Longiantrum Fibiger, 2010

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 54-55

Genus Longiantrum Fibiger , new genus

Type-species: Longiantrum burmaensis Fibiger , new species.

Taxonomic notes. The genus Longiantrum contains four species. The genitalia features indicate a close relationship with the previous genus, Costasensora . The four species in the genus are held together by several unique features.

Diagnosis. Imago (external). Wingspan: from 10–12 mm; type-species 12 mm.

Labial palps: porrect; second segment brown outside, beige inside, slightly longer scales vertically; third segment 1/4 of second, cylindrical, narrow, beige.

Head, patagia, anterior part of tegulae, prothorax, basal part of costa, costal part of medial area, and terminal area, including fringes: dark brown, costal medial area quadrangular.

Forewing ground colour: yellow and light or dark brown; unicolorous in most part of basal area; other parts of forewing dominated by black and brown patches (type-species), or with black and brown patches throughout.

Abdomen: light grey or grey; with dorsal tuft on basal segment.

Crosslines: antemedial and subterminal line indistinct, black or brown.

Terminal line: well marked by black interneural dots.

Reniform stigma: indistinct or well marked; round or narrow; white or beige.

Hindwing: light grey or grey, with indistinct discal spot.

Underside: forewing grey brown; hindwing grey, with discal spot.

Male genitalia. Tegumen: narrow throughout.

Vinculum and saccus: very stout; three times as broad as tegumen (apo.).

Saccus: short; broad or narrowly U shaped.

Valvae: relatively narrow; asymmetrical.

Clasper: barlike; slightly oblique or along valva margins.

Ampulla: very large; bilobed; slightly asymmetrical; that of right valva larger (type-species); lobes ventrally wide and apically rounded (type-species); tapered towards tip, which is 5 times narrower than broadest part (type-species).

Digitus: fingerlike or triangular.

Juxta: trapezoid, appearing as two symmetrical plates; medially narrowest and most heavily sclerotised (apo.).

Anellus plate: prominently asymmetrical, medially narrow; clublike apically (apo.).

Phallus: extremely long, narrow, and clockwise coiled; tapered smoothly to pointed tip; coecum short

Female genitalia. Ovipositor: short, smoothly rounded posteriorly and at corners.

Posterior apophyses: as long as ovipositor.

Anterior apophyses: almost as long as posterior apophyses; fused inside to fused 7 th –8 th segment (typespecies).

7 th and 8 th abdominal segments: strongly fused throughout (type-species) or separated by membrane.

Ostium: displaced to left.

Antrum: extremely long (apo.).

Ductus bursae: membranous and narrow, coiled clockwise posteriorly (apo.).

Corpus bursae: globular.

Appendix bursae: arising posteriorly from ductus bursae.

Signum: cross shaped.

Distribution. Species of Longiantrum are known from a large area from northern SE Asia to SW China.