Asytegumen absurdus Fibiger, 2010

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 76-78

Asytegumen absurdus Fibiger , new species

( Plate 9 , figure 5; male genit. plate 18, figure 5, 6; female genit. plate 25, figure 3)

Material examined. Holotype: male, Malaysia, Borneo , Sarawak, 15 mi. S Kuching, Semengoh Forest Reserve, 17.ix.1966, leg. J.F. and T. M. Clarke, genit. prep. 5727 M. Fibiger, coll. CNC.

Paratypes: 2 males, 2 females. All with same data as holotype, but 1 male with genit. prep. 5810 M. Fibiger; 1 male and 1 female with 12.ix.1966, female with genit. prep. 5811 M. Fibiger; 1 female with 20.ix.1966. Colls CNC and MF .

Diagnosis. Imago (external). Wingspan: 9–10 mm.

Head, patagia, anterior part of tegulae, prothorax, basal part of costa, and along costa of medial area: blackish brown.

Forewing ground colour: brown; with dark-brown patches, including tornal patch.

Reniform stigma: ovoid, beige.

Hindwing: grey; without discal spot.

Underside: forewing brown, hindwing grey, without discal spot.

Male genitalia. Tegumen: dorsal half extremely narrow, threadlike; ventral half, including peniculus fused with fultura superior; platelike (apo.).

Vinculum and saccus: very broad, loglike, asymmetrical (apo.).

Saccus: asymmetrical; V shaped.

Fultura superior: medially across diaphragm with long, free, ventrally directed, pointed process; fused laterally and basally to tegumen; apically free as two heavily asymmetrical processes, one platelike and one clublike; apical edges with humplike plates; right arm setose; left arm apically with cluster of long, narrow spines (apo.).

Valvae: prominently asymmetrical, ovoid, with long and strong sacculus and costa (apo.).

Editum : small, narrow, setose, positioned half way out, near costa (apo.).

Clasper: barlike, oblique to valva margins.

Ampulla: very large; bilobed; strongly asymmetrical; left lobe elongated, smoothly rounded; right one larger than left (apo.).

Digitus: ventro-apically fused to ampulla; dorsally developed as large, narrow processes; right one large, thumblike, as long as ventral part; left one huge, as long as valva; basal half curved, with irregular small or large, platelike processes; apical half huge, straight, spinelike (apo.).

Juxta-anellus plate: large, with hole for phallus.

Phallus: extremely long and narrow; S curved and clockwise coiled throughout; apical curve most prominent; distal sclerotised ¼ of phallus reduced to narrow rodlike extension; carina with 3 small spines (apo.).

Vesica: armed basally with a small spinelike cornutus.

Female genitalia. Ovipositor: short, smoothly elongated posteriorly (apo.).

Posterior apophyses: as long as ovipositor.

Anterior apophyses: slightly longer than posterior apophyses.

6 th, 7 th, and 8 th abdominal segments: totally fused; 8 th segment naked, 7 th and 6 th segments setose (apo.).

Ostium: large, round, displaced to left, positioned anteriorly on 7 th segment.

Antrum: basally wide, cylindrical; slightly longer than wide; otherwise long and narrow; clockwise coiled; heavily sclerotised (apo.) (antrum shaped as phallus, even anterior part).

Ductus bursae: posteriorly coiled, with narrow, sclerotised wall (to receive basal cornutus of vesica); otherwise membranous; narrow; 1.5 times longer than corpus bursae (apo.).

Corpus bursae: relatively large, globular.

Appendix bursae: arising posteriorly from ductus bursae.

Signum: cross shaped, longitudinally short, platelike.

Differential diagnosis. A. absurdus differs from other Obscurini species in:

- costal black patches in medial area;

- rosslines and reniform stigma indistinct;

male genitalia, in

- peniculus, vinculum, and saccus large, platelike;

- fultura superior laterally free, platelike, strongly asymmetrical;

- valva strongly asymmetrical, left one larger;

- ampulla strongly asymmetrical, relatively small;

- digitus asymmetrical, large;

- extremely long and narrow phallus, with rodlike extension;

- ductus bursae posteriorly with small, narrow and heavily sclerotised plate.

Distribution. A. absurdus is known only from Malaysia, Borneo, S Sarawak.

Figures

PLATE 9. Figures 1–8. Obscura, Editum, Asytegumen, Tolpia, and Disca species, adults. 1, 2, Obscura davisi, male holotype, Sri Lanka, Rat. District, Uggalkaltota and female paratype, Sri Lanka, Rat. District, Uda Walawe; 3, E. editoides, male holotype, Vietnam S, Mt.Ngoc Linh; 4, E. editum, male holotype, Vietnam, 20 km Di Linh; 5, Asytegumen absurdus, male holotype, Malaysia, Borneo, Sarawak; 6, Tolpia hainanensis, male holotype, China, Hainan; 7, T. paraunguis, male holotype, NE Thailand; 8, T. mons, male holotype, Indonesia, Java Centr., Predanger;