Thiotricha biformis (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/F3B4DBC7-9438-50BC-B0DD-53F105DA7CCF
treatment provided by	ZooKeys by Pensoft
scientific name	Thiotricha biformis (Omelko, 1984