Nemophora sumbana Kozlov, 2024

Kozlov, Mikhail V., 2024, Description of six new species forming the sumbana species group of the genus Nemophora Hoffmannsegg (Lepidoptera, Adelidae) from the Lesser Sunda Islands in Indonesia, Zootaxa 5543 (1), pp. 111-122 : 113-115

Nemophora sumbana Kozlov , sp. nov.

urn:lsid:zoobank.org:act:C3D8CCC3-EFFB-4E0B-A6A2-DDC74B34DED6

( Figs. 1 , 9 , 15 )

Holotype ♂: Indonesia, Sumba Island , Pogobina (9º 36’ S, 119º 25’ E); labelled: 8 mm circle with red border, print ‘ Holo- │ type’; 6 × 14 mm, print ‘W. Sumba, 500 m │ Pogobina, ix 1949 │ Sutter & Wegner’; 6 × 18 mm, print ‘ HOLOTYPE ♂ │ Nemophora │ sumbana Kozlov’ ( RMNH) [examined] . Paratypes. 4 ♂, labelled: 8 mm circle with yellow border, print ‘ Para- │ type’; 6 × 14 mm, print ‘W. Sumba, 500 m │ Pogobina, ix 1949 │ Sutter & Wegner’. 2 ♂, labelled: 6 × 14 mm, print ‘W. Sumba, 500 m │ Pogobina, ix 1949 │ Sutter & Wegner’. 1 ♂, labelled: 9 × 13 mm, print ‘[K. W.] Dammerman [leg.] │ O. Soemba │ 450 M. │ Mao Marroe │ V. 1925 ’. All paratypes bear the label: 6 × 18 mm, print ‘ PARATYPE ♂ │ Nemophora │ sumbana Kozlov’ (all in RMNH) [examined] .

Diagnosis. Nemophora sumbana differs from other species in the sumbana group by its large size, the extremely oblique external border of the basal field on the forewing (reaching the costa at 0.4 and the dorsum at 0.2 × FWL), the spot at the outer wing margin that does not reach the forewing apex, and relatively short labial palpi (0.3‒0.4 × vertical eye diameter). In male genitalia, N. sumbana is very similar to N. umbronitidella ( Figs. 3, 4 ), from which it differs by the smaller medial process of the transtilla, the shape of the anellus, and the relatively thick and straight tip of the phallus.

Description. Male ( Fig. 1 ). FWL 6.6‒7.5 mm, WLR 0.35‒0.40. Vertex bright ochreous; frons glossy golden. PLB 0.3‒0.4 × vertical eye diameter, ochreous brown, with sparse raised ochreous brown piliform scales. Proboscis light brown, base anterolaterally with dense tuft of long and wide dark brown scales. Eyes enlarged, but not touching each other; interocular index 1.3‒1.5; occipital distance 0.05‒0.10. Antenna 3.0‒3.9 × FWL. Scape and basal 5‒8 flagellomeres ochreous brown, dorsally slightly thickened by ochreous scales; then colour of flagellum sharply changes to dark coppery brown, with irregular white marks on lateral sides of some flagellomeres; these marks never form complete rings. At about middle of flagellum its colour steadily changes to bronze, and apical 5‒15 flagellomeres are white in some specimens. Tegulae and thorax brown to bronze; tegulae with brassy green tint. Forewing ( Fig. 9 ) bronze, with ochreous pattern. Basal field with three glossy bronze longitudinal stripes; costal silver stripe reaches 0.30–0.35 × FWL; external border of basal field oblique, reaching costa at 0.4 and dorsum at 0.2 × FWL. Oblique band next to basal field of about same width at costa and dorsum, of same ochreous colour as forewing base, except for narrow glossy bronze marginal lines. Oblique ochreous band linking costa with outer wing margin bordered by dotted narrow line of dark brown scales; its dorsal part extends along outer wing margin only towards wing base. Bronze background of distal part of forewing suffused with yellow scales, which form diffuse spot along external border of oblique ochreous band. Fringe bronze. Hindwing brown, with coppery tint; costal area yellowish grey; fringe brown. Legs glossy bronze to yellow; apices of tibiae and all tarsomeres brown. Epiphysis at 0.55, not reaching apex of tibia. Abdomen brown to bronze.

Female unknown.

Male genitalia ( Fig. 15 ). Tegumen dome-shaped, with small medial ridge. Socii 1.6 × medial diameter of phallus. Vinculum 2.8 × length of valva, with slightly convex lateral margins and nearly straight distal margin with small medial protuberance. Tips of valvae at about same level as tip of tegumen. Ventral margin of valva with small lobe at 0.5 × total length; dorsal valvar margin almost straight; tip of valva rounded. Valvae fused basally up to 0.3 × total length; internal valvar margins indistinct. Anellus 0.25 × length of valva. Transtilla with small triangular medial process. Juxta 0.55 × length of phallus, anchor-shaped; arrow head extremely wide (WLR 1.3), with rounded tip and pointed lateral arms. Phallus 0.90‒0.95 × length of vinculum, in lateral view gently S-shaped; base of phallus narrowly bell-shaped, tip pointed.

Distribution. Indonesia, Sumba Island.

Etymology. The species is named after the type locality, Sumba Island.

Figures

FIGURES 1–8. Adults of Nemophora spp. 1, N. sumbana Kozlov, sp. nov., male, holotype, from Pogobina, Sumba Island, Indonesia; 2, N. timorella Kozlov, sp. nov., male, paratype, from Timor Island, Indonesia; 3, N. umbronitidella Kozlov, sp. nov., male, paratype, from Sumbawa Island, Indonesia; 4, ditto, female, paratype, from the same locality; 5, N. wegneri Kozlov, sp. nov., male, holotype, from Mao Marroe, Sumba Island, Indonesia; 6, ditto, female, paratype, from Pogobina, Sumba Island, Indonesia; 7, N. longipeniculella Kozlov, sp. nov., female, paratype, from Bali Island, Indonesia; 8, N. brevipeniculella Kozlov, sp. nov., female, holotype, from Timor Island, Indonesia. Scale bar: 2 mm.

FIGURES 9–14. Forewing pattern of Nemophora spp. 9, N. sumbana Kozlov, sp. nov.; 10, N. timorella Kozlov, sp. nov.; 11, N. umbronitidella Kozlov, sp. nov.; 12, N. wegneri Kozlov, sp. nov.; 13, N. longipeniculella Kozlov, sp. nov.; 14, N. brevipeniculella Kozlov, sp. nov. Scale bar: 2 mm.

FIGURES 15–18. Male genitalia of Nemophora spp. 15, N. sumbana Kozlov, sp. nov.; 16, N. timorella Kozlov, sp. nov.; 17, N. umbronitidella Kozlov, sp. nov.; 18, N. wegneri Kozlov, sp. nov.; a: genital complex, ventral view (right valva not shown); b: genital complex, lateral view; c: juxta; d: phallus, ventral view; e: phallus, lateral view. Scale bar: 0.2 mm.