Stathmopoda trigonia S. Wang & Guan, 2021

Wang, Shuxia, Guan, Wei & Wang, Ailing, 2021, Genus Stathmopoda Herrich-Schäffer, 1853 (Lepidoptera: Stathmopodidae) from China (III): Descriptions of fourteen new species, Zootaxa 5039 (1), pp. 71-108 : 77-78

Stathmopoda trigonia S. Wang & Guan , sp. nov.

( Figs 5 , 30 , 53 )

Type material. CHINA, Hainan: Holotype ♂ , Hongxin Village (19.07°N, 109.52°E), Yuanmen Town , Baisha County, 460 m, 29.VI.2014, leg. PX Cong et al., slide No. GW 15021 . Paratypes. 4♂ 5♀, 29.VI–1.V.2014, other same data as holotype, slide Nos. GW 15023 ♂, GW15022 ♀; Yunnan : 1♀, Menglian, Pu’er , 950 m, 30.X.2010, leg. BB Hu & J Zhang, slide No. GW 15013 .

Diagnosis. The new species is similar to S. brachymochla Meyrick, 1937 in appearance and in male genitalia. It can be distinguished in the male genitalia by the triangularly arranged androconia running from base to middle, the aedeagus lacking a sclerite basally and with a straight slender distal process; in the female genitalia by the antrum without tufts of scales medially and the appendix bursae having 13‒14 denticles basally. In S. brachymochla , the androconia is arranged sub-rectangularly along basal 3/5 above ventral margin, the aedeagus has a sclerite near base and the spine-shaped distal process is bent at distal 2/5 ( Fig. 29 ); the antrum has a tuft of black scales medio-longitudinally and the appendix bursae has 2‒3 denticles basally in the female genitalia. The new species is also similar to S. culcitella Sinev, 1995 , and the differences between them are stated in the diagnosis of the latter species.

Description. Adult ( Fig. 5 ). Wingspan 8.5‒10.5 mm. Head with frons pale greyish brown; vertex and occiput dark bronzy grey, with purplish metallic lustre. Labial palpus greyish brown on inner surface, dark brown on outer surface. Antenna blackish brown. Throax and tegula blackish grey. Forewing dark silvery grey, with two yellow fasciae not reaching costal margin: antemedian fascia beyond basal 1/3, edged with blackish brown scales laterally and anteriorly; postmedian fascia at basal 2/3, with a large sub-quadrate blackish brown patch on its inner margin not reaching dorsum, with scattered blackish brown scales on outer margin; distal 1/4 with a blackish brown spot along midline, weakening toward apex; fringe dark grey. Hindwing and fringe brown. Foreleg with tibia and tarsus blackish brown on outer surface, greyish white on inner surface; midleg with tibia greyish white, annulated with black at base, middle and apex respectively, with long dark brown bristles at middle and apex, tarsus blackish brown dorsally, greyish white ventrally; hindleg greyish white, tibia annulated with black, bearing long dark brown bristles at middle and apex, tarsus with long dark brown bristles at apices of basal two tarsomeres, second tarsomere blackish grey. Abdomen with dorsal surface blackish brown except white on posterior margin of each segment; ventral surface shinning white; blackish brown and shinning white laterally.

Male genitalia ( Fig. 30 ). Uncus long and slender, with long setae laterally, hooked apically. Gnathos wide at base, abruptly narrowed to apex distally, articulated with posterior 1/3 of tegumen basally, about half length of uncus. Tegumen narrow, slightly widened anteriorly, height 1.5 times length of uncus, produced to a sub-quadrate process anterolaterally. Valva with costa wide basally; inner process hooked; cucullus sub-rectangular, length twice of median width, rounded at apex, produced dorsoapically, androconia triangularly arranged, running from base to middle, half length of cucullus; sacculus wide, concave before middle on ventral margin, distal half folded, free from valva, rounded apically. Vinculum narrowly banded. Juxta straight on posterior margin, obtusely rounded on anterior margin; anellar lobes long clubbed. Aedeagus approximately 5/6 length of valva, sub-rhombic; distal process slender, straight, 1/4 length of aedeagus; cornuti consisting of a S-shaped needle, a tuft of short spines at basal 1/3 and a long spine approximately half length of aedeagus distally ( Fig. 30a ).

Female genitalia ( Fig. 53 ). Papillae anales longer than wide, fused conically, with short setae. Intersegmental membrane between papillae anales and eighth abdominal segment seven times length of papillae anales. Apophyses posteriores 2.5 times length of apophyses anteriores. Eighth segment straight on posterior margin, with long setae; eighth tergite sub-rectangular; eighth sternite produced anteromedially. Antrum inverted T-shaped, with tufts of scales arranged in a fan-shape on its inner wall laterally, scale tufts black anteriorly, ochreous brown posteriorly. Ductus bursae broad and short, wrinkled, approximately half length of corpus bursae. Corpus bursae ovate, with a round membraneous process arising from outer surface posteriorly; two signa situated at middle, larger one with a wide ridge furcate on one end, smaller one elongate elliptical, serrate on one side.Appendix bursae arising from anterior part of ductus bursae, rugose, with 13‒14 denticles basally; ductus seminalis elongate tubular, granulous distally.

Distribution. China (Hainan, Yunnan).

Etymology. The specific epithet is derived from the Latin trigonius, referring to the androconia in basal half of the cucullus arranged triangularly.

Figures

FIGURES 3‒12. Adults of Stathmopoda spp. 3, S. apicihamata sp. nov., holotype, ♂; 4, S. culcitella, ♂; 5, S. trigonia sp. nov., holotype, ♂; 6, S. xanthomochla, ♂; 7, S. aprica, ♂; 8, S. similignominiosa sp. nov., holotype, ♂; 9, S. sufusciumeraris sp. nov., paratype, ♂; 10, S. balanarcha, ♂; 11, S. ferrorufa sp. nov., paratype, ♀; 12, S. jinxiuensis sp. nov., holotype, ♂. Scales = 2.0 mm.

FIGURES 27‒32. Male genitalia of Stathmopoda spp. 27, S. apicihamata sp. nov., holotype, slide No. GW15015, 27a, enlarged gnathos; 28, S. culcitella, slide No. GW15019, 28a, enlarged gnathos; 29, S. brachymochla, slide No. GW13195, 29a, enlarged gnathos; 30, S. trigonia sp. nov., paratype, slide No. GW15023, 30a, enlarged cornutus; 31, S. xanthomochla, slide No. GW13194; 32, S. aprica, slide No. GW15008. Scales: 27, 29, 31‒32 = 0.2 mm, 28, 30 = 0.25 mm, 27a = 0.05 mm, 28a, 29a, 30a = 0.1 mm.

FIGURES 52‒56. Female genitalia of Stathmopoda spp. 52, S. culcitella, slide No. GW15020; 53, S. trigonia sp. nov., paratype, slide No. GW15022; 54, S. xanthomochla, slide No. GW12314; 55, S. aprica, slide No. GW12260; 56, S. similignominiosa sp. nov., paratype, slide No. GW15148. Scales = 0.5 mm.