Stathmopoda tetracantha, Wang & Wang & Guan, 2021

Stathmopoda tetracantha sp. nov.

( Figs 10 View FIGURES 10‒14 , 23 View FIGURES 21‒27 , 36 View FIGURES 33‒36 )

urn:lsid:zoobank.org:act:36809B81-30C5-403B-AB37-8F7BA4FA842B

Type material. CHINA, Hong Kong: Holotype ♂, Kadoorie Farm , 210 m, 21.IV.2007, leg. HH Li, slide No. GW 13173 . Paratypes. 1♂ 3♀, same data as holotype, 9–21.IV.2007, leg. HH Li, slide Nos. GW 13171 ♀ , GW13172 ♀.

Diagnosis. The new species is diagnostic by the greyish brown thorax with an ochreous spot anterolaterally; in the male genitalia by the sacculus with a large preapical spine that extends inward and the cornutus of the aedeagus with four long spines; and in the female genitalia by the ductus bursae expanded in kidney-shape posterolaterally. It is similar to S. octacantha sp. nov., and the differences between them are stated in the diagnosis of the latter species.

Description. Adult ( Fig. 10 View FIGURES 10‒14 ). Wingspan 7.5–9.0 mm. Head with frons silvery white; vertex dark silvery grey, shining; occiput yellowish brown. Labial palpus greyish white on inner surface, pale brown on outer surface, third segment darker on outer surface. Antenna greyish brown, scape tinged with yellowish brown on posterior margin. Thorax greyish brown, with an ochreous spot anterolaterally; tegula greyish brown. Forewing greyish brown in basal half, yellowish brown from middle to basal 3/4, blackish brown in distal 1/4; yellowish brown along basal 1/5 of costal margin and above fold basally; cell with a faint dark brown streak from middle to its outer margin along midline; fringe brown, dark brown around apex. Hindwing greyish brown; fringe pale brown. Foreleg purplish black; midleg grey, tibia and tarsus blackish grey on outer side, tibia with yellowish brown bristles at middle and apex; hindleg greyish black, tibia with long purplish brown bristles at apex, tarsus with long purplish brown bristles at apices of basal two tarsomeres. Abdomen shining silvery grey on dorsal surface, yellowish white on ventral surface.

Male genitalia ( Fig. 23 View FIGURES 21‒27 ). Uncus wide at base, narrowed to basal 4/5, parallel from distal 1/5 to obtusely rounded apex, with long setae laterally. Gnathos tongue-shaped, rounded at apex. Tegumen broad, height approximately 1.3 times length of uncus. Valva sub-rectangular, slightly narrowed at basal 1/3; cucullus sub-rounded, with long setae; costa elongate elliptical; sacculus approximately 4/5 length of valva, narrow in basal half, wide in distal half, reaching before apex of valva apically, concave at middle on ventral margin, with a large preapical spine that extends inward crossing half width of cucullus. Vinculum narrowly banded; saccus V-shaped, approximately 1/3 length of uncus. Juxta turbinate, narrowly rounded anteromedially, straight on posterior margin; anellar lobes banded, straight, heavily sclerotized on inner margin. Aedeagus approximately 1.2 times length of valva, almost uniformly wide, slightly narrowed from distal 1/6 to apex, with a sclerite near base, sclerotized from basal 1/3 to 4/5 laterally; cornutus consisting of four long spines, half length of aedeagus.

Female genitalia ( Fig. 36 View FIGURES 33‒36 ). Intersegmental membrane between papillae anales and eighth abdominal segment approximately three times length of papillae anales. Apophyses posteriores approximately twice length of apophyses anteriores. Eighth segment straight on posterior margin, with long setae; eighth tergite pointed anteromedially; eighth stenite obtusely rounded on anterior margin. Antrum funnel-shaped, weakly sclerotized. Ductus bursae narrow tubular in posterior half, broadened in anterior half, expanded in kidney-shape posterolaterally. Corpus bursae elongate elliptical; signum consisting of small denticles, placed at middle of corpus bursae. Ductus seminalis from posterior part of corpus bursae, elongate tubular; bulla rounded, at basal 1/3.

Distribution. China ( Hong Kong).

Etymology. This specific epithet is derived from the Latin tetr - and acanthus, referring to the number of cornuti.