Tactusa major Fibiger, 2010

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 15

Tactusa major Fibiger , new species

( Plate 1 , figure 1; female genit. plate 22, figure 1)

Material examined. Holotype: female. Thailand, Chiang Mai Prov., Doi Inthanon Nat. Park , ca. 800 m, 24.x.1984 (O. Karsholt et al.), genit. prep. 2940 M. Fibiger, coll. ZMUC.

Taxonomic notes. T. major is a member of the T. sumatrensis species-group in which all species have a dark triangular apical extension of the medial triangle on the forewing, apex itself forming one angle, a second angle at costal edge of antemedial line and a third angle at termen by dorsum: the large triangle is actually composed of two triangles, one of which is the costal patch between antemedial and postmedial lines, with unequal sides, and the other is an equilateral triangle, with apex of the forewing as one angle.

Diagnosis. Imago (external). Wingspan: 11 mm.

Forewing: dominated by blackish oblique band; yellow patch proximal to apex (apo.).

Crosslines: only terminal line, indicated by small, black interneural spots.

Reniform stigma: present at outer edge of band.

Hindwing: dark grey, with indistinct discal spot.

Underside: unicolorous grey.

Abdomen: grey with black crest dorsally on first segment.

Male genitalia. Unknown.

Female genitalia. Ovipositor: quadrangular with rounded corners.

Posterior apophyses: longer than anterior apophyses and ovipositor.

Anterior apophyses: slightly longer than 8 th abdominal segment.

Ostium: displaced to left.

Antrum: prominent; long; with medial swelling (apo.).

Ductus bursae: membranous, long, narrow; 1.5 times longer than diameter of corpus bursae.

Appendix bursae: arising anteriorly from ductus bursae, immediately posterior to antrum.

Corpus bursae: globular.

Signum: cross shaped.

Differential diagnosis. T. major differs from other Micronoctuidae from SE Asian and Oriental regions in yellow patch in blackish triangle, black oblique band and, in female genitalia, in swelling in antrum.

Distribution. Known from a single specimen from N Thailand.

Figures

PLATE 1. Figures 1–7. Tactusa species, adults. 1, T. major, female holotype, Thailand N, Chiang Mai; 2, T. rima, male holotype, Vietnam N, Vinh Phuc; 3, T. sine, male holotype, Vietnam N, Da Lat; 4, T. sumatrensis, male holotype, Indonesia, North Sumatra; 5, T. schnacki, male holotype, India NE, Assam; 6, T. parasumatrensis, male holotype, Indonesia, North Sumatra; 7, T. trigonifera Hampson, 1898), male holotype, India NE, Assam.