Zygoptera: Megapodagrionidae)

2005·0.82 MB·English

by  Daigle, J J

Odonatologica34(2):165-168 June I.2005
SHORTCOMMUNICATIONS
Heteragrionbickorum spec. nov. fromEcuador
(Zygoptera: Megapodagrionidae)
J.J.Daigle
2067LittleRiver Lane,Tallahassee,Florida 32311,UnitedStates
e-mail:[email protected]
ReceivedJuly19,2004/Reviewed andAcceptedAugust30,2004
The newsp.isdescribedandillustrated (holotype3 andallotype 2[pairintandem]:
Ecuador, Napoprovince,Limoncocha,28-VIII-1980).Theholotypeandallotypeare
depositedintheFlorida StateCollection ofArthropods,Gainesville,Florida,USA.
INTRODUCTION
GARRISON (2003)listed41 species and1 subspecies of Heteragrion. Thenew
species describedhereinbringsthetotaldescribed speciesofHeteragrionto42.
HETERAGRION BICKORUM SP. NOV.
Figures1-5
Material. - Holotype3 andallotype 2 (pairintandem):ECUADOR, Sucumbios province,
Limoncocha,28-VIII-1980,S.W. Dunkle(SWD) leg.; - Paratypes(13 3, 2 2): - Ecuador,Napo
province.La Selva, 100kmECoca,streams inhillforestSofNapoR., 13-X-1988, 1 <J2'(pairintan-
dem), 1 3(SWD) leg.; Napoprovince, stream8.5km EofLoreto, 14-XI-1997,43,J.J.Daigleleg.;
samedata,1 3 2 (pairintandem),W.F.Mauffrayleg.;Orellana province, foreststream, 3.6kmfrom
Sci.ResearchSta.,ParqueNational Yasuni,18-V1I-1996,43, K.J.Tennessen(KJT)leg.;Napoprov-
ince,stream,Puyo Rd.,7.1kmSofNapo,21-VII-1996,2<J, (KJT)leg.Theholotypeandallotypepair
plus theMauffrayparatypepairaredepositedin theFlorida StateCollection ofArthropods(FSCA)
inGainesville,Florida,USA.The remainingparatypesareinthecollections ofSidneyW.Dunkle,Ken
J.Tennessen,JerrellJ.Daigle,PonteficiaUniversidad Catolica delEcuador (PUCE),Ecuador,andthe
National MuseumofNaturalHistory(NMNH) inWashington,DC.,USA.
Etymology. - Thespeciesisnamedafter George and Juanda Bick fortheir contribu-
tionstoneotropicalodonatology.
166 J.J.Daigle
MALE(holotype): Head. — Eyes inlifeyellow withblack dorsalareaextend-
ingposteriorlyfromleveloflateralocelli.Facebright yellow dorsallytojustbefore
level oflateralocelli(Fig. 4). Right antenna missing. Basal segmentof left anten-
nae yellow and the second segmentbrownwithyellow tip. Remaining segments
missing. Epicranium black withrear ofheadyellow.
Thorax. — Pronotumandposterior lobeblack, propleuron yellow. Middor-
salthoraciccarinablack. Black mesepistemum withathin, curvedpaleyellowline
dorsally and margined with yellow ventrally. Mesinfraepisternum mostly black,
ventralmargin yellow. Mesepimeron mostly black,margined withyellow dorsally
andventrally (Fig. 4). Metepisternum yellowdorsally, black ventrallywith yellow
margin. Metepimeron yellowwithpaleblackmid-lateralstripeincreasing inwidth
apically. Metinfraepisternumblackdorsally, yellowventrally. Venteryellow.
Legs. — Armatureand legs blackish-brown; coxae yellow withblack ventral
margins.
Wings. — 17-19postnodal crossveinsinforewing, 15-16hindwing. Venationblack,
darkbrownpterostigma overlying 1 1/2to2 cellswith theproximal sideoblique.
Abdomen.- Mostlyblack dorsally, yellow ventrally, withtinyyellowbasal
rings andcomplete black apical rings. Segment 1yellow withobscuredarkdorsal
area. Segment 2yellow, black dorsallywithyellowmid-dorsallinetaperingposte-
Figs 1-5.Heteragrionbickorumsp.n.,holotype3(1-4),andallotype 9(5):(1)head,prothorax,and
thorax,lateralview;—(2)caudalappendages,lateralview; — (3)same,dorsalview; —(4)rightcer-
cus, mediodorsalview;— (5)ovipositor,lateralview.
Heleragrionbicorum sp,n. 167
riorly. Segments2and3withdecreasing yellowmid-dorsalline.Segments 3-7black
withthinyellowbasalringandblackapicalring,theyellowlatero-ventralareaabout
0.5to0.75segmentlength. Yellowbasalringmostly obscuredonsegment7. Seg-
ment8mostlyyellowish-orange withblackbasaltriangularareadorsally. Segment
9 blackwithyellow ventralareasharply demarcated.Segment 10black,margined
withundulating ventralyellowarea.Inlateralview, cercus slender, ventralmedial
carinanot visible(Fig. 5).Vieweddorsally, cercusblack withapical portion wider
andstockier, therecessed areapale (Fig. 6).Dorsalmedialtoothprominent, form-
ing aconvex molar-likestructure distinctly separated fromventralmediantooth.
Paraproct yellowwithblacktip.
Measurements (mm). — Total lengthincludingappendages43.5,abdomen 36.3,forewing
22,5andhindwing22.5.
FEMALE(allotype). — Similartoholotype exceptface mostlyblack,postclypeus
