Thiotricha angustella (Omelko, 1984) Omelko, 1984

Kyaw, Khine Mon Mon, Yagi, Sadahisa, Oku, Jouhei, Sakamaki, Yositaka & Hirowatari, Toshiya, 2019, Taxonomic study of Thiotricha Meyrick (Lepidoptera, Gelechiidae) in Japan, with the description of two new species, ZooKeys 897, pp. 67-99 : 67

publication ID	https://dx.doi.org/10.3897/zookeys.897.38529
publication LSID	lsid:zoobank.org:pub:88D86D5E-12BC-4C97-A3BE-3A5F704A8753
persistent identifier	https://treatment.plazi.org/id/4383E1E7-B730-5F67-A5F5-93683DED7ACE
treatment provided by	ZooKeys by Pensoft
scientific name	Thiotricha angustella (Omelko, 1984)
status	comb. nov.

Treatment

Thiotricha angustella (Omelko, 1984) comb. nov. Figs 4C, D View Figure 4 , 7B View Figure 7 , 8C, D View Figure 8 , 9B View Figure 9 , 10B View Figure 10

Cnaphostola angustella Omelko, 1984: 32; Omelko 1999: 183; Oku 2003: 65; Park and Ponomarenko 2007: 45; Ueda 2013: 298.

Material examined.

Japan - Hokkaido [Hokkaido] • 1♀; Yamato, Erimo; 15 Jul. 2002; H. Kogi leg.; Host: Quercus dentata ; TO • 1♂; same locality and collector; 19 Jul. 2003; Host: Quercus dentata • 1♂; Syoya, Erimo; 30 Jun. 2002; H. Kogi leg. • 1♂; Tomikawa, Monbetu; 21 Jul. 2004; H. Kogi leg.; Host: Quercus dentata ; TO • 3♀♀; same locality and collector; 23-25 Jul. 2006; 6 vii 2007 • 2♀♀; Higasihayakita, Hayakita; 20 Jul. 2005; H. Kogi leg. • 1♂; Tiyosibetu, Hamamasu; 13 Jul. 2002; H. Kogi leg. • 1♂; Katsuranosawa, Atuta; 21 Jul. 2002; H. Kogi leg. • 1♂; Uenai, Tomakomai; 26 Jul. 2002; H. Kogi leg. - Honshu [Iwate] • 1♀; Iwayama, Morioka; 2 Jul. 2009; T. Oku leg.; Host: Quercus mongolica ; 13 Jul. 2009 em.; TO. - Honshu [Nagano] • 1♀; Kojiro, Tenryu-mura; N. Hirano leg.; 5 Jul. 2008; gen. slide no. KM-118 • 1♂; same locality and collector; 28 Aug. 2009; gen slide no. KM-106. - Honshu [Aichi] • 1♂; Asahikogen, Asahi-cho; 7 Jul. 2001; T. Mano leg.; OPU. - Honshu [Mie] • 1♂; Hijiki 250m, Ueno-city; 27 Jun. 1997; T. Mano leg.; gen. slide no. KM-1; OPU • 1♂; Hudodani, Miyama-tyo; 30 Jun. 2001; T. Mano leg.; gen. slide no. KM-96; OPU. - Honshu [Kyoto] • 1♂; Mt.Ponpon; 1 Jul. 2000; N. H. Ahn leg.; gen. slide no. KM-2; OPU. - Honshu [Nara] • 1♀; Wasamatayama; 9-10 Aug. 1989; S. Moriuti leg.; gen. slide no. KM-51; OPU.

Diagnosis.

The forewing is white with pale brown in the distal part, without an apical black spot. The anellus lobe of the male genitalia is a pear-shaped lobe basally, long, strongly sclerotized, and spine-like apically; the valva is narrow and elongate. The apophysis posterioris of the female genitalia is approx. two times of the length of papilla analis and approx. three times longer than the apophysis anterioris; the signum is long, narrow, and arch-shaped.

Description.

Male ( Figs 4C View Figure 4 , 7B View Figure 7 ). Forewing length 2.7-3.4 mm. Wing expanse 6.0-7.3 mm.

Head: shiny creamy white with appressed scales. Antennae filiform, basal segment elongate without pecten and creamy white; flagellum creamy white on dorsal surface before middle, then grayish brown beyond, with extraordinarily long and fine cilia on its ventral surface. Labial palpus white, long, and recurved; first segment shortest, creamy white suffused with brown scales on outer surface; second segment thickened, up to 2.5 times the length of the first and white; third segment nearly as long as second, creamy white evenly on both surfaces, apex sharply acute.

Thorax: creamy white. Tegula shiny, creamy white dorsally, ornamented with bronze-brown scales along anterior margin.

Legs: white; forefemur, tibia, and tarsus suffused inwardly with brown; hind tibia creamy white, with a row of long, stiff, stout white bristles at approx. the midpoint anteriorly, with dark brown bristles at ca. 1/4 posteriorly on dorsal surface, with white bristles ventrally.

Forewing: eleven veins, R4 + M1 stalked, R5 absent, anal vein furcate ( Fig. 7B View Figure 7 ). Forewing ground color shiny creamy white, somewhat rounded and pointed apically, with a brownish hue apically 1/5 of the way beyond costal margin; cilia well-fringed, brown from costal area before apex and brownish white along outer margin to inner base of wing.

Hindwing: narrower than forewing, white to whitish brown; cilia well-fringed, white to brownish white; apex produced conspicuously.

Male genitalia: ( Figs 8C, D View Figure 8 , 9B View Figure 9 ) eighth abdominal sternite triangular, long, slightly broadened at base, and then tapered toward posterior with a blunt tip. Uncus swollen, like a small tubercle, short and fine hairs on its top. Gnathos short and stout, its posterior margin closer to base with a hump-like outgrowth; closer to top, somewhat expanded, with a blunt tip. Tegumen much longer than uncus, with dense hairs at approx. the midpoint of its length on dorsal surface. Anellus lobe quite long and pear-shaped basally, bearing a rather long and strongly sclerotized spine-like process at apex, slightly acute and curved inward. Valva elongate, slender, slightly expanded basally, narrow to 3/4 of its length, moderately dilated, and lobate with fine, dense hairs on its inner surface apically, moderately curved inwardly, exceeded apex of tegumen. Vinculum narrow, bearing a few rather long spines on median process of vinculum. Saccus broad basally and U-shaped. Phallus long, small, and spherical at base, and extended distally.

Female ( Fig. 4D View Figure 4 ). Forewing length 3.2-3.4 mm. Wing expanse 7.1-7.5 mm. Similar to male.

Female genitalia: ( Fig. 10B View Figure 10 ) papillae anales nearly half the length of the apophysis posterioris, with two lobes and long and short fine setae on its entire surface. Apophysis posterioris as much as three times the length of apophysis anterioris. Ostium opening near posterior margin of 8th sternite. Ductus bursae narrow, nearly equal in length to corpus bursae and moderately sclerotized. Ductus seminalis arising from the posterior third of ductus bursae. Corpus bursae oblong; signum long and a narrow arch shaped at left side wall of posterior end.

Distribution.

Japan (Hokkaido, Honshu), Russia, Korea.

Host plant.

Quercus dentata ( Kogi 2008), Q. mongolica ( Fagaceae ) (new host record).

Biology.

Kogi (2008) reported that the larvae of T. angustella occur in August until the following June and make a portable case with fragments of a host plant leaf. The mature larvae use a larger piece of leaf like a hat. Dr. T. Oku collected a case from Q. mongolica in Iwate Prefecture in July.