Tactusa discrepans yunnanensis Fibiger

Fibiger, Michael, Han, Hui-Lin & Kononenko, Vladimir S., 2011, Five new species and one new subspecies of Micronoctuidae from China, with a checklist of Chinese species, including Taiwan (Lepidoptera: Noctuoidea, Micronoctuidae), Zootaxa 2777, pp. 41-53 : 46-47

Tactusa discrepans yunnanensis Fibiger , new subspecies

( Figs. 9, 10 , 19, 23 )

Material examined. Male. China, Yunnan prov., Jiangcheng, 15–17.ix.2008, leg. Han, H.L., Qi, M. J. & Liu, E., genit. preps 6215 M. Fibiger, coll. NEFU. Paratypes. 3 males, with same data as holotype, genit. preps, 6216, 6217, 6218 M. Fibiger, colls NEFU and M. Fibiger; 3 female, China, Guizhou prov, Huangguoshu, 24–26.ix.2008, leg. Han, H.L. & Qi, M. J., genit. prep. 6225, 6227, 6231 M. Fibiger, colls NEFU and M. Fibiger.

Diagnosis. Extermally it is similar to T. discrepans . In the genitalia the tegumen is narrow, relatively short (shorter than that of subsp. discrepans ); valva without a setose hump near clavus area (a setose hump present in subsp. discrepans ); ampullae relatively narrow and rounded at tips (in subsp. discrepans broader and more pointed at tips); juxta narrower than that of subsp. discrepans ; coecum of phallus short, broad, triangular (in subsp. discrepans longer and narrower); phallus basally at ventral side with hump (straight in subsp. discrepans ), and phallus less curved compared with that of subsp. discrepans . The female genitalia has not been known before. Ovipositor broad, rounded, setose; posterior apophyses as long as ovipositor; anterior apophyses slightly shorter than posterior apophyses; 8th abdominal segment separate from 7th segment; 8th abdominal segment narrow, 5 times wider than long; ostium round, positioned anteriorly on 8th abdominal segment; ostium round, positioned at anterior end of 8th abdominal segment; antrum tapered slightly throughout, projected slightly to the left; ductus bursae long and narrow, 2.5 times as long as corpus bursae; corpus bursae ovoid, with cross-shaped signum.

Description. Adults ( Fig. 9, 10 ). Wingspan: 9.5– 12 mm. Head, thorax, and ground colour of forewing light brown; costa-medial and area outward and to tornus black and brown; antemedial line invisible; postmedial line beige, almost straight; subterminal line broad, black, waved; terminal line marked by black interveinial dots; fringe black. Hindwing unicolourous grey, with discal spot; fringe grey. Ventral surface unicolourous brown.

Male genitalia ( Fig. 19 ). Described in comparison with T. discrepans discrepans . Tegumen narrow, relatively short (much shorter than that of ssp. discrepans ); vinculum, and saccus equally narrow, the latter V-shaped; valvae broadest medially, asymmetrical, right valva shorter; valva without a setose hump near clavus area (present in ssp. discrepans ); valva with small subbasal process, positioned next to junction of tegumen and vinculum; ampullae relatively narrow and rounded at tips (in ssp. discrepans broader and more pointed at tips); digitus heavily sclerotised, rounded; juxta narrower than that of subsp. discrepans ; coecum of phallus short, broad, triangular (in ssp. discrepans longer and narrower); phallus basally at ventral side with hump (straight in ssp. discrepans ), phallus less curved compared with that of subsp. discrepans ; vesica unarrmed.

Female genitalia ( Fig. 23 ). Previously unknown. Ovipositor broad, rounded, setose; posterior apophyses as long as ovipositor; anterior apophyses slightly shorter than posterior apophyses; 8th abdominal segments separated from 7th segment; 8th abdominal segment narrow, 5 times wider than long laterally; ostium round, positioned at anterior end of 8th abdominal segment; antrum tapers slightly throughout, projects slightly to left; ductus bursae long and narrow, 2½ times longer than corpus bursae; corpus bursae ovoid, with cross-shaped signum.

Bionomics. The biotope is dominated mainly by broad-leaf trees, shrubs and many herbaceous plants, close to a river. All specimens were collected at light in mid September. The early stages are unknown.

Distribution ( Fig. 30 ) China (Yunnan prov.). The nominate subspecies occurs in northern Thailand.

Figures

FIGURES 9 – 13. Micronoctuidae spp., adults. 9. Tactusa discrepans yunnanensis, male, holotype, China, Yunnan (NEFU); 10. T. discrepans yunnanensis, male, holotype, China, Yunnan (NEFU); 11. T. pars, China, Yunnan (NEFU); 12. T. brevis, male, holotype, China, Yunnan (NEFU); 13. T. brevis, male, paratype, China, Yunnan (NEFU)

FIGURES 19 – 25. Micronoctuidae spp., male and female genitalia. 19. Tactusa discrepans yunnanensis, male, holotype (NEFU); 20. T. pars, male (NEFU); 21. T. brevis, male, holotype (NEFU); 22. Belulla bibela,. female, paratype (NEFU); 23. Tactusa discrepans yunnanensis, female, paratype (NEFU); 24. T. pars, female (NEFU); 25. T. brevis, female paratype (NEFU).

FIGURES 26 – 30. Collecting sites and distribution map. 26. Broad-leaved and mixed forest, Huangguoshu, Prov. Guizhou. 27. Broad-leaved forest and banana plantations, Huangguoshu, Prov. Guizhou; 28. Broadleaved forest, Jiangcheng, Prov. Yunnan; 29. Mixed forest with Pinus yunnana, Lancang, Prov. Yunnan 30. Distribution map. Collecting localities: 1. Huangguoshu (Prov. Guizhou) 2. Guanling (Prov. Guizhou); 3. Lincang (Prov. Yunnan); 4. Mojiang (Prov. Yunnan); 5. Jiangcheng (Prov. Yunnan); 6. Lancang (Prov. Yunnan); 7. Jinghong (Prov. Yunnan).