Chimarra dibangensis, Pandher & Saini, 2013

Pandher, M. & Saini, M., 2013, Three New Species Of Genus Chimarra Stephens (Insecta: Trichoptera) From Indian Himalaya, Acta Zoologica Academiae Scientiarum Hungaricae 59 (3), pp. 267-277 : 271-273

Chimarra dibangensis sp. n.

(Figs 11–15)

Description: Adultmale; colorinalcoholbrown, wingspalehyaline, antennadark brown, headdorsumdarkbrown, legspaleyellowish. Lengthfromtipofheadtoapexof foldedforewing 5.25 mm; maxillarypalp 1.25 mmlong, 3rdsegmentabout 1.5 timeslonger than 2ndsegment, subequalinthelengthto 5thsegment; labialpalp 0.50 mm. Forewing length 4 mm; venation: Rscurved, thickened, discoidalcelllong, morethantwiceitswidth; cross vein m in close proximity of s and r-m cross veins, 2A looped to 1A; hind wing about 3 mm long.

Malegenitalia (Figs 11–15) – TergumIXpointedposterodorsally, reduced; anterior marginconcave; anteroventralmarginslightlyproduced; posterolateralmarginconvex; posteroventralprocesswelldeveloped, pointed. Preanalappendageseachrounded, setose inlateralview; globoseindorsalview.Inferiorappendages, eachalmostequaltotergumX; inlateralviewdorsallyinflectedbasoventrally, almostuniformlywide, withserrateventral margin; inventralview, widebasallywithmedianlobeonmesalsurface, curved, pointed apicomesally. TergumXwithlateralsclerotizedlobesandseparatemesallobes; eachlaterallobebroadbasally, downwardlycurvedmedially, eachbearing 2 sensilla, onebaso mediallyandanotherapicallyinlateralview; wedge- shapedindorsalview; eachmesal lobedigitate, bifidatapex, smallthanlaterallobes. Phallobase, rounded, andsclerotized. Endothecatubular, lengthnotdiscernable, producedventrallynearbaseinlateralview, withtwolateralrowsofcomblikespines; phallotremalcomplexvisibleinventralview, withwelldevelopedringandrodstructure.

Figs 11–15. C. dibangensis sp. n., malegenitalia: 11 = leftlateralview, 12 = dorsalview, 13 = ven- tralviewofrightinferiorappendage, 14 = phallusventralview, 15 = phallusleftlateralview.

Diagnosis – Inpossessionofwelldevelopedposteroventralprocesson sternumVIII, thisspeciesissimilarto Chimarraexapia MalickyetChantara- mongkol, 1993 and C. atnia MalickyetChantaramongkol, 1993 bothreported fromThailand. However, C. dibangensis sp. n. isdistinguishedfromthesespe- ciesbythepresenceofdorsallydirectedinferiorappendageinlateralview; in lateralviewthelaterallobeoftergumXhastwosensillaonebasalandanoth- erapicalone. Thesesensillaearenotpresentintherelatedspecies. Moreover, thereareconsiderabledifferencesvisibleinthephallus, andtheshapeand numberofendothecalspinesinallthethreespecies.

Material – Holotype, male, India: ArunachalPradesh , Roing, 800 m, 2-v-2010, Pand- her & Parey ( NPC) . Paratype: 2 females, collectiondatasameasofholotype.

Distribution – India: ArunachalPradesh.

Etymology – Thespeciesnameisderivedfromthedistrict: “LowerDibangvalley” in

whichtypelocalityfalls.

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Acknowledgements – Dr. H. Malicky (LunzamSee, Austria) andDr. J. C. Morse (ClemsonUniversity, USA) kindlysupporteduswithrelevantliteratureandvaluablesugges- tions. WearegratefultoDr. V. V.Ramamurthy, NationalCoordinator, NetworkProjecton InsectBiosystematics, IndianAgriculturalResearchInstitute, GovernmentofIndia, New Delhi (GrantNumberNPIB-21-17) forprovidingfundsforthisstudy. Necessarylabora- toryfacilitieswereprovidedbytheDepartmentofZoologyandEnvironmentalSciences, PunjabiUniversity, Patiala. Thanksarealsoduetovariousforestofficials, especiallyMrs. U. G. Lachungpa., SeniorResearchOfficerWildlifeSikkim; PrincipalChiefConservatorof Forests & ChiefConservatorofForestsandDistrictForestOfficer, ArunachalPradeshfor providingnecessaryfacilitiesduringexpeditions.