Tactusa incognita Fibiger, 2010

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 25

Tactusa incognita Fibiger , new species

( Plate 2 , figure 8; female genit. plate 22, figure 4)

Material examined. Holotype, female. Thailand: Nakhon Naoyk Prov. , Khao Yai Nat. Park, ca. 700 m, 29.ix.– 6.x.1984, leg. O. Karsholt et al., genit. prep. 2939 M. Fibiger, coll. ZMUC.

Taxonomic notes. T. incognita is a member of the T. nieukerkeni species-group, all of which have a blackish triangular or quadrangular patch between the antemedial and postmedial lines; the typical Tactusa ampulla; and prominent features listed under the females of the species-group and individually for the species below and the next species.

Diagnosis. Imago (external). Wingspan: 9 mm.

Forewing: ground colour light yellow, with acutely-angled blackish patch in upper medial area, black subterminal area and three black dots on costa between medial patch and apex.

Crosslines: only subterminal and terminal lines indicated; former inwardly outlined by light yellow, latter indicated by black interneural spots.

Reniform stigma: well marked, white, outlined black.

Hindwing: dark grey, with very faint discal spot.

Underside: unicolorous grey.

Male genitalia. Unknown.

Female genitalia. Ovipositor: quadrangular with rounded corners.

Posterior apophyses: slightly longer than ovipositor.

8 th abdominal segment: extremely long (apo.).

Ostium: slightly displaced to left.

Antrum: short, cylindrical, with a medial swelling, curved at 45º (apo.).

Ductus bursae: membranous, long, narrow, coiled, 3.5 times longer than corpus bursae.

Appendix bursae: arising immediately posterior to antrum.

Corpus bursae: ovoid.

Signum: cross shaped.

Differential diagnosis. T. incognita differs from other Micronoctuidae from SE Asian and Oriental regions in long 8 th abdominal segment and peculiar shape of antrum, described above.

Distribution. Known from one specimen from Thailand.

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.