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

description: 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.
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 34-35, DOI: 10.11646/zootaxa.2583.1.1, http://zenodo.org/record/10094382