Palumbina magnisigna Lee et Li

Ga-Eun Lee 1, Houhun Li, Taeman Han & Haechul Park, 2018, A taxonomic review of the genus Palumbina Rondani, 1876 (Lepidoptera, Gelechiidae, Thiotrichinae) from China, with descriptions of twelve new species, Zootaxa 4414 (1), pp. 1-73 : 13-14

Palumbina magnisigna Lee et Li , sp. nov.

( Figs 1 , 35 , 67 , 90 , 110 )

Type material. Holotype ♂, CHINA, Yunnan Province, Mt. Weibao (24.52°N, 98.84°E), 2244 m, Weishan County, 23.vii.2013, leg. Shurong Liu, Yuqi Wang and Kaijian Teng, genitalia slide no. LGE16035, DNA voucher no. LGE-G058 . Paratypes. Yunnan Province: 2 ♀♀, same data as holotype but 22̄ 23.vii. 201 3, genitalia slide no. LGE16036, DNA voucher nos. LGE-G059, LGE-G060 ; 1 ♂, Mt. Weibao (24.52°N, 98.84°E), 2200 m, Weishan County, 20.vii.2001, leg. Houhun Li and Xinpu Wang, genitalia slide no. ZJL05408 ; 1 ♂, Hudiequan (25.91°N, 100.1°E), 2030 m, Dali , 2.viii.2005, leg. Yingdang Ren ; 1 ♀, Bubang (21.60°N, 101.59°E), 656 m, Xishuangbanna , 24.vii.2014, leg. Kaijian Teng, Wei Guan, Xiuchun Wang and Shurong Liu ; 3 ♀♀, Mt. Weibao (25.18°N, 100.34°E), 2205 m, Dali , 31.vii ̄ 3.viii. 201 4, leg. Kaijian Teng, Wei Guan, Xiuchun Wang and Shurong Liu, DNA voucher no. LGE-G045 ; 2 ♂♂, Baihualing (25.30°N, 98.80°E), 1473 m, Baoshan , 5̄ 6.viii. 201 4, leg. Kaijian Teng, Shurong Liu and Hua Rong, genitalia slide nos. LGE16379, LGE17021, DNA voucher no. LGE- G046 ; Guangxi Zhuang Autonomous Region: 1 ♂, Fangchenggang City (21.68°N, 107.58°E), 370 m, 9.iv.2002, leg. Shulian Hao and Junhuai Xue, genitalia slide no. JZL05406 ; 1 ♂, 1 ♀, Mt. Daming (23.08°N, 107.14°E), 1250 m, 21.v.2011, leg. Linlin Yang and Yinghui Mou ; 1 ♀, Mt. Daqing (22.31°N, 106.71°E), 272 m, Pingxiang , 19.vii.2011, leg. Bingbing Hu et.al. ; 1 ♀, Shaoping Forest (22.06°N, 106.98°E), 190 m, Pingxiang , 24.vii.2011, leg. Bingbing Hu et.al., DNA voucher no. LGE-G051 ; 1 ♀, Shaoping Forest (22.06°N, 106.98°E), 280 m, Pingxiang , 28.iii.2012, leg. Xiaofei Yang, genitalia slide no. LGE16037 ; 1 ♀, Shaoping Forest (22.06°N, 106.98°E), 280 m, Pingxiang , 30.v.2012, leg. Xiaofei Yang, DNA voucher no. LGE-G053 ; 1 ♀, Shuolong Town (22.83°N, 106.83°E), Daxin, Chongzuo, 295 m, 6.vii.2013, leg. Xiaofei Yang ; Sichuan Province: 1 ♂, 1 ♀, Hailuogou (29.6°N, 102.1°E), 1695 m, Luding County, 30.vi ̄ 1.vii.2016, leg. Kaijian Teng and Xiaofei Yang, genitalia slide nos. LGE16266, LGE16378, DNA voucher no. LGE-G424.

