Palumbina acerosa 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 : 27-28

Palumbina acerosa Lee et Li , sp. nov.

( Figs 2 , 12 , 16 , 62 , 65 , 81 , 102 , 120 )

Type material. Holotype ♂, CHINA, Guizhou Province, Guocun Village (29.16°N, 107.44°E), Daozhen County, 1300 m, 21.viii.2004, leg. Yunli Xiao, genitalia slide no. ZJL05 472 . Paratypes. Guizhou Province: 1 ♂, samedata as holotype, genitalia slide no. ZJL05043 ; 1 ♀, Dashahe (29.16°N, 107.61°E), 1350 m, Daozhen County, 2 5.v.2004, leg. Shulian Hao, genitalia slide no. ZJL05471 ; Jiangxi Province: 1 ♀, Mt. Sanqing (28.9°N, 118.07°E), 1120 m, Yushan County, 2 0. viii.1985, genitalia slide no. W98132 ; Hubei Province: 1 ♀, Houhe (30.08°N, 110.56°E), 1 10 0 m, Wufeng County, 1 1.vii.1999, leg. Houhun Li et al ; Hainan Province: 1 ♀, Jianfengling (18.73°N, 108.91°E), 940m, 2.vi.2007, leg. Zhiwei Zhang and Weichun Li, genitalia slide no. LGE16337 ; Taiwan: 1 ♂, Hueisun Exp. Forest (24.17°N, 120.96°E), Nantou, 2 2̄2 4.x.1998, leg. Mey and Ebert ( MNHU) .

Description. Adult (Figs 12, 16, 81). Wingspan 10.5̄12.0 mm. Head silvery white. Labial palpus silvery white; in male, segment II fuscous dorso-distally, hair pencil reaching distal end of segment II; segment III greyish white dorsally, 1/2 length of segment II, roughly scaled, with a needle-like structure arising from apex of segment II and situated in ventral furrow of segment III: this structure as long as segment III, rarely visible without removing scales (Fig. 12); in female, segment II with dorso-distal half fuscous, as long as segment III, segment III fuscous, pointed at apex. Antenna with scape white; flagellum with dorsal half white, remaining flagellum black; male with cilia slightly longer than width. Thorax silvery white, fuscous posteriorly. Tegula silvery white, suffused with fuscous on anterior and posterior margins. Forewing with hair pencil reaching basal 1/ 6 in male, sometimes indistinct; ground color silvery white, with brown or fuscous markings: basal fascia narrow; V-shaped basal marking at 1/5, usually confluent with basal fascia on costa, reaching fold posteriorly; antemedian fascia slender, zigzagged, confluent with V-shaped basal marking on fold, narrowly interrupted by white scales below fold; median fascia zigzagged, twice width of antemedian fascia; distal fascia broad, from between 2/3 and 5/6 of costal margin to dorsum, confluent with median fascia on costa, its inner margin shortly extended medially toward base; subapical spot present. Hindwing dark grey. Legs as in P. pylartis .

Pregenital abdomen. In male, coremata situated interiorly, about 1/3 length of abdomen; sternum VIII rounded laterally, nearly straight at middle on posterior margin; tergum VIII with sclerotized edge. Female with segment VII moderately concave on posterior margin.

Male genitalia (Figs 62, 102). Uncus elliptical, with sparse hairs at base, slightly emarginated at apex. Culcitula present. Gnathos hook slender and long, curving upward, pointed at apex. Tegumen three times longer than uncus; medial process sclerotized, thicker than gnathos hook, curved upward, serrate ventrally on distal half; behind process broadly set with large tubercles, each tubercle rounded, with a long hair at apex (Fig. 62). Valva nearly straight, slightly constricted at distal 1/3, with short hairs in distal 1/3, blunt at apex. Anellus lobe uniformly long and well sclerotized, curved inward, 3/5 length of valva, shortly forked at apex; subapical bristle short, about 1/6 length of anellus lobe. Vinculum simple, posterior margin broadly concave medially. Saccus elongate subtriangular, 1/2 length of anellus lobe, rounded at apex. Juxta with a pair of sub-triangular lateral processes bearing sparse hairs along inner margin, sharply pointed at apex. Aedeagus with basal 1/4 dilated, distal 3/4 slender and nearly straight, blunt at apex.

