Asytegumen absurdus Fibiger

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

publication ID 10.11646/zootaxa.2583.1.1

persistent identifier

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scientific name

Asytegumen absurdus Fibiger

new species

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.


Tavera, Department of Geology and Geophysics


Canadian National Collection of Insects, Arachnids, and Nematodes