Dryadaula flavostriata, Yang & Li, 2021

Yang, Lin-Lin & Li, Hou-Hun, 2021, The genus Dryadaula Meyrick (Lepidoptera, Tineoidea, Dryadaulidae) in China, with descriptions of four new species and a world checklist, ZooKeys 1074, pp. 61-81 : 61

Dryadaula flavostriata sp. nov.

Figures 2 , 8

Type material.

Holotype: China: • ♂; Guangxi Province, Nanning City, Mt. Daming (23°24'N, 108°30'E); alt. 1250 m; 23.v.2011; leg. Linlin Yang & Yinghui Mou; genitalia slide No. YLL11112.

Differential diagnosis.

Dryadaula flavostriata sp. nov. is similar to D. caucasica (Zagulajev, 1970), but differs from it by the forewing peppered with more ochreous yellow scales that form stripes between fold and dorsum; the male genitalia with short uncus that is equipped with a rectangular process at the left and the sub-oval left valva with processes of different shapes, not bearing thorns or long bristles. In D. caucasica , the forewing has dark grey-brown longitudinal stripes between fold and dorsum; in the male genitalia, the elongate uncus has no process and the fluted left valva has dense, long bristles along outer ventral margin and a globular sclerotisation which is densely thorned.

Description.

Adult (Fig. 2 ): Wingspan 11.5 mm in holotype. Vertex and frons yellowish-white. Antenna with scape brightly white, margined with black anteriorly; flagellum with dorsal surface alternating black and white in basal 1/3, black in medial 1/3, alternating black and white every two annuli in distal 1/3, ventral surface white in basal 2/3, alternating black and white every two annuli in distal 1/3. Labial palpus spatulate; first palpomere black, second palpomere white on inner surface, black on outer surface; third palpomere white tinged ochreous yellow, with a black dot at middle of outer surface. Thorax and tegula blackish-brown in anterior 1/2, brightly white tinged with blackish-brown in posterior 1/2. Forewing brightly white, with scattered grey and black scales; patterned with black markings that are bordered with ochreous yellow and ochreous yellow markings that are tinged with black: costa with a wedge-shaped spot at base, a semicircular spot at 1/3, a semicircular patch at 3/4 and an arc line at apex, diffused greyish-black smudges amongst spots; cell with a narrowed, oval spot at distal 1/4, suffused with ochreous yellow anterolaterally, tending to coalesce with semicircular costal patch; fold with irregular ochreous yellow stripes at base, basal 1/3 and 2/3, tinged with black, obliquely inwards towards dorsum; four or five black dots from apex to tornus along termen, forming a broken terminal line; cilia white in basal 1/2, grey in distal 1/2. Hind-wing and cilia dark grey. Foreleg dark grey, tarsus yellowish-white on inner surface; mid-leg femur greyish-black on outer surface, pale yellow on inner surface, tibia and tarsomeres yellowish-white at end; hind-leg yellowish-white on inner and ventral surface, tibia grey on outer and dorsal surface, tarsus greyish-black on outer and dorsal surface, yellowish-white at end of each tarsomere.

Male genitalia (Fig. 8 ). Uncus lobes fused into a shield, bearing long hairs dorsally, slightly concave at middle on posterior margin, asymmetrical, left lobe slightly longer than right, with a smooth rectangular process. Subscaphium not developed. Tegumen simple, forming a narrow ring with vinculum. Vinculum broad, posterior margin strongly sclerotised, with a setose lobe at right. Saccus subtriangular, asymmetrical. A complicated, irregular, sclerotised modification attached to vinculum anteriorly, possibly part of segments VII and VIII; its left part somewhat triangular, right part chestnut-shaped. Sternum VIII articulated with vinculum at left, articulated with left valva dorso-basally, strongly modified into a large pocket, broadly rounded apically, with a large hammer-like process at middle, with a tuft of non-deciduous hairs. Valvae strongly asymmetrical. Left valva larger than right one, sub-oval; costal margin with a broad, vertical bridge at middle, a digitate process at distal 1/3, a larger subrectangular process at 1/6, a slender, curved process at end that is about 2/3 length of valva, with a setose fan-shaped lobe at middle; ventral margin with an oblique, digitate process at middle and a horned process at end. Right valva divided into two parts: dorsal lobe large, vaulted, with a finger-like process apically and a slender, decurved, setose lobe at middle; ventral lobe digitate, hooked apically. Juxta inflated and rounded, with a U-shaped process on left, an arced band on right. Aedeagus as long as saccus, simple, expanded in basal 1/4, sinuate in S-shape in distal 3/4; cornutus absent.

Female. Unknown.

Distribution.

China (Guangxi).

Etymology.

The specific name is derived from the Latin prefix flav -, meaning yellowish and the Latin word striatus, stripe, referring to the forewing with inwardly oblique ochreous yellow stripes between fold and dorsum.

Figures

Figures 1 - 4. Adults of Dryadaula species 1 Dryadaula auriformis sp. nov., male holotype 1 a lateral view of head 2 D. flavostriata sp. nov., male holotype 2 a lateral view of head 3 D. hirtiglobosa sp. nov., male holotype 3 a lateral view of head 4 D. securiformis sp. nov., male holotype 4 a lateral view of head. Scale bars: 1.0 mm.

Figures 7, 8. Male genitalia of Dryadaula species 7 D. auriformis sp. nov., holotype, slide No. DNAYLL 18124 8 D. flavostriata sp. nov., holotype, slide No. YLL 11112. Scale bars: 0.25 mm. (U = uncus lobes; T = tegumen; V = vinculum; S = saccus; S VIII = sternum VIII; Vr = right valva; Vl = left valva; J = juxta; A = aedeagus).