A new species of Uscana Girault (Trichogrammatidae: Hymenoptera) from the eggs of Conicobruchus albopubens (Pic)

7 Pages·1999·4.9 MB·

by  H R Pajni

ANEW SPECIES OF USCANA GIRAULT(TRICHOGRAMMATIDAE:
HYMENOPTERA) FROM THE EGGS OF CONICOBRUCHUSALBOPUBENS
(PIC 1
)
H.R. Pajni and Seema Sood2
(With ten text-figures andtwoplates
)
Key words: Uscanafemoralis, Conicobruchus albopubens, pest, Cyamopsis psoraloides
A new species, Uscanafemoralis, isbeingreported fromtheeggsofConicobruchusalbopubens
(Pic), apest ofCyamopsispsoraloides DC (Hindi=gwar). A key to the known Indian species of
the genus Uscana is also given.
Introduction Chalcidoidea by the presence of 3-segmented
tarsi. Genus Uscana can be separated from the
Trichogrammatidae, including the well other genera of Trichogrammatidae by a
known Trichogrammaassociatedwithmanypest combinationofcharactersnamely: Antennawith
species, isafamilyexclusivelyofeggparasitoids one or two annulets, and placoid and fungoid
onavarietyofinsects. Uscana, anothergenusof sensillaonthe4-segmentedclub;broadforewing
TrichogrammatidaedescribedbyGirault(1911), with straight and thickened marginal vein and a
includes 16 species which aremostly associated rowofsetaeonRS, fromtiptostigma(Doutand
with the eggs ofdifferent species ofBruchidae Viggiani 1968).
(Viggiani 1979,Fursov 1987,Huiset. al. 1991).
From India, only one species namely Uscana Key to the species of Genus Uscana
mukerjii (Mani) has so far been recorded from Male with hind femora normal mukerjii (Mani).
the eggs ofstore bruchids (Mani 1935: reported Male with hind femora swollen femoralis, sp. n.
as Chaetostricha mukerjii). The taxonomy of
genus Uscana isquite complicatedanddifferent Uscanafemoralis sp. nov.
species are recognized from the number of (Figs. 1,6-14; Plate 1,2)
sensilla present on different segments of the
antennal club. On this basis, Steffan (1954) Description
divided the species under Uscana into three
groups. Uscana mukerjii was subsequently Female: Length 0.46-0.56 mm. Body
allocatedtoafourthgroup(PajniandSingh 1973). short, flat, with ovipositor turned upward and
The species under report is exceptional in forwardindryspecimens; headlightbrownwith
having greatly swollenhind femora inthemale, a face, front and vertex pale yellow; ocelli dark
featurenotobservedinany ofthe knownspecies. red; pronotum dark brown; mesoscutum pale
yellowwithtwolargebrownpatches;metanotum
Observations
paleyellow;tibiaandtarsiwithapicespalewhite.
Head wider than thorax; mandibles
The family Trichogrammatidae can be
quadridentate. Antenna with basal segment
distinguishedfromotherfamiliesofsuperfamily
slightly widened in middle; pedicel 1.3 times as
'AcceptedMarch,1997 long as wide; annulets two, normal. Club 2.6
departmentofZoology,PanjabUniversity, timesaslongasitsgreatestwidthatfirstsegment,
Chandigarh-160014,Punjab. approximately equal in length to antennal
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mm
0.05
Fig. 1: JJscanafemoralis sp. n., c?; Figs. 6-9: Uscanafemoralis sp. n., $ : 6. antenna;
7. mandible; 8. forewing; 9. hindwing.
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Figs. 10-14: Uscanafemoralis sp. n., d; 10. antenna; 1 1. forewing; 12. hindwing;
13. hindleg; 14. genitalia.
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Pajni P.R. & Sood S.: Uscanafemoralis Plate 1
Fig. 2 & 3: Uscanafemoralis Male: 2. Mesonotum; 3. Antenna.
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Pajni H.R. & Sood S.: Uscanafemoralis Plate2
Fig. 4 & 5: Uscanafemoralis Female: 4. Club segments with different types ofsensilla;
