Sinarella jinggangshana sp. nov.

Materials

Type status: Holotype. Occurrence: recordedBy: Hui-Lin Han, Jun Wu; sex: male; lifeStage: adult; disposition: in NEFU; occurrenceID: A7C2447F-812C-541F-B61D-C1025C0B9CF1; Location: country: China; stateProvince: Jiangxi; county: Ji'an; locality: Jinggangshan National Nature Reserve, Liujiaping Village; Event: eventDate: 26–29 Aug 2023

Type status: Paratype. Occurrence: recordedBy: Hui-Lin Han; individualCount: 1; sex: male; lifeStage: adult; disposition: in NEFU; occurrenceID: FFF89B67-4F27-5AFE-BD55-99E3BAE459D1; Location: country: China; stateProvince: Jiangxi; county: Ji'an; locality: Jinggangshan National Nature Reserve, Liujiaping Village; Event: eventDate: 3–9 Aug 2021

Description

Male (Fig. 1 a, b). Forewing length 9.5 mm, wingspan 20 mm in male. Head grey-white. Male antennae filiform, with a pair of long bristles on each segment. Labial palpus elongated, extending forwards, grey-white with black scales, third segment mostly black. Thorax and abdomen grey-white, sparsely mixed with black scales. Forewings broad, predominantly grey-white with a tinge of ochre, mixed with black scales; terminal area and fringe grey-brown; basal line black, only obvious towards costal margin; antemedial line sinuous, excurved; postmedial line black, dentate, prominently excurved in middle, with a faint ochreous shade along inner edge in posterior half; subterminal line nearly straight, dentate, inconspicuous, but forming 1–2 distinct black spots near R and R veins; terminal line consisting of elongate black dots. Orbicular spot barely discernible; reniform spot conspicuous, black with a grey-white mark in it, circular, very large. Fringe grey-brown, black-tipped. Hind-wings pale grey-white, with a dark grey-brown marginal shade; discal spot indistinct; median line dark brown, dentate, slightly excurved; subterminal line dark brown, straight, visible only in posterior two-thirds, embedded with a narrow bright band on its outer side; short black stripes present between each vein on terminal line. Fringe dark brown mixed with black.

Male genitalia (Fig. 2 a, b). Uncus slender, with a single inward-curved small spine at tip. Tegumen broad, smoothly excurved on lateral margins and slightly concaved on upper margins. Transtilla elbow-shaped, pointed apically. Juxta shield-shaped, slightly sclerotised, membranous on sides in middle and lower parts. Valva narrow, elongated, more or less gradually narrowing towards distal end; costa with a lobe-like process basally, a strongly sclerotised, thorn-shaped process at 3 / 5 from base and specialised into a large, roughly equilateral triangular-shaped lobe at tip; sacculus slightly enlarged at basal part, then slightly waved, covered with long hairs; cucullus bluntly rounded. Vinculum V-shaped, blunt at distal part. Aedeagus slender, with a near-right angle bend near middle, vesica membranous, long, nearly as long as aedeagus, densely covered with small scobinations; vesica bears two areas of strongly sclerotised conical cornuti arising tightly basally, first one on ventral side formed by a row of short, stout conical cornuti and the other one on dorsal side single, long, large and horn-like.

Female. Unknown.

Diagnosis

The new species (Fig. 1 a, b) is easily distinguishable from its close congeners (Fig. 1 c, d, e, f) by external and male genitalia characters: (1) S. jinggangshana sp. nov. exhibits an overall grey-white colouration, whereas its close relatives are darker, often sandy-yellow or brownish; (2) the postmedial line of the new species is slender near the costal margin, whereas in S. takasago Wu, Fu & Owada, 2013 (Fig. 1 c) and S. cristulalis (Fig. 1 d), it expands into a black spot at the same position; in S. formosensis (Fig. 1 e), the postmedial line is thinner than that of S. jinggangshana and, in S. japonica (Fig. 1 f), it narrows towards the costal margin; (3) the subterminal line is indistinct in S. jinggangshana sp. nov. and S. japonica, while it is clear in other species.

In the male genitalia, S. jinggangshana sp. nov. (Fig. 2 a, b) can be distinguished from close congeners (Fig. 2 c, d, e, f) by the following characters: (4) the shape of the proximal margin of the tegumen, which has triangular projections from the proximal corners in S. jinggangshana sp. nov., whereas the others lack such projections; (5) the terminal part of the costa with a large, wide triangular projection in the new species, whereas the same structure typically is present in a spiny form in congeners excluding S. japonica, which also have a triangular projection, just without the extended round distal margin of the terminal part of the costa like in the new species; (6) the aedeagus is slender, with a nearly right angle bend near the median in S. jinggangshana sp. nov., whereas it is shorter, thicker and either not bent or only slightly bent in congeners.

Etymology

The specific name is derived from Jinggangshan National Nature Reserve in Jiangxi Province, China, which is the type locality of the new species.

Distribution

China: Jiangxi.

Biology

The two type specimens were collected in August at altitudes ca. 706 m. The collection site is close to a mixed coniferous and broad-leaved forest, with farmland surrounding it. During the collection period, the area experienced high humidity, frequent rainfall and relatively high temperatures. The immature stages are still unknown.