Description of Devadatta glaucinotata spec. nov. from Laos (Zygoptera: Amphipterygidae)

6 Pages·2003·2.2 MB·English

by  Sasamoto, A

Odonatologica32(4):381-386 December 1, 2003
DescriptionofDevadatta glaucinotata spec. nov.
from Laos
(Zygoptera: Amphipterygidae)
A.Sasamoto
190-4 Yakuoji,Tawaramoto-cho,Shiki-gun,
Narapref.636-0341,Japan
ReceivedMarch6, 2003/Reviewed andAcceptedApril 14,2003
Thenewsp.(holotype<J:Phatang,VangViengarea,centralLaos,20-IV-2002;deposited
atNSMT,Tokyo)isdescribed,illustrated andcomparedwiththealliedspp.
INTRODUCTION
InApril2002theauthorhadachancetovisitVangViengareainVientianeprovince,
centralLaos. Many interesting submontaneOdonataspecies couldbeobserved and
collectedinnaturalforests. Amongthemwas aDevadattaspecies, whichcanreadily
berecognized as anewspecies by thestriking blue-gray colourpatternonthethorax.
Itis thethirdspecies ofitsgenusknowntooccur inLaos.
DEVADATTA GLAUCINOTATA SP. NOV.
Figures 1,2a,3-4
Material. — Holotype 6: Laos, Vientiane province, Vang Viengarea, Phatang,20-IV-2002,
AkihikoSasamotoleg.Holotypewill bedepositedintheNational ScienceMuseum,Tokyo.Paratypes: 2
<J, sameplace and collector, 22- IV-2002, depositedinauthor’sprivate collection andin Coll.Matti
Hamalainen.
Etymology. —The speciesname“glaucinotata”means“havingmaculations ofpaleblue-gray
colour”,derivingfromthecharacteristiccolourofthesides ofthepterothorax.
MALE. — Head. — Labiumcreamyochreous,tipsof hooksblack;partofbaseof
mandiblesandadjoiningpartofgenaepaleblue; marginofbaseof mandible,labrum,
anteclypeus, postclypeus.Irons,vertexandocciputentirelydarkindigobluewithmetallic
lustre.Betweenposteriorocelliandbaseofantennaeanobscureochreous spot.Antennae
382 A. Sasamoto
uniformbrownish. Rearofheaddarkbrownwith whitishpruinescence. Widthacross
eyes5.8mm.
Thorax. — Prothoraxwithanteriorlobebluishgray;medianlobeblackwithlarge
creamywhitequadrangle spots laterally; posterior lobewholly blue-gray, withapair
of very thinblack streaks runningalong erectedpronotal ridge.
Dorsumofpterothorax whollyblack. Mesepimeronandmetepistemum largelyblue-
-gray,withanteriorcomerofmesepimeronblackandwithablackish,somewhatobscure
stripeabovethesecondlateralsuturecrossing thestigma andatwingmarginextending
obscurely upwards along subalarridge. Metepimeron blue-gray, with obscure dark
markings inanteriorhalfandon wingborder.Ventralsurfaceofthoraxpale graywith
several dirtyspottymarkings. Coxa,trochanterintermingled withblackishbrownand
dirtygray colour.Femoraandtibiaebrownishblack, obscurely striped with grayish
colour; innersurfaceofhindtibiaepale.
Wings (Fig. 2a) — Membranehyaline, slightly suffusedwithbrownishcolour in
olderspecimens. Venationblack. Number ofantenodals8-10in bothwings, 35-39
postnodals in fore-, and 28-33 in hindwing. In bothwings 4-5 antenodalnervures
wherethe costal and subcostal halves coincide;accessory antenodalsin costalhalf
number4-5inforewingand4-6inhindwing. Acsituatedbetween3rdand4Ihantenodal
veinsinfore wing, at4th orbetween4thand 5th inhindwing. Both wings petiolated
slightly proximal toAc. Arc situated at4,hantenodalvein infore-, andat5thinhind
wing.Discoidalcell4-celled,costalside6timesaslong as proximal side.Pterostigma
withabout3 1/2to4underlyingcells.Posteriormarginofpterostigmaslightlyswollen,
proximal side very oblique. Longitudinal veins are gently recurving towards wing
margin, especially inhindwing.