Female genitalia (Fig. 120). Papillae anales simple. Intersegmental membrane with a transverse linear sclerite near posterior margin of sternum VIII. Apophyses anteriores 1/4 length of apophyses posteriores. Tergum VIII divided into two sclerites, their inner margins close anteriorly and remote posteriorly; sternum VIII with posterior margin nearly straight, weakly sclerotized medially, anterior margin strongly projected in V-shape. Ostium bursae small, opening at anterior margin of sternum VIII. Ductus bursae narrow; ductus seminalis arising from posterior 1/ 3 or from middle. Corpus bursae oval, with microtrichia posteriorly; signum at posterior 1/3, rounded, with dense minute denticles.

Diagnosis. Palumbina acerosa sp. nov. can be distinguished from other congeners by the male labial palpus. The segment III is roughly scaled and much shorter (1/2 length of segment II) than its allies (usually as long as segment II). Especially, the apex of segment II bears a needle-like structure, which is unique in this genus. The hair pencil of forewing is very short and only reaches basal 1/6 of forewing, while that of related species reaches basal 2/3 or 3/5. The male genitalia are somewhat similar to those of P. triangularis sp. nov., but P. acerosa sp. nov. can be separated from the latter by the uniformly long anellus lobe, the smaller process of juxta and the elliptical uncus. The female genitalia are characterized by the linear sclerite on the intersegmental membrane and the V-shaped anterior margin of the sternum VIII.

Distribution. China (Guizhou, Hainan, Hubei, Taiwan).

Etymology. The species name is derived from the Latin acerosus (needle-like), referring to the needle-like structure arising distad on segment II of the labial palpus in male.

Remarks. This new species was not included in our molecular analysis.

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 6-14. Male labial palpus of Palumbina spp. 6, P.operaria (Meyrick); 7, P.macrodelta (Meyrick); 8, P. chelophora (Meyrick); 9, P. operaria (Meyrick), slide no. ZJL05451H; 10, P. sineloba sp. nov., slide no. LGE16033H; 11, P. oxyprora (Meyrick), slide no. LGE16196H; 12, P. acerosa sp. nov., slide no. ZJL05043H; 13, P. nesoclera (Meyrick), slide no. NKLGE007; 14, P. macrodelta(Meyrick), slide no. NKLGE004.(Scale bars = 2.0 mm).

FIGURES15-18.Male antenna of Palumbina spp.15, P.acuticula sp. nov.; 16, P.acerosa sp. nov., slide no. ZJL05043H; 17, P. sineloba sp. nov., slide no. LGE16033H; 18, P. atricha sp. nov., slide no. NKLGE006. (Scale bars = 0.1 mm). Arrows indicate unseparated flagellomeres I and II.

FIGURES 58-64. Male tegumen structures of Palumbina spp. 58, P. acinacea sp. nov., slide no. LGE16321, 58a, enlarged view of tubercles; 59, P. pylartis (Meyrick), slide no. LGE16315; 60, P. sineloba sp. nov., slide no. LGE16333; 61, P. spinevalva sp. nov., slide no. LGE16332; 62, P. acerosa sp. nov., slide no. ZJL05472; 63, P. triangularis sp. nov., slide no. LGE16263;64, P. chelophora (Meyrick), slide no.LGE16087. (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).

FIGURES81-87. Adults of Palumbina spp.81, P.acerosa sp.nov., ♂, holotype; 82, P.triangularis sp. nov., ♂,holotype; 83, P. operaria (Meyrick), ♀; 84, P. rugosa sp. nov., ♀, holotype; 85, P. acuticula sp. nov., ♂, holotype; 86, P. chelophora (Meyrick), ♂; 87, P.diplobathra (Meyrick), ♂. (Scale bars = 2.0 mm).

FIGURES 100-105. Male genitalia of Palumbina spp. 100, P. sineloba sp. nov., slide no. LGE16189, holotype; 101, P. spinevalva sp. nov., slide no. LGE16193, holotype;102, P.acerosa sp. nov., slide no. ZJL05472, holotype; 103, P.triangularis sp. nov., slide no. LGE16263, holotype; 104, P.operaria (Meyrick), slide no. LGE16039; 105, P. acuticula sp. nov., slide no. LGE17019, holotype.(Scale bars = 0.2 mm).

FIGURES 118-121. Female genitalia of Palumbina spp. 118, P. pylartis (Meyrick), slide no. LGE16191; 119, P. sineloba sp. nov., slide no. LGE16340, paratype, 119a, enlarged view of microtrichia; 120, P. acerosa sp. nov., slide no. LGE16337, paratype; 121, P. triangularis sp. nov., slide no. LGE16198, paratype. (Scale bars = 0.4 mm).