Tactusa pars Fibiger, 2010

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 34-35

Tactusa pars Fibiger , new species

( Plate 4 , figure 6; male genit. plate 14, figure 4; female genit. plate 23, figure 2)

Material examined. Holotype: female, Thailand West , Kanchannaburi, at River Kwai Resotel, 19– 22.vii.2003, leg & coll. M. Fibiger, later to be deposited in ZMUC.

Paratypes: 5 males, 1 female. 1 male with same data as holotype, but genit. prep. 4986 M. Fibiger ; 1 male, W Thailand, Prov. Uthai Thani, Khao Nang Rum , 400 m, 17–18.xi.1985, leg. M.G. Allen, BM 1986-74 , genit. prep. 3768 M. Fibiger ; 1 male, 1 female, Thailand N, 30 km N Mae Hong Son, Karen village, 1100 m, 16.vii.2003, genit. preps 4985 and 4991 M. Fibiger; 1 Malaysia, West Pahang, Genting Tea Estate , 2000 ft., 6.xii.1985, leg. H.S. Barlow, BM 198 -, genit. prep. 3767 M. Fibiger; 1 W Malaysia, Fraser’s Hill Steakhouse, 18.vi.1992, leg. M. Lödl, genit. prep. 4131 M. Fibiger. Colls MF, BMNH, and NMW .

Diagnosis. Imago (external). Wingspan: 10–11 mm.

Forewing: ground colour yellow, with very large triangular patch, including fringes, that extends from antemedial point on costa, to apex and to tornal edge; light-brown triangular patch present subapically by costa (apo.).

Crosslines: parts of postmedial and subterminal lines present, whitish; terminal line indicated by blackish brown interneural spots; parts of fringes basally whitish, together forming a line.

Reniform stigma: hardly traceable.

Hindwing: dark grey, with very faint discal spot.

Underside: unicolorous grey.

Abdomen: grey, with black crest dorsally on first segment; that of female with yellow apical tuft.

Male genitalia. Tegumen: relatively strongly built.

Vinculum: well built.

Saccus: short, strongly built, broadly U shaped.

Ampulla: forming a cross with axis of valva; prominently asymmetrical, broadest by valva; right ampulla much larger, with a sickle-like long, flat process (apo.).

Digitus: present; small; apically rounded; heavily sclerotised (apo.).

Juxta and anellus plate: asymmetrical; fused; rounded; with a deep cleft for phallus (apo.).

Phallus: coecum relatively long, pointed; broad at ductus ejaculatorius; tapered smoothly throughout, and curved upwards (apo.).

Vesica: unarmed.

Female genitalia. Ovipositor: quadrangular with rounded corners.

Posterior apophyses: 1.5 times longer than anterior apophyses and ovipositor.

Anterior apophyses: slightly longer than 8 th abdominal segment.

8 th abdominal segment: sclerotised part ventro-posteriorly close; anteriorly wide (apo.)

Ostium: displaced to left.

Antrum: very short, tapered (apo.).

Ductus bursae: membranous, relatively short, narrow, coiled; as long as diameter of corpus bursae.

Appendix bursae: arising medially from ductus bursae (apo.).

Corpus bursae: large, globular.

Signum: cross shaped.

Differential diagnosis. T. pars differs from other members of second half of species-group in large blackish patch, with a triangular yellow patch by costa; in male genitalia, in shape of ampullae, right one with a very long, curved, flat process; large process of ampulla; in female genitalia, in shape of 8 th abdominal segment; equal length of ductus and corpus bursae.

Distribution. T. pars known from West Thailand, from North to South, and extends to western Malaysia.

Figures

PLATE 4. Figures 1–8. Tactusa, Conspica, and Tumula species, adults. 1, T. similis, female holotype, Thailand, Chiang Mai; 2, T. constrictor, male holotype, Laos, Vientiane; 3, T. assamia, male holotype, India NE, Assam; 4, T. discrepans, male holotype, Thailand, Chiang Mai; 5, T. spadix, male holotype, Laos, Vientiane; 6, T. pars, male holotype, Thailand W, Kanchannaburi; 7, Conspica inconspicua, male holotype, Thailand, near Ban Nam Lee Pattana; 8, C. parainconspicua, male holotype, Thailand, Chiang Mai.