Udea plumbalis (Zerny, 1914) Zerny, 1914

Mally, Richard, Huemer, Peter & Nuss, Matthias, 2018, Deep intraspecific DNA barcode splits and hybridisation in the Udeaalpinalis group (Insecta, Lepidoptera, Crambidae) - an integrative revision, ZooKeys 746, pp. 51-90 : 74

Udea plumbalis (Zerny, 1914) stat. n. Figs 6, 21-22, 42-44

Pyrausta austriacalis v. plumbalis Zerny, 1914: 335.

Type locality.

Mongolia, Khövsgöl Province, eastern Sayan mountains, Darhad basin, Arsain Gol river.

Material examined.

Type specimen. Holotype ♂ "Arasagun-gol | Sajan", "Stgr. | [handwritten] 1914", [handwritten] "Pyrausta | plumbealis B.H.iL.", [handwritten] "P. austriacalis | v. plumbalis | Zerny ♂ [in red] Type", Mally prep. no. 1083 (NMW). - Additional material. MONGOLIA. 1♂ "Arasagun-gol | Sajan", [handwritten] "Pyrausta | Plumbealis | [crossed out “Juldus”] BH.", Mally prep. no. 1094 (ZMHB).

Diagnosis.

Udea plumbalis can be confused with U. juldusalis , U. uliginosalis , U. uralica and untypically maculated specimens of U. alpinalis (see Fig. 4 in Panigaj and Kulfan 2012). It differs from U. uliginosalis in the minute proximal outer spur of the hindleg, which is well developed in U. uliginosalis ; furthermore, U. uliginosalis has a large hooked spine on the posterior phallus apodeme, while U. plumbalis has a small dentate ridge-like process. In U. alpinalis , the forewing apex is more acute and the hindwings have a white inner area (with a more or less broad brown area along the dorsum, sometimes occupying the majority of the inner wing area) contrasted with a clear dark-brown terminal band along the termen, whereas in U. plumbalis the hingwings’ dorsal side is evenly brown (Fig. 19), and on the ventral side the inner wing area is only faintly lighter than the subterminal band (Fig. 20). Udea juldusalis has lighter, narrower, and more acute fore- and hindwings in the male, and the hindwings’ inner area is lighter. Udea plumbalis is distinguished from U. uralica by the rounded apex and dark fringe in the forewing of males, and by the absence of a prominent bulge in the centre of the ventral valva edge (compare Slamka 2013, pl. 27 fig. 129); it is not clear whether this bulge on the ventral valva edge or its absence is a reliable character to distinguish the two species; the length of the hindlegs’ proximal outer spur in comparison to the proximal inner spur is not known for U. uralica .

Redescription.

Head. As for U. austriacalis , apart from: frons and vertex with greyish brown scales; proboscis base covered in brown and greyish scales; labial palps directed forward, dirty- to cream white, distal half of the outside greyish brown; maxillary palps brown on outside, cream white on the inside; dorsal side of antennae with line of metallic brown scaling; antennal length approx. 60 % of forewing length in males, females unknown.

Thorax. As for U. austriacalis , apart from: greyish brown thorax; front legs and inner side of mid- and hindlegs cream-white, side of mid- and hindlegs pale brownish with many cream-white scales intermixed; hindleg proximal outer spur minute, inner spur the longest one on the hindleg, distal outer spur ca. 80% the length of the inner spur.

Wings. Forewing length 12-13 mm in males, females unknown. Males with one frenulum bristle. Forewing dorsal side dirty pale brown, distal of the postmedial line brown-grey to dirty greyish. Maculation absent apart from a more or less prominent oval whitish area basal of the postmedial line on the M veins. Area between costa and cell and veins encircling the cell somewhat darker brown. Slim band along outer wing margin consisting of three thin brown lines alternated with two thin pale yellowish brown lines; distal fringe pale white. Hindwing pale brown, apical area somewhat darker; outer wing margin with thin bands as in forewing, outermost band somewhat fainter. Ventral side of forewing uniformly brown, costa blended with darker brown and greyish scales and with a thin whitish line running in parallel on the length of the cell; distal end of cell with a faint darker brown arc; subterminal area slightly darker; dirty greyish brown area on wing apex, running along outer wing margin, narrowing towards posterior end of termen; outer wing margin and fringe as on dorsal side. Ventral side of hindwing dirty brownish grey with a more or less prominent broad pale brown subterminal band; outer wing margin and fringe as on dorsal side.

Abdomen. As for U. austriacalis , apart from: abdomen brownish grey, distal segment margins on dorsal side and scales on terminal segment pale yellow.

Male genitalia. (Figs 42-44) As for U. austriacalis , apart from: juxta rhombical to broad drop-shaped, apex sharply bifid with a narrow V-shaped medial incision 20-25% of the juxta length; Valva long, relatively broad to slim, slightly tapering towards apex; costa concave, central costa somewhat narrowed, costa surface sparsely studded with thin long simple setae; sacculus broad, roughly rectangular, dorsodistal edge close to fibula base, ventrodistal part concavely curving towards ventral valva edge; ventral valva edge straight to convex, with or without a slight bulge in the area where the fibula is pointing to; fibula elongate, apically tapering, strongly sclerotised, directed towards the distal sacculus, dorsal fibula edge inflated to a narrow tube, apical half narrowed to a pointed, ventrad curved claw, ventral side of claw with flat surface; right posterior phallus apodeme forming a sclerotised spatulate lobe with a central raised ridge bearing two to three small, laterally protruding teeth at its posterior end.

Female genitalia.

Unknown.

Immature stages.

Unknown.

Distribution.

So far only known from the eastern Sayan mountains in the Khövsgöl Province in N Mongolia (Fig. 6).

Food plants.

Unknown.

DNA data.

No data available.