Description. Adult (Fig. 67). Wingspan 9.0̄1 4.0 mm. Head silvery white to creamy white. Labial palpus white, strongly recurved and longer in female; segment I with outer surface slightly fuscous, segment II as long as III; in male, hair pencil reaching basal 1/3 of segment III, segment III with distal 1/2 fuscous; female with segments II and III often suffused with fuscous on dorsal surface. Antenna with scape white, fuscous distally on posterior margin; flagellum black except dorsal 1/3 white to creamy, cilia as long as width. Thorax and tegula anteriorly fuscous and posteriorly grey, sometimes entirely fuscous. Forewing ground color grey to dark fuscous, with ochreous reflections, dirty-white along fold, suffused with dirty-white scales before apex, sometimes indistinct; markings dirty-white or creamy: antemedian fascia straight, slender; distal streak at anterior 1/3 and 2/3, respectively, lying from distal 1/2 to distal 1/ 3 in parallel: upper distal streak usually slender, slightly upcurved toward costa, lower distal streak shorter, usually curved downward. Hindwing grey to fuscous, with ochreous reflections. Legs silvery-white to ochreous; fore femur, tibia and tarsus black on outer surface; mid tarsus with each segment apically black on outer surface, mostly black on inner surface; hind femur black at base, hind tibia black near tibial spurs, at middle and at apex on outer surface, mostly black on inner surface, hind tarsus with first tarsomere black at middle, remaining tarsomeres ringed with black apically.

Pregenital abdomen (Fig. 35). In male, coremata placed interiorly, about 1/3 length of abdomen; sternum VIII with lateral margin rounded, posteriorly emarginate at middle; tergum VIII posteriorly with a linear sclerite at middle.

Male genitalia (Fig. 90). Uncus short, rounded apically, tongue-shaped. Culcitula absent. Gnathos hook short, curved upward from middle. Tegumen broad, anterior margin broadly concave. Valva as long as tegumen, gradually narrowed from base to basal 4/5, slightly extending outward; distal 1/5 sharply narrowed, slightly incurved, weakly serrate on costa, pointed at apex. Sacculus approximately 1/3 length of valva, curved outward, gradually narrowing toward apex. Anellus lobe club-shaped, about 3/5 length of valva, rounded at apex. Vinculum sub-trapezoidal, nearly straight on posterior margin. Saccus slender, as long as anellus lobe, medially constricted, moderately pointed at apex, slightly exceeding tegumen pedunculi. Juxta simple, V-shaped, with sparse setae at basal 1/3 of inner margin. Aedeagus dilated basally, narrowing toward blunt apex; slender interior sclerite arising from middle, sinuous, exceeding apex.

Female genitalia ( Fig. 110 ). Papillae anales simple. Apophyses anteriores about 1/2 length of apophyses posteriores. Tergum VIII with posterior margin markedly narrowed at middle and forming a dome-shape; sternum VIII with posterior margin dented bilaterally, with deep incision at middle reaching near anterior margin. Ostium bursae large, sub-triangular. Ductus bursae slightly longer than corpus bursae; colliculum broad, between posterior 1/5 and 2/5; ductus seminalis arising from middle. Corpus bursae sub-elliptical; signum large, placed at middle, basal plate rhombiform, with a thick thumb-shaped process arising anteriorly.

Diagnosis. Palumbina magnisigna sp. nov. is superficially similar to P. oxyprora , but it can be distinguished by the lower distal streak of the forewing not reaching dorsum, while that of P. oxyprora does. The wing markings are also similar to those of European species P. guerinii , but the latter species is yellowish grey and is suffused with dirty-white or creamy scales at base (based on one male and three female specimens loaned from ZMUC which were collected from Greece). The labial palpus of P. magnisigna sp. nov. has the hair pencil reaching basal 1/3 of segment III, while that of oxyprora is longer and nearly reaches the apex; the segment III of the latter species is somewhat wider in dorsal view and slightly appressed. Palumbina magnisigna sp. nov. has the sternum VIII very similar to that of P. oxyprora , but the coremata are about twice longer in length. Male genitalia are differentiated from those of P. guerinii and P. oxyprora by having a broader valva, a sacculus and a saccus. The anellus lobe is almost uniformly long in P. magnisigna sp. nov., but that of P. oxyprora are constricted at base and rather dilated distal half bears a long apical bristle. Compared to the two species, P. guerinii has a shorter and basally broader anellus lobe not exceeding sacculus ( Fig. 88 ), while those of other species are longer and exceed the sacculus. The female genitalia are characterized by the dome-shaped tergum VIII, and the elliptical corpus bursae with a large signum.

