Disca arborita, Fibiger, 2007

Fibiger, Michael, 2007, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea). Part 1, Taxonomy of the Pollexinae, Zootaxa 1567 (1), pp. 1-116 : 34-35

Disca arborita Fibiger, new species

( Plate 4 , figure 3; male genit. plate15, figure 2, female genit. plate 23, figure 1)

Material examined.

Holotype: male, Indonesia, Sumatra W, Lake Maninjau , 20 km S Maninjau, 480 m, 00°23’46” S 100°12’53” E, 20.ii.2002, leg. M. Fibiger. Coll. M.F, to be deposited in ZMUC.

Paratypes: 5 males, 1 female: 1 male with data as holotype ; 3 males, 1 female, Indonesia, Sumatra W, Bukittinggi , 980 m, 00°15’30 S 100°21’13 E, 19-23.ii.2002, leg., and genit. preps 4515 (male) 4516 (female) M. Fibiger. Coll. MF . 1 male, [ Indonesia, Sumatra West, by Padang], Indarung by Padang , 9.xi.1948, leg. F. A. Hanedoes, genit. prep. 3911 M. Fibiger. Coll. RMNB .

Diagnosis.

Wingspan: 11–12 mm.

Forewing: relatively broad.

Hindwing: termen slightly convex.

Transverse lines: brown; antemedial and postmedial lines weakly marked; basal, antemedial, postmedial, and subterminal lines well marked by a black spot by costa; terminal line marked by black, elongated dots. Reniform: elongated, brown.

Hindwing: light brown.

Underside: unicolorous light brown.

Abdomen: brown, without long anal tufts.

Male genitalia.

Saccus: short, rounded.

Vinculum: short.

Tegumen: long.

Tergite and sternite: indistinct.

Costa: almost straight.

Sacculus: narrow, short.

Ampulla: slightly asymmetrical, ovoid, apically smoothly rounded.

Pollex : short and heavily fused to clasper, with long hair-like setae.

Digitus: asymmetrical; relatively short, bent; right digitus much longer and stouter than left one.

Juxta: higher than wide.

Anellus: dorsally fused with juxta.

Phallus: long and narrow, broadest by ductus ejaculatorius, slightly tapered, bent at 2/3; coecum relatively long and rounded apically.

Female genitalia.

Ovipositor: quadrangular.

Anterior apophyses: shorter than posterior apophyses.

8 th abdominal segment: very narrow, ventrally fused with the 7 th segment.

7 th abdominal segment: heavily sclerotised; position of ostium slightly posterior to middle of segment; without processes or pouches.

6 th segment: posterior part of segment heavily sclerotised and fused with 7 th segment; other part of 6 th segment less heavily sclerotised – similar to rest of abdomen.

Antrum: short, tapered, slightly longer than wide.

Ductus bursae: membranous, 1½ X as long as corpus bursae.

Appendix bursae: arises at posterior end of ductus bursae.

Corpus bursae: relatively large and globular.

Differential diagnosis.

The male genitalia of D. arborita are similar to those of D. javai , D. hackeri , and D. thailandi but differ in having a less rounded ampulla; that of D. thailandi is slightly more elongated; the left and right digiti of D. arborita are longer than those of D. javai and D. thailandi , but smaller than those of D. hackeri . The angle of the bend of the phallus is slightly wider than 100°, like that of D. hackeri , whereas those of the two others are 95° and 100° degrees, respectively. In the female genitalia the antrum is slightly longer than that of D. javai ; those of D. tegali , D. paulum , and D. thailandi have much longer antra.

Figures

PLATE 4. Figures 1–8. Tolpia and Disca species, adults. 1, T. knudlarseni, male holotype, Indonesia, Sumatra N, between Pematang Siantar and Tigadoluk; 2, D. javai, male holotype, Indonesia, Java W, Djakarta; 3, D. arborita, male holotype, Indonesia, Sumatra W, Lake Maninjau; 4, D. parajavai, female holotype, Indonesia, Sumatra N, Huta Padang; 5, D. tegali, female holotype, Indonesia, Java, Tegal; 6, D. paulum, female holotype, Thailand mid W, Kanchannaburi; 7, 8, D. thailandi, Thailand, male holotype, Thailand mid W, Kanchannaburi, and female paratype, Thailand S, Phuket.