(a) placoid; (b) fungoid; (c) Chaetoid; 5. Fungoid sensillum
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segments3and4together,withobtusetriangular and third subequal, segment 1 slightly reduced
projectionondorsalsurfaceoffirstsegmentand on inside and prolonged on outside, segment 2
asimilarprojectionononesideofthirdsegment, withincurvedsidesandprojectinguppersurface,
with fourthsegmentpointedapically, with sides segment 4 bifid at tip; sensilla of club with
of first segment 1.6 times as long as second following distribution: placoid 1:1:1:0; fungoid
segment and half as long as segment 3 and 4 1:1:1:1; chaetoid 3:3:2:5.
combined. Club segments with following Forewing 2.3 times as long as its greatest
distributionofsensilla: placoid4:2:2:2, fungoid width, its fringe one third ofits greatest width;
1:2:1:0, chaetoid 2:4:6:4, with longest sensilla surfaceofforewing with discal setulae arranged
(chaetoid) 1.4 times as long asgreatestwidth of in 17 rows, with 13 ofthem uniform. Hindwmg
club. about 7 times the greatest width of free
Mesoscutum 1.6timesaswideaslong,with membrane. Hindfemurstronglybroadened,dark
ananteriorpairoflong andposteriorpairofshort brown; male genitalia with phallobase 3.0 times
setae; mesoscutal surface coarsely reticulate late- as long as broad.
rally andwitha stripe oflongitudinal reticulation Material: Holotype Male; from eggs of
inmiddle covering one fifth its area; scapula and Conicobruchus albopubens (Pic) on the pods of
axilla with single seta each; scutellum 1.9 times Cyamopsispsorciloides DC (guar); Coll. Seema
as wideas long, withananteriorpairofshortand Sood, 23.ix.1995; Chandigarh. Paratypes 8
posteriorpairoflongsetae,withcoarsereticulation males, 4 females; collectiondata same as forthe
onsidesandlongitudinalreticulationinthemiddle. holotype. Type material in Entomology section,
Postphragmareachingthe abdominaltergiteIV,a Department of Zoology, Panjab University,
little shorter than length ofmesonotum. Chandigarh. Regn. No. 135/99.
Forewingtwiceaslongasitsgreatestwidth Distribution: Areas surrounding
and its fringe one-fifth as long as its greatest Chandigarh.
width; costal cell 1.7 times as long as marginal Biology: A parasitoid of eggs of
vein; marginal vein 2.4 times as long as wide, Conicobruchusalbopubens(Pic),whichisapest
furnished with 3 costal setae, 6 short hairs on of Cyamopsis psoraloides DC (Hindi = guar).
dorsal side and 3 short hairs on ventral side; Under laboratory conditions, it also attacks the
radialveinfourfifthsthelengthofmarginalvein. eggs of Callosobruchus maculatus (Fabr.),
Surface of forewing with 16 rows of discal C. analis (Fabr.), C. chinensis (Linn.) and
setulae, 13ofthemrunninguniformly.Hindwing Zabrotes subfasciatus (Boh.).
about 8 times as long as its greatest width, its Etymology: The species has been named
fringe 1.5 times as long as greatestwidthoffree after the characteristic greatly swollen hind
membrane. femora ofthe male.
Abdomen 1.69 times as long as thorax;
ovipositor protruding, approximately equal to ACKNOWLEDGEMENTS
length ofmidtibia (16:14.5).
Male: Length0.39 -0.51 mm. Pedicel 1.5 We thank the University Grants
times as longaswide; annulets2;club 2.9to3.0 Commissionforfinancingaprojectonbiological
timesaslongasitsgreatestwidthatfirstsegment control of bruchids, and the Chairman,
and 1.5 times as long as segments 1 and 2 Department ofZoology, for providing research
combined,firstandthird segmentsequal,second facilities.
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References
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