with black concave arearearwards. Pale yellow line from eye toeye throughme-
dianocellus. Top ofheadmostly black withsmudged yellow areas. Rear ofhead
yellow. Pronotumand thoraxwithpaler yellow areas. Mid-lateralabdominalar-
eas,basal andapical rings wider. Segment 8 reducedin size, mostly brown. Seg-
ments9and 10yellow, lightbrown dorsally. Ovipositor yellow, genital valvewith
minute, evendentition(Fig. 11). Styluslightbrownwithyellowtip.Cercus yellow
withbrowntip.
Wings. - Similar to holotype but 19postnodal crossveins inforewing and 16
postnodal crossveinsinhindwing. Pterostigma overlies2 1/2to 3 cells.
Measurements (mm). — Total lengthincludingappendages38.0,abdomen 31.0,forewing
24.5andhindwing24.0.
VARIATIONAMONGPARATYPES. — Paratypes similarto holotype andallotype.
Totallength (mm)of d rangesfrom42-47, 241.5-42;abdomend 35-39, 2 33-35;
forewing d 22-23, 2 25-25.5;hindwing d22-24and224-26.Postnodalcrossveins
inforewing d 16-20,2 17-18andhindwing d 14-16, 2 14-17.
DISCUSSION
Heteragrion bickorumismostsimilarincolorationandsizetoH.bariai, aspecies
known fromRondoniaStateinBrazil(GARRISON, 1989),MadredeDiosDepart-
ment,Peru(BUTT, 1995),easternEcuadorandVenezuela(DEMARMELS, 1989).
It has somesimilaritieswith H. inca,anothercompanion species. Inthefield,the
contrasting yellowandblackeyecombinationinH. bickorummaleswillseparateit
fromH.bariaimaleswhoseeyes areblack aboveandolivaceousgreenbelow,and
fromH. incamaleswhichhaveblueeyes. Also, H. incahasagreenthoracicstripe
(antehumeral stripeofsome workers)butthisstripe isyellowin H.bickorum and
H.bariai.H. bickorumlacks theblackteardrop spotbetweentheantennaeandthe
eye(WILLIAMSON, 1919, p. 74, fig.47) seenin H. incaand some Ecuador H.
bariai. Themiddlepronotal lobeis black with yellowonthe extreme lateralmar-
ginin H.bickorum, brownishyellowin H. bariai andvariableinthewide-ranging
,
168 J.J.Daigle
H. inca(WILLIAMSON, 1919).Theblackandyellow demarcationonthelateral
sidesofabdominalsegments9and 10in H.bickorumisstrikingly morecontrast-
ing thanin H. bariaiand H. incawhichhave 9and 10 brown dorsallyandmore
diffusely markedlaterally.
Inlateralview,theventralmedialcarinaofthecercusis usually notvisibleinH.
bickorumandH. inca,whereasitisvisiblein //. bariai. Viewedlaterally, thedorsal
medialcarinaiselevatedandvisiblein II. bickorumand H.inca, hutit is not seen
in H.bariai(DE MARMELS, 1989,p. 58,fig.8).
InH. bariai,thedorsaland ventralmedialcannaeare moredistallylocatedcom-
pared to H.bickorumandH. inca.H. bickorum ismoresimilarto //. inca(WIL-
LIAMSON, 1919,p.84,fig. 114)intheappearanceoftheapicalportiononthecer-
cus. In dorsalview, theventral toothislongerandmoreprominentthanthedorsal
toothinH. bariai. Itis subequal or shorterinII.bickorumandH.inca.
Itshouldbenotedthatsome specimens ofH.incafromeastern Ecuadorhavea
darklabrumandabrighter greenantehumeralstripethanspecimens furthersouth
fromPeruandBolivia. Also, thefemalesofthesethreeHeteragrion species arevery
similaranddifficultto diagnose. Positiveidentificationofthefemalescanbestbe
madewithmatedor tandempairs.
Heteragrionbickorumisthusfarknown onlyfromeasternEcuador.II. bickorum
isalowlandrainforestspeciesbuthasbeenfoundinthelowfoothillsoftheeastern
Andes.Itprefers small shaded, muddy streams withsome gravel. Otherodonate
species collectedwithH. bickoruminclude//. bariaiDe Marmels, H.inca Calvert,
PerilesteskahliWilliamson&Williamson, Protoneurawoytkowskii Gloyd,andOli-
goclada abbreviata(Rambur).
ACKNOWLEDGEMENTS
IwishtothankSIDNEY W.DUNKLE, ROSSER W.GARRISON, and KENJ.TENNESSEN
fortheircommentsand review. IalsothankJOHNNY RICHARDSON andMIKEHEYN fortheir
helpwith thefigures.
REFERENCES
BUTT,M., 1995.Odonatacollected fromtheTambopata-Candamoreservedzone,southeasternPeru,
August1992-January1993. Notul. odonatol. 4(6):93-97.
DEMARMELS,X, 1989. Odonataor dragonfliesfromCerro dela Neblina. Boln Acad Cienc.fis.,
Caracas25: 11-78,81-87,89-91.
GARRISON, R.W., 1989.Brazil,Rondonia State.Argia(Suppl.) 1:2-4
GARRISON, R.W.,2003. Asynonymiclist oftheNewWorld Odonata. Version 11 November2003,
http.llwww.ups.edu/hiologylmuseum/NewWorldOD.html
WILLIAMSON,E.B., 1919.ResultsoftheUniversity ofMichigan-WilliamsonexpeditiontoColom-
bia,1916-1917.4. NotesonthespeciesofthegenusHeteragrionSelyswithdescriptionsofnew
species(Odonata).Occ. Pap. Mus. Zool. Univ. Mich.68: 1-89,12plsexcl.