Tactusa flavoniger Fibiger, 2010

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 22-23

Tactusa flavoniger Fibiger , new species

( Plate 2 , figure 5; female genit. plate 22, figure 3)

Material examined. Holotype: female, Laos, Prov. Vientiane, Ban Van Eue , 31.xii.1968, leg. Native collector, genit. prep. 3329 M. Fibiger, coll. BPBM.

Taxonomic notes. T. flavoniger is a member of the trigonifera species-group, which has a blackish triangular or quadrangular patch between the antemedial and postmedial lines; the typical colouration; and a prominent, conelike antrum.

Diagnosis. Imago (external). Wingspan: 14 mm.

Forewing: ground colour yellowish, with acutely-angled blackish, triangular patch in upper medial area;

and a black subterminal area.

interneural black spots.

Reniform stigma: well marked, white.

Hindwing: dark grey, with indistinct discal spot.

Underside: unicolorous grey.

Male genitalia. Unknown.

Female genitalia. Ovipositor: quadrangular with rounded corners.

Posterior apophyses: longer than anterior apophyses.

Anterior apophyses: slightly longer than 8 th abdominal segment.

Ostium: displaced to left.

Antrum: prominent, long, conelike, curved and tapered (apo.).

Ductus bursae: subbasally with sclerites, otherwise membranous, three times longer than diameter of corpus bursae (apo.).

Appendix bursae: arising anteriorly from ductus bursae, immediately after antrum.

Corpus bursae: globular.

Signum: cross shaped.

Differential diagnosis. T. flavoniger differs from other Micronoctuidae from SE Asian and Oriental regions in shape of antrum and structures of ductus bursae in Female genitalia.

Distribution. Known from a single female specimen from Laos.

Figures

PLATE 2. Figures 1–8. Tactusa species, adults. 1, 2, T. nilssoni, male holotype, Thailand, Phuket, and female paratype, with same data; 3, T. ostium, female holotype, Thailand, Nakhon Naoyk; 4, T. peregovitsi, male holotype, Vietnam N, Nghe Aniwan; 5, T. flavoniger, female holotype, Laos, Vientiane; 6, T. nieukerkeni, male holotype, Vietnam, Vinh Phuc; 7, T. topi, male holotype, China, Guangdong, Canton; 8, T. incognita, male holotype, Thailand, Nakhon Naoyk.