Stathmopoda bucera Wang & Wang & Guan 2021, sp. nov.

Stathmopoda bucera sp. nov.

(Figs 4, 17, 30)

urn:lsid:zoobank.org:act: 43BC07B0-9339-4DCC-A4F5-261022B6B705

Type material. CHINA, Yunnan: Holotype ♂, Laiyanghe, Pu’er, 1700 m, 28.VII.2007, leg. P You, slide No. GW 12267. Paratypes. 1♀, same data as holotype, slide No. GW 12288; 3♂, Taiyanghe, Pu’er, 1600 m, 11.VII.2013, leg. ZG Zhang, slide No. GW 13112; 2♂ 1♀, Taiyanghe, Pu’er, 1450 m, 8–23.VIII.2014, leg. ZG Zhang; 2♀, Taiyanghe, Pu’er, 1450 m, 5.VII.2015, leg. KJ Teng, slide No. GW 15141; 1♂, Baihualing, Mt. Gaoligong, Baoshan, 1473 m, 30.VII.2013, leg. SR Liu et al.

Diagnosis. The new species is similar to S. orbiculata Meyrick, 1913 and S. rhombica sp. nov. in the forewing having three white spots on the ventral margin. It can be distinguished from S. orbiculata by the elongate triangular uncus, the gnathos without a tooth apically, and the aedeagus without a cornutus in the male genitalia; the ductus bursae without a sclerotized sub-rectangular plate anteriorly and the corpus bursae with one signum in the female genitalia. In S. orbiculata, the uncus is trapezoidal, the gnathos has tooth apically, and the aedeagus has a cornutus; the ductus bursae has a sclerotized sub-rectangular plate anteriorly and the corpus bursae has two signa. It can be distinguished from S. rhombica by the horn-shaped cucullus gradually narrowed to apex, and the costa trapezoidally convex in the male genitalia; the quadrate antrum and the corpus bursae with a crescent signum in the female genitalia. In S. rhombica, the cucullus is subparallel to preapex, and the costa is roundly convex; the antrum is subrectangular and the corpus bursae has a C-shaped signum.

Description. Adult (Fig. 4). Wingspan 11.5–13.5 mm. Head with frons and vertex yellowish brown, occiput ochreous. Collar ochreous yellow, tinged with white scales. Labial palpus with second segment cream white on inner surface, pale yellow on outer surface, third segment pale ochreous on inner surface, ochreous yellow on outer surface. Antenna ochreous yellow, scape tinged with brown scales on posterior margin. Thorax and tegula white, basal 1/5 blackish brown, distal 1/3 ochreous yellow mixed with dark brown. Forewing dark brown in basal 2/3, ochreous yellow in distal 1/3, with a longitudinal ochreous yellow streak from basal 1/8 extending along anterior margin of cell to distal 1/3; ventral margin with three cream white spots edged with ochreous yellow scales: first spot smallest, between fold and ventral margin basally, anteriorly with a short ochreous yellow stripe along fold; second spot largest, sub-quadrate, from between basal 1/8 and 3/10 crossing fold, with ochreous yellow scales laterally and anteriorly; third spot elliptical, from between basal 2/5 and middle reaching posterior margin of cell, slightly narrowed to middle of fold on inner side, edged with ochreous yellow scales; distal 1/5 with a longitudinal dark brown streak along midline; fringe dark brown. Hindwing and fringe greyish brown. Legs ochreous yellow on dorsal surface, greyish white on ventral surface; fore femur and tibia blackish brown on outer side, tarsus tinged with brown scales at apices of basal two tarsomeres, black at apex; mid tibia with pale ochreous yellow bristles at middle and apex, tarsus black at apex; hind tibia black and bearing long ochreous brown bristles at apex, tarsus black at apex of each tarsomere, with ochreous brown bristles at apices of basal three tarsomeres. Abdomen brown on dorsal surface, yellowish brown on ventral surface.

Male genitalia (Fig. 17). Uncus elongate triangular, wide basally, narrowed to straight apex, with long setae laterally. Gnathos elongate triangular, reflexed in a hook apically. Tegumen broad, height approximately 1.5 times length of uncus. Valva nearly uniformly wide before cucullus; cucullus large horn-shaped, extending obliquely upward, length approximately twice of maximum width, obtuse on ventral margin, rounded at apex; inner process curved inward at basal 3/4 by a right angle; costa widened trapezoidally; sacculus concave at basal 1/3 on ventral margin, apex obtusely rounded, free from cucullus, exceeding ventral corner of cucullus. Vinculum narrowly banded; saccus semi-rounded, approximately 1/4 length of uncus. Juxta sub-quadrate, obtusely rounded anteriorly, straight on posterior margin; anellar lobes elliptical, approximately same length as juxta, with long setae. Aedeagus approximately 1.2 times length of valva, slightly tapered from base to apex, with a C-shaped plate at base; distal process clubbed, 2/5 length of aedeagus, rounded apically; cornutus absent.

Female genitalia (Fig. 30). Intersegmental membrane between papillae anales and eighth abdominal segment approximately 1.6 times length of papillae anales.Apophyses posteriores approximately 1.5 times length of apophyses anteriores. Eighth segment straight on posterior margin, with long setae; eighth tergite concave anteromedially; eighth stenite produced anteriorly. Antrum quadrate, with a weakly sclerotized longitudinal plate at middle. Ductus bursae approximately 1.2 times length of corpus bursae, gradually widened from base to corpus bursae, with denticles in anterior 1/4. Corpus bursae sub-rounded; signum placed at middle, approximately half width of corpus bursae, crescent, serrate on posterior margin, with dense microspines in surrounding area. Ductus seminalis originating from anterior 1/4 of ductus bursae, elongate tubular, with denticles basally, granulous distally.

Distribution. China (Yunnan).

Etymology. This specific epithet is derived from the Latin bucerus, referring to the horn-shaped cucullus.

Notes. Stathmopoda bucera sp. nov. is similar to Stathmopoda sp. 4 in Terada (2016) in the forewing pattern. It can be distinguished by the corpus bursae without spicules and the ductus seminalis originating from anterior 1/4 of the ductus bursae. In Stathmopoda sp. 4, the corpus bursae has spicules at about 2/7 of the corpus bursae and the ductus seminalis originates from below the entrance of the corpus bursae (Terada 2016, P. 92, 200, Figs 122, VI–4).