Thubana sumatrana 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 : 437-439

Thubana sumatrana Park & Heppner , sp. nov.

LSID: urn:lsid:zoobank.org:act:AB313B77-9C3F-436E-94EA-A0A3EB8A1189

( Figs 2 , 3 )

Type specimen. Holotype: Male, Indonesia, N. Sumatra, 43 km SW P[ematang] Siantar (HW 4[logging road 4]), 24–26 Aug. 1992, ca. 1,200 m, J.B. Heppner & E.W. Diehl, gen. slide no. CIS-6144.

Paratype: 1♀, N. Sumatra, 6 km N. Bungabondar, ca. 900 m, 28 Jul. 1993, J.B. Heppner, gen. slide no. CIS-6152 .

Diagnosis. The new species is superficially similar to T. apicularis Park & Heppner, 2009 , which was described from N. Sumatra (holotype in MGCL) by having a large, triangular orange-white costal patch on the forewing, but it can also be distinguished by the fringe with uniformly grayish brown band medially and apically, whereas in T. apicularis , the costal patch is more or less quadrate and the fringe has narrowly orange-white scales from beyond the apex to the end of M 2. The male genitalia can be distinguished by the uncus broadened apically (in T. apicularis , narrowly elongated); cucullus with gently arched outer margin and strongly upturned; the juxta with snake headshaped median plate (in T. aicularis , the median plate is triangular); saccal zone well-produced; and the aedeagus much slender and longer.

Description. Male ( Figs 2A, B ). Wingspan 14.0–15.0 mm.

Head: frons shiny creamy white; vertex same color with brownish scales posteriorly, and with some brownish erect scale laterally. Antenna longer than forewing; scape elongated, slightly broadened distally, yellowish white with brownish scales apically; flagellum yellowish white, without annulations. Second segment of labial palpus ( Fig. 2B ) thickened, arched, pale orange with dark-brown band in apical 1/5 on both surfaces; 3rd segment slender, longer than 2nd segment, dark brown ventrally.

Thorax: tegula and thorax mustard brown. Hind tibia with yellowish-white rough scales before median spurs, dark brown dorsally with yellowish-white apex. Forewing ground color mustard brown; costa with sub-basal blackish streak an orange-white streak before antemedian fascia; costal patch large, triangular, orange white, nearly reaching to inner margin; apex obtuse; termen oblique; fringe with uniformly grayish brown band medially and apically. Hindwing ground color same as that of forewing; apex sharply produced; termen very oblique, slightly sinuate.

Male genitalia ( Figs 3A–D ): Uncus slightly broadened apically, with round apex. Mesial process of gnathos broadened basally, strongly bent beyond 2/3 downward. Valva broad with nearly parallel sided; costa nearly straight to basal 2/3, with slightly arched sub-marginal line below coastal margin in basal 2/3; cucullus not clearly divided with basal part of valva, with gently arched ventral margin. Juxta broad with large, snake head–shaped mesial process. Vinculum band-shaped, with sharply pointed apices; saccal zone well-produced. Aedeagus slender, broadened basally, longer than valva; cornutus absent.

Female genitalia ( Figs 2C–E ): Abdominal sternite VIII deeply emarginated into V-shape at middle. Apophyses anteriores short, about half the length of apophyses posteriores. Pregenital plate of sternite VII heavily sclerotized, more or less triangular with linear lateral arms and anterior processes. Antrum weakly developed, membranous. Ductus bursae extremely long, broadened in distal 1/10, then coiled more than 10 times. Corpus bursae pear-shaped; signum with ovate plate with numerous spinules.

Distribution. Indonesia (N. Sumatra).

Etymology. The species is named after the type locality, Sumatra.

Figures

FIGURE 2. Thubana sumatrana Park & Heppner, sp. nov.:A, adult, male, holotype; B, ditto, labial palpus, in lateral view; C, female genitalia,slideno.CIS-6152;D,close-upabdominalsegmentVIIIandsubgenitalplate;E,close-upsignum.Scalebar:1.0mm

FIGURE 3. Thubana sumatrana Park & Heppner, sp. nov.: A, male genitalia, slide no. CIS-6144; B, ditto, aedeagus; C, closeup uncus+gnathos; D, close-up vinculum+juxta. Scale bar: 1.0 mm.