Abdomen. — Segment 1 black,coveredbroadly by obscure palebluecolouron
dorsum.S2-S7 black, withpairoftiny baso-lateral, creamy white spots as follows:
spot on S2 short and streak-like, those on S3-S7 notch-like, becoming smallerand
semicircular towards
apical segments. S8-
-S10wholly black. S9
conspicuously
broadening towards
apex, but S10 again
slightly narrowing
towardsapex.
Anal appendages
(Figs3a-b).— Superior
appendages are about
1.5 times longer than
S10. Distal half of
superiors incurvingand
Fig. 1.Devadatta glaucinotatasp.n., 6 holotype. dilatinginwards,slight-
Devadattaglaucinotatasp.n. 383
ly curving downwards
at its apex. Inferior
appendages are about
one-halfofthelengthof
thesuperiors,withdistal
portionslightlycurving
upwards, its tips
forming sharpened
hookspointinginwards.
Penileorgan(Figs4a-
-b). — Gians ofpenis
with slender pro-
tuberances, apices of
which are slightly
dilated. The stem of
penis bearing many Fig.2.Devadatta spp. forewings:(a)glaucinotatasp.n.,holotype; —(b)
golden yellowhairs on sp. fromLaos; identityuncertain;cf. text; — (c)ducatrixfromVietnam.
bothsides.
Measurements (inmm). —Abdomen,includingappendages36-38; hind wing29-32.5
FEMALEunknown.
NOTES ON HABITATANDECOLOGY. - These damselflieswere found ata small,
shallowtrickleonasteepshadowy androckyslope coveredwithdensetallbushes in
an intactforest. Thetype locality, Phatang, is a submontanevalley area, located in
centralLaos, ca300m highabove sealevel.Thehabitatis typicalforaDevadatta(cf.
LIEFTINCK, 1954).The malesseemedtokeep smallterritoriesinshadowy spotsand
perched atthinsticksabovethewater andwerenever observedatasunnyspot. Atthe
samesite, Burmargiolestes melanothorax(Selys, 1891),Coelicciad. didyma(Selys,
1863)and C. chromothorax(Selys, 1891) wereobserved.
DISCUSSION
D. glaucinotata sp, n. differsfromallotherdescribedcongenersby its conspicious
bluishcolourpatternofpro-andsynthorax. Thebasicstructureoftheapical abdominal
segments, anal appendages and penile organindicatethatthe newspecies is closely
relatedtoD.ducatrixLIEFTINCK, 1969,whichwas describedonthebasisofasingle
malefrom‘Tonkin,Than Moi”, a sitein Lang Son province in northernVietnam.I
havestudied4malesand2femalespecimensofD. ducatrixfromTamDao,VmhPhu
province,Vietnamkindlyprovided by M.Takagi.D. glaucinotatasp. n.andD.ducatrix
malesdiffermarkedly inthecolourpattern, shape ofwingsandvenation.
D. glaucinotata(Fig. 1)is aslimmerinsectcompared withthemorerobustducatrix
(Fig.5).
384 A.Sasamoto
- Part of the base of mandiblesand adjacent part of genae are pale bluish in
glaucinotata,but blackishbrowninducatrix.
- Posteriorlobeofpterothoraxiswhollyblue-gray inglaucinotata black inducatrix.
,
- In glaucinotata, the humeralsuture sharply delimitatesupperblack andlower
blue-gray area (permanent colour, not pruinescence) on sides ofpterothorax. In
ducatrix, pterothorax is whollyblackwiththickpruinescence inolderspecimens,
somewhatvariableinitsextend.
— Wingsofglaucinotata (Fig.2a)are clearlynarrower;inducatrixthewing(Fig.2c)
broadens more abruptly after the petiolation atbase; apical darkspots widerin
ducatrix.
- In glaucinotata only one cellrow betweenIAandhind wingborder, 2-3rows in
ducatrix.
- Ends ofthelongitudinal veinsbend quite smoothly towardsthe wing borderin
glaucinotata(Fig. 2a),whereasinducatrixtheyrecurveclearlymoreabruptly(Fig.
2c), inforewingentering almostperpendicularly tothewingborder.
— Inferiorappendages of glaucinotata are gently curving upwards (Fig. 1), butin
ducatrixthey arerelatively linear(cf. fig.2inLIEFTINCK, 1969).
- Inventralview,theapicalborderofS10looksmoreconcaveandS10proportionally
shorteringlaucinotata than inducatrix.
