Tactusa discrepans Fibiger 2010, new species
Creators: name: FIBIGER, MICHAEL
Publisher: name: Zenodo
Year: 2010
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Lepidoptera
Erebidae
Tactusa
Tactusa discrepans

description: Tactusa discrepans Fibiger, new species   
(Plate 4, figure 4; male genit. plate 14, figure 2)  
 Material examined. Holotype. Male, Thailand, Chieng Mai, Doi Inthanor Nat. Park, Siriphum, 1200–1300 m, 21.–24.x.1984, leg. O. Karsholt et al., genit. prep. 2947 M. Fibiger, coll. ZMUC.   
Paratypes. 3 males. 1 male, Thailand, Chiang Mai Prov., Doi Inthanor, Maeo Khan Klang, 1300 m, 16– 17.x.1983, leg. M. Owada, genit. prep. 3337 M. Fibiger; 1 male, N Thailand, Doi Suthep Pui, 1200 m, 26– 28.vii.1989, leg. J.D. & D.J. Bradley & Angoon Lewvanich, Brit.Mus. 1981-150, genit. prep. 3189 M.  
 Fibiger; 1 male, Thailand, Chiang Mai, Chiang Dao WS, h’way 1322 to Wiang Haeng, 5 km from Khun Mae Ngaay c’point, 780 m, 17.iv.1994, leg. IJ. Kitching et al., genit. prep. 3188 M. Fibiger, BMNH (E) 1994-97. Colls ZMUC, BMNH, and NSMT.   
 Diagnosis. Imago (external). Wingspan: 12 mm.   
Forewing: with a very large triangular, black patch, including fringes, that extends from antemedial point on costa to apex and to tornal edge; few light-brown patches present within large patch (apo.).  
Crosslines: parts of postmedial and subterminal lines present, light brown; terminal lines indicated by blackish-brown interneural spots; parts of fringes basally light brown, together forming a line.  
Reniform stigma: present; very narrow; yellowish, traceable only as slight widening of postmedial line, outlined broadly by black (apo.).  
Hindwing: dark grey, with indistinct discal spot.  
Underside: unicolorous grey.  
Abdomen: grey, with black crest dorsally on first segment.  
 Male genitalia. Tegumen: relatively strongly built.   
Vinculum: well built.  
Saccus: short; strongly built, broadly V shaped.  
Fultura superior: membranous.  
Valvae: asymmetrical, one on left broader; sacculus subbasally with a broad-based triangular process, setose at tip (apo.).  
Ampulla: forming a cross with axis of valva; slightly asymmetrical, broadest by valva; arms broad, dorsal arm longer, with small, stout spines at tip, and ventral arm equally broad throughout rounded apically (apo.).  
Digitus: present; hill-like and heavily sclerotised (apo.).  
Juxta and anellus plate: asymmetrical, fused, quadrangular ventrally and rounded dorsally, with hole for phallus at right side by rounded edge (apo.).  
Phallus: coecum very short, broad at ductus ejaculatorius, tapered conelike from there and bent ventrally, then curved smoothly upwards to tip (apo.).  
Vesica: unarmed.  
 Female genitalia. Unknown.   
 Differential diagnosis. T. discrepans differs from other members of second half of species-group in large blackish patch, with hardly visible, very narrow reniform stigma; in male genitalia, in triangular saccular process, rounded digitus, shape of ampulla, and ventrally quadrangular juxta-anellus plate.   
 Distribution. Known from four specimens from N Thailand, taken in April, July, and October.
description: Published as part of FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, pp. 1-119 in Zootaxa 2583 (1) on pages 32-33, DOI: 10.11646/zootaxa.2583.1.1, http://zenodo.org/record/10094382