Thubana spiniosa Park & Heppner, 2023

Park, Kyu-Tek & Heppner, John B., 2023, Review of the genera Thubana Walker and Torodora Meyrick (Lepidoptera: Lecithoceridae) from Sumatra, Indonesia, Zootaxa 5256 (5), pp. 434-456 : 439-441

Thubana spiniosa Park & Heppner , sp. nov.

LSID: urn:lsid:zoobank.org:act:9EB1F313-055D-47BD-8FEB-B1486FCFE63D

( Fig. 4 )

Type specimen. Holotype: Male, N. Sumatra, 43 km SW Pematang Siantar , ca. 1,200 m, 24–26 Aug 1992, J.B. Heppner & E.W. Diehl, gen. slide no. JBH-4149.

Diagnosis. The new species is superficially similar to T. ochracea Park & Abang, 2005 , which was described from Sarawak, Malaysia (holotype in KNA), especially the dark-brown ground color of both wings, but it can be distinguished by the more or less elliptical costal patch and the termen of both wings being very oblique, and the fringe with white scales narrow only between R 5 and M 2, whereas in T. ochracea the costal patch is quadrate, the termen is less oblique with the white fringe from beyond apex to middle of termen. The male genitalia differ from each other by the cucullus having a row of strong spines along the ventral margin, and the juxta with a large, triangular median plate (illustrated in Fig. 4D ).

Description. Male ( Figs 4A, B ). Wingspan 19.0 mm.

Head: frons shiny creamy white; vertex same color, mixed with brownish scales posteriorly, with orange-white erect scales laterally. Antenna longer than forewing, about 1.3 times; scape elongated, slightly broadened distally, brownish dorsally; flagellum yellowish white, with very weak annulations. Second segment of labial palpus ( Fig. 4C ) thickened, strongly arched and upturned, mustard brown on outer surface; 3rd segment slender, longer than 2nd segment, dark brown ventrally.

Thorax: tegula and thorax dark mustard brown, with some yellowish-white, long, erect scales laterally. Hind tibia with yellowish-white rough scales mixing with brownish scales dorsally. Forewing ground color dark mustard brown; costa nearly straight before 3/4; costal patch more or less elliptical, yellowish-white, just beyond middle, with three small, yellowish-white, short streaks before apex; apex obtuse; termen oblique; fringe with narrow, white basal line, with white scales narrowly between R 5 and M 2. Hindwing ground color same as that of forewing, without any markings; apex sharply produced; termen very oblique, slightly sinuate; fringe concolorous, but few white scales at M 1.

Abdomen: mustard brown on dorsal surface; spinous zones on tergites broadly developed; abdominal segments VI-VIII as shown in Fig. 4F .

Male genitalia ( Figs 4C, D ): Uncus slender, nearly parallel sided. Mesial process of gnathos relatively long, strongly bent beyond 2/3. Tegumen deeply concave on anterior margin Valva broad basally, narrowed at conjunction with cucullus; costa deeply concave before cucullus; cucullus thumb-like, densely setose, with a row of strong spines along outer margin; apex rounded. Juxta broad, short, with large, triangular mesial plate. Vinculum narrow, banded. Aedeagus shorter than valva, broad basally, with several conical spines in apical part dorsally; cornuti consisting of several short, sclerotized bars as in Fig 4E .

Female unknown.

Distribution. Indonesia (N. Sumatra).

Etymology. The specific name is derived from the Latin, spina (= spine) with Latin suffix, - osa, referring to the spines along the outer margin of valva in the male genitalia.

Figures

FIGURE 4. Thubana spiniosa Park & Heppner, sp. nov.: A, adult, holotype; B, head, dorsal view; C, head with labial palpus; D, male genitalia, slide no. JBH-4199; E, ditto, aedeagus; F, abdominal segments VII-VIII. Scale bar: 1.0 mm.