Xyrosaris triacantha Bae & Na, 2024

Na, Sol-Moon & Bae, Yang-Seop, 2024, Review of the genus Xyrosaris Meyrick (Lepidoptera, Yponomeutidae, Yponomeutinae) from Korea, with two new species, Zootaxa 5397 (3), pp. 418-426 : 425

Xyrosaris triacantha Bae & Na sp. nov.

urn:lsid:zoobank.org:pub:9D6E5BA0-0755-4F7B-9AFD-427DF2527DDC

( Figs 2H, 2I , 3D, 3H , 4D , 5D )

Type material. Holotype: [ INUB] ♂, Jeollanamdo Province , Hwasun-gun, Mt. Baeka-san Natural Recreation Forest (35°09'4.99"N, 127°10'1.36"E), 26.VIII.2015 (BS Park, SM Na & DJ Lee), genitalia slide no. INU-4743 . Paratypes: [ INUB] ♂, Chungcheongnamdo Province , Nonsan-si , Yangchon-myeon , Namsan-ri (36°09'21.52"N, 127°14'16.79"E), 1.VIII.2017 (SM Na & JH Ko), genitalia slide no. QNA-15. 1♀, Gyeongsangbukdo Province, Ulju-gun, Unyang-eup, Daegok-ri (35°36’44.60’’N, 129°11’31.79’’E), 7.VI.2017 (BS Park, SM Na & DJ Lee), genitalia slide no. QNA-16 .

Diagnosis. This species is extremely similar to X. insularis Ponomarenko & Beljaev superficially. But it only can be distinguished by the following genital characters: the valval harpe has three large thorns at apex in the male genitalia; the ductus bursae is over 2.5 times as long as corpus bursae in the female genitalia.

Description. Adult ( Figs 2H, 2I ). Wingspan 12 mm. Vertex rough and erected gray scales, speckled with dark gray shortly before tip, frons ocherous gray appressed scales. Antenna filiform; scape dark brown, speckled gray scales; flagellum light gray and dark brown rings. Labial palpus little upcurved, tuft on 2 nd and 3 rd segments, long erected gray scales, speckled with dark gray shortly before tip. Foreleg dark gray, irrorated with ocherous; midleg femur dark gray, irrorated with ocherous, tibia dark gray, irrorated with ocherous, yellow brown scales rounded anterior end, each segment of tarsus ocherous and sprinkled with dark gray posteriorly; hindleg femur ocherous, irrorated with dark brown at middle, posterior and anterior end with dark gray, tibia ocherous, tarsus pale ocherous, ringed with black gray at terminal. Thorax ocherous gray, irrorated with dark gray, dark gray scales at anterior end; tegula dark gray, mixed with ocherous. Forewing base color dark gray, suffused with ocherous scales, fringe ocherous gray, white spot before apex. Hindwing and fringe ocherous gray. Abdomen ocherous gray dorsally, scattered with dark brown scales ventrally.

Male genitalia ( Figs 3D, 3H ): Uncus triangular, blunted at apex. Socius little curved outwardly, with one thorn at apex. Valva elongated rectangular, valval harpe originated from base, curved near base, reach to middle of ventral margin of valva approximately, little curved up at apex with three big thorns. Saccus clavate. Aedeagus 1.4 times as long as valva, with cornuti composed of four rows of spinules from near the end to 1/3 posteriorly.

Female genitalia ( Figs 4D , 5D ). Papilla analis semioval with hairs. Intersegmental membrane between papilla analis and 8 th segment as long as 8 th segment. Apophysis anterioris branched and as long as apophysis posterioris. Sterigma well sclerotized, densely covered by long setae, one time convex at middle, protect ostium. Ductus bursae about 3 times as long as corpus bursae, membranous. Signum with enfolded transverse ridge at middle of corpus bursae.

Distribution. Korea.

Host plant. Unknown.

Etymology. This specific epithet is derived from the Greek prefix tria -, meaning three, and a specific name - acantha meaning “spike”, referring to the three thorns at valval harpe on the male genitalia.

Figures

FIGURE 2. Adults of Xyrosaris spp.: A. X. lichneuta Meyrick, female, Gyeonggido Province, Korea; B. ditto, female, Gangwondo Province, Korea; C. ditto, male, Gangwondo Province, Korea; D. X. insularis Ponomarenko & Beljaev, female, Gyeonggido Province, Korea.; E. ditto. female, Gyeongsangnamdo Province, Korea; F. X. vaginata sp. n., male, Gangwondo Province, Korea (holotype); G. ditto, male, Gangwondo Province, Korea (paratype); H. X. triacantha sp. n., male, Jeollanamdo Province, Korea (holotype); I. ditto, male, Chungcheongnamdo Province, Korea.

FIGURE 3. Male genitalia and enlarged valval harpe in Xyrosaris spp (A–H).: A, E. X. lichneuta Meyrick, genitalia slide no. INU-4739; B, F. X. insularis Ponomarenko & Beljaev, genitalia slide no. QNA-12; C, G. X. vaginata sp. n., genitalia slide no. INU-4742 (paratype).; D, H. X. triacantha sp. n., genitalia slide no. INU-4743.

FIGURES 4. Female genitalia of Xyrosaris spp.: A. X. lichneuta Meyrick, genitalia slide no. QNA-15; B. X. insularis Ponomarenko & Beljaev, genitalia slide no. QNA-08; C. X. vaginata sp. n., genitalia slide no. INU-4640; D. X. triacantha sp. n., genitalia slide no. QNA-06 (scale bar=0.5mm).

FIGURES 5. Enlarged stergima (A–D) in female genitalia of Xyrosaris spp.: A. X. lichneuta Meyrick; B. X. insularis Ponomarenko & Beljaev; C. X. vaginata sp. n.; D. X. triacantha sp. n..