Figs3-4. Devadatta glaucinotatasp.n.,cJholotype:(3)caudalappendages:(a)leftlateral view;— (b)
dorsal view; - (4)penileorgan:(a)ventralview; - (b)left lateral view (includinganteriorhamulus).
Devadatta glaucinotatasp.n. 385
Recently YOKOI
(1999) reported on 2
males identifiedas D.
ducatrix from Vang
Vieng, stating “The
specimens agree with
D. ducatrix from
Vietnam,described by
LIEFTINCK(1969),in
eachpartofbody and
appendages”.Thanksto
hiskindness, I had an
opportunitytoexamine
these specimens and
compare them with Fig.5.Devadatta ducatrix <J fromVietnam
Vietnamesespecimens
of ducatrix. Colourpatternofheadandabdomen,the structure ofpenile organ,and
anal appendages are similaras in theVietnameseducatrix specimens, but theVang
Vieng specimens differinthefollowing points:
— Wings arenarrower, slightlylessroundedatapex;only two cellrows betweenIA
and wingborderin hindwing(2-3 rows inVietnameseducatrix). Wing tips less
extensively darkened.However,thelongitudinal veinscurvetowardswingborder
as abruptly asinVietnameseducatrix(Fig. 2c).
— Anteriorlobeofprothorax has two smalloval-shaped yellow spots, whilewholly
black inVietnamaseducatrix.
— Black sides ofpterothoraxare furnishedwithdistinctpalestripes along thelateral
sutures (see YOKOI, 1999, p. 3, fig. 4); pterothorax slightly pruinescent
ventrolaterallyandventrally. ThepalestripesresemblesthosedescribedbyFRASER
(1933)for his D. multinervosafrom ”Pu Tat, Laos”. However, according to
LIEFTINCK(1969),multinervosahas maleinferiorappendages ’’reducedtomere
blunttubercles”andinitthe’’endsoflongitudinal veinsandtheirsupplements are
gentlyrecurved towardsthewing margin”.
ThesedifferencesbringsomedoubtoftheidentityofYokoi’sVangViengspecimens.
Until moreDevadatta material, including females,from areas between Vang Vieng
andVietnamcome available, Iprefer to leavetheiridentity open. Anyway Yokoi’s
specimens are also very distinctfromD. glaucinotata spec.nov. It is surprising that
two Devadattaspecies occurinsites only some20km apart.
Itshouldbepointed outherealso that,according totheinformationreceivedfrom
Dr Math Hämäläinen(pers. comm., 2002), neitherofthese Laotaxa are conspecific
withtheundescribedDevadattaspecies, preliminarily reported fromCentralVietnam
by VANTOL&ROZENDAAL (1995).Thus, atleast4-5Devadattaspecies occurin
Indochina.
386 A.Sasamoto
ACKNOWLEDGEMENTS
Iam deeplygratefultoDrMATTIHAmALAINENforhisverykind and usefuladviceconcerningthe
manuscript,toDr NAOTO YOKOIfor arrangementsofmy Laos trip,for loan ofspecimensandkind
advice,toMr VILAYSAKSOUPHANTHONGforgoodguidanceinthefield,toMrMASATOTAKAGI
forkindlygivingmehisVietnamesematerials,andtoMrTERUOHONDAforaccompanyingandhelping
mein the field.
REFERENCES
FRASER, F.C., 1932. DragonfliesfromtheLaoscountry. J.Siam Soc. not.Hist. (Suppl.)9(1): 109-141.
LIEUlNCK,M.A., 1954. HandlistofMalaysianOdonata: acatalogueofthe dragonfliesofthe Malay
peninsula,Sumatra,Javaand Borneo, includingtheadjacentsmall islands. Treubia22(Suppl.):
xiii+202 pp, 1map.
LIEFTINCK,M.A.,1969.Twonew OdonatafromSoutheastAsia,withcommentsonpreviouslydescribed
species.Dt.enl.Z(N.F.) 16:205-215.
VANTOL,J.&F.G.ROZENDAAL, 1995. RecordsofCalopterygoideafromVietnam,withdescriptions
oftwonewspecies(Zygoptera:Amphipterygidae,Calopterygidae,Chlorocyphidae,Euphaeidae).
Odonatologica24(1):89-107.
YOKOI,N„ 1999.DragonfliesofcentralLaosinmid-summer. Gekkan-Mushi 342; 2-7.