Meleonoma fornicalis Wang, 2020

Wang, Shuxia & Tao, Zhulin, 2020, The genus Meleonoma Meyrick (Lepidoptera: Autostichidae) from Thailand, Zootaxa 4801 (2), pp. 383-388 : 385-387

Meleonoma fornicalis Wang , sp. nov.

( Figs 2 , 4, 5 )

Type material. Holotype ♂, Khao Yai National Park (12°49′N, 99°56′E), Nakhon Nayok, Thailand, 700 m, 29.IX−6. X.1984, leg. Karsholt, slide No. ZMUC-NK034 . Paratypes: 1♂, 1♀, same data as holotype, slide Nos. ZMUC- NK043 ♀, ZMUC-NK055 ♂ ( ZMUC) .

Diagnosis. This new species can be distinguished from its congeners in the male genitalia by the costa distally produced to a dome-shaped process, and the valva with a slender digitate process arising from above basal 1/5 of the ventral margin. It is similar to M. falsitorophanes ( Wang, 2006) in both appearance and genitalia, but can be distinguished in the male genitalia by the valva obtuse at apex, and the sacculus reaching 2/5 length of the ventral margin of the valva, and in the female genitalia by the corpus bursae with two signa. In M. falsitorophanes , the apex of the valva is concave above the ventroapical corner, and the sacculus extends to half length of the ventral margin of the valva; and the corpus bursae lacks a signum.

Description. Adult ( Fig. 2 ). Wingspan 9.0−10.0 mm, length approximately 3.2 times of maximum width.

Head with vertex and neck deep brown, with yellow scales laterally; frons yellow. Labial palpus yellow; second segment with a blackish brown ring at apex; third segment shorter than second segment, with sparse brown scales. Antenna blackish brown, flagellum annulated with yellow on ventral surface.

Thorax and tegula blackish brown, with sparse yellow scales laterally and apically. Forewing blackish brown, mixed with yellow at base; costal margin arched, apex pointed; median fascia yellow, from middle of costal margin obliquely outward to before tornus, slightly widened posteriorly; costal spot at about distal 1/4, yellow, inverted triangular; black dots at middle of cell and fold respectively, placed on inner margin of median fascia; fringe blackish brown. Hindwing and fringe greyish brown. Legs yellow, coxae and femora with dense blackish brown on ventral surface, tibiae greyish brown on outer surface, tarsi blackish brown on outer surface except yellow at apex of each tarsomere.

Male genitalia ( Fig. 4 ). Uncus weakly sclerotized, tapered, with dense short setae. Tegumen inverted V shaped, finely narrowed at middle; lateral arm widened anteriorly. Valva sub-ovate, narrowed at base, widened ventrad medially, then narrowed to obtuse apex; ventral margin straight along basal 2/5, obtuse along distal 3/5, with a slender digitate process above basal 1/5, densely setose; costa wide, reaching distal 1/3 of valva, produced to a large domeshaped process distally. Sacculus sub-rectangular, dorsoapically produced to a short mound-shaped process with long setae apically. Saccus triangular, rounded at apex; longer than uncus. Juxta V shaped. Phallus slightly longer than valva, slender, arched medially, produced to a hook distally.

Female genitalia ( Fig. 5 ). Papillae anales sub-cylindrical, narrowly rounded on posterior margin, with dense short setae on dorsal surface. Apophyses anteriores approximately half length of apophyses posteriores. Lamella postvaginalis composed of two narrow elliptical plates, with long setae along posterior margin. Lamella antevaginalis crescent. Ductus bursae with posterior 3/5 sclerotized, anterior 2/5 membranous; ductus seminalis from anterior 1/3 of ductus bursae. Corpus bursae ovate; two signa placed anteriorly: one large, rounded, with dense teeth, another below first one, being a very small plate with a few teeth.

Distribution. Thailand (Nakhon Nayok).

Etymology. The specific epithet is derived from the Latin fornicalis , referring to the dome-shaped process of the costa.

Figures

FIGURES 1‒2. Adults of Meleonoma spp. 1, M. segregacantha sp. nov., holotype ♂; 2, M. fornicalis sp. nov., holotype ♂. Scales = 2 mm.

FIGURES 3‒5. 3, M. segregacantha sp. nov., male genitalia, slide No. ZMUC-NK048; 4‒5, M. fornicalis sp. nov. 4, male genitalia, slide No. ZMUC-NK034; 5, female genitalia, slide No. ZMUC-NK043. Scales = 0.2 mm.