Meleonoma annulignatha, Wang & Zhu, 2020

Wang, Shuxia & Zhu, Xiaoju, 2020, Study of the genus Meleonoma Meyrick, 1914 (Lepidoptera: Autostichidae) from China, with descriptions of twenty-one new species (II), Zootaxa 4881 (2), pp. 257-289 : 279-280

Meleonoma annulignatha sp. nov.

( Figs 21 , 43 , 54 )

urn:lsid:zoobank.org:act:6B7DB269-4C2B-45E4-B9E6-E99CD3F8FE03

Type material. CHINA, Guangxi: Holotype ♂, Mt. Daming (23.40°N, 108.50°E) , 1250 m, 24. V .2011, leg. LL Yang & YH Mou, slide No. ZXJ19134 ( NKU) . Paratypes: 6♂ 1♀, 21–29. V .2011 , other same data as holotype, slide No. YAH12313 ♀ ( NKU).

Diagnosis. The new species is similar to M. taiwanensis sp. nov. and M. bifoliolata (Wang, 2006) in the male genitalia. It can be distinguished by the costa with a setose rectangular process near base, the sacculus dorsodistally produced to a digitate process, and the aedeagus with two horn-shaped apical processes. In M. taiwanensis , the costa has an widely banded process from basal 1/3, the sacculus is dorsally produced to a narrow triangular process, and the aedeagus lacks horn-shaped processes but has two stout apical spines; in M. bifoliolata , the costa has a bandshaped process near base, the sacculus has a sub-rounded process dorsally, and the aedeagus lacks horn-shaped processes ( Wang 2006a: 16, fig. 8).

Description. Adult ( Fig. 21 ). Forewing length 8.5‾9.0 mm.

Head yellow. Labial palpus yellow; second segment with blackish-grey scales, denser in distal 1/3; third segment about 3/4 length of second segment, with a black dot at distal 1/3 on dorsal surface. Antenna with scape yellow, blackish grey on anterior and posterior margins; flagellum black alternated with greyish brown except basal several flagellomeres yellow alternated with black on dorsal surface, yellow alternated with blackish grey on ventral surface.

Thorax and tegula greyish black. Forewing greyish black; costal margin with an ill-defined yellow spot at middle and near apex respectively, indistinct in some individuals; dorsum with a distinct round yellow spot before end of fold, reaching below posterior margin of cell; fringe concolourous with wing. Hindwing and fringe pale greyish black. Legs yellow; on ventral surface, foreleg blackish brown, tibia with a yellow dot at middle and at apex respectively, tarsus yellow at apices of basal two tarsomeres, femora of mid- and hindlegs with blackish-brown scales, mid tibia yellow apically, mid tarsus yellow at apices of basal two tarsomeres, hind tibia greyish black, yellowish white apically, hind tarsus with basal four tarsomeres blackish brown except yellow at apices.

Male genitalia ( Fig. 43 ). Uncus wide at base, distinctly narrowed to basal 3/4, parallel from distal 1/4 to bifurcate apex, with an elongately triangular ridge on dorsal surface. Gnathos annular, widely and evenly banded, joined anteromedially. Tegumen widened medially, concave in broad V-shape on anterior margin; lateral arm narrowed anteriorly. Valva parallel from base to before middle, widened at middle, thereafter narrowed to rounded apex, with dense setae in ventral area; ventral margin convex prominently at middle, forming a large obtuse angle; costa arched, with a short setose rectangular process at basal 1/4, with a wide ribbon-like process from inner side of its base ex-tending obliquely downward and narrowly joined at middle by membrane. Sacculus sub-quadrate; apex broadly and shallowly concave, produced to an elongate digitate process dorsally and to a short sub-triangular process ventrally. Saccus wide basally, sub-parallel to before rounded apex distally. Juxta U-shaped. Aedeagus 1.5 times as long as valva, basal half uniformly narrow, distal half dilated to before apex; apex with two large horn-shaped processes; with two short, tooth-shaped cornuti, placed medially.

Female genitalia ( Fig. 54 ). Papillae anales sub-ovate, with dense long setae. Apophyses posteriores twice as long as apophyses anteriores. Eighth sternal plate narrow, posterior margin concave quadrately at middle, forming two elongate sub-rectangular lateral plates. Ostium bursae widely open. Lamella antevaginalis sub-rectangular, shallowly concave on posterior margin on ventral surface; narrowly banded and weakly sclerotized medially, produced to a large process laterally on dorsal surface. Ductus bursae membranous, granulate. Corpus bursae rounded, granulate, slightly longer than ductus bursae.

Distribution. China (Guangxi).

Etymology. The specific epithet is derived from the Latin annuli- and gnathus, referring to the shape of the gnathos in the male genitalia.

Figures

FIGURES 21–24. Adults of Meleonoma spp. 21. M. annulignatha sp. nov., ♂; 22. M. artivalva sp. nov., ♂; 23. M. sinuicosta sp. nov., ♂; 24. M. taiwanensis sp. nov., ♂. All holotypes. Scales = 5.0 mm.

FIGURES 43–46. Male genitalia of Meleonoma spp. 43. M. annulignatha sp. nov., holotype, slide No. ZXJ19134; 44. M. artivalva sp. nov., paratype, slide No. YAH15299; 45. M. sinuicosta sp. nov., holotype, slide No. YAH15285; 46. M. taiwanensis sp. nov., holotype, slide No. MNHU-NK110. Scales = 0.5 mm.

FIGURES 52–56. Female genitalia of Meleonoma spp. 52, M. segregnatha sp. nov., slide No. ZXJ19163, 52a, enlarged view of signum; 53, M. taeniophylla sp. nov., slide No. ZXJ19223; 54. M. annulignatha sp. nov., slide No. YAH12313; 55. M. artivalva sp. nov., slide No. YAH15296; 56. M. taiwanensis sp. nov., slide No. MNHU-NK111. All paratypes. Scales = 0.5 mm, except 52a = 0.1 mm.