Distribution. China (Guangxi, Sichuan, Yunnan).

Etymology. The species name is derived from the Latin magnus (large) and signum (signum), referring to the large size of the signum.

Variations. The color of the female labial palpi is darker than those of male. In female, the labial palpi are often suffused with ochre scales on outer and ventral sides and the dorsal fuscous coloration sometimes runs from distal half of segment II to the apex of segment III. Specimens from Yunnan are larger (wingspan 10.0̄1 4.0 mm, n=9) than those from Guangxi (wingspan 9.0̄1 1.0 mm, n=5) and have darker coloration with longer distal streaks on the forewing.

Figures

FIGURES 1, 2. Distribution of Chinese Palumbina spp. 1, the guerinii-group: ●, P.oxyprora (Meyrick), ■, P. magnisigna sp. nov., the grandiunca-group:▲,P.grandiunca sp.nov., ♣,P.melanotrichasp. nov.;2, unplaced spp.: ●,P.operaria(Meyrick), ■, P.sineloba sp. nov., ▲, P.acerosa sp. nov., ♣, P.rugosa sp. nov., ♥, P.pylartis (Meyrick).

FIGURES 34-39. Male sternum VIII of Palumbina spp. 34, P.guerinii (Stainton), slide no. ZMUC-NK01; 35, P. magnisigna sp. nov., slide no. LGE16266; 36, P. melanotricha sp. nov., slide no. LGE16060; 37, P.atricha sp. nov., slide no. LGE16298; 38, P.sigmoides sp. nov., slide no. LGE16301; 39, P.nesoclera (Meyrick), slide no. LGE16292. (Scale bars = 0.5 mm).

FIGURES 65-72. Adults of Palumbina spp. 65, P. guerinii (Stainton), ♀, collected from Greece; 66, P. oxyprora (Meyrick), ♀; 67, P.magnisigna sp. nov., ♂, holotype; 68, P.grandiunca sp. nov., ♂, holotype; 69, P.melanotricha sp. nov., ♂, holotype; 70, P.macrodelta (Meyrick), collected from Hainan, ♀; 71, P.macrodelta (Meyrick), collected from Yunnan, ♀; 72, P. atricha sp. nov., ♂, holotype.(Scale bars = 2.0 mm).

FIGURES 88-93. Male genitalia of Palumbina spp. 88, P. guerinii (Stainton), slide no. ZMUC-NK01; 89, P. oxyprora (Meyrick),slide no.LGE16196; 90, P.magnisigna sp. nov., slide no.LGE16379, paratype; 91, P.grandiuncasp.nov., slideno. LGE16043, holotype, a. lateral view of aedeagus, slide no. LGE16317, paratype; 92, P. melanotricha sp. nov., slide no. LGE16060, holotype; 93, P. macrodelta(Meyrick), slide no.LGE16088,collected from Hainan.(Scale bars = 0.2 mm).

FIGURES 110-113. Female genitalia of Palumbina spp. 110, P. magnisigna sp. nov., slide no. LGE16378, paratype; 111, P. grandiunca sp. nov., slide no. LGE16044, paratype; 112, P. macrodelta (Meyrick), slide no. LGE16042, collected from Hainan; 113, P.macrodelta (Meyrick), slide no. LGE16188, collected from Yunnan.(Scale bars = 0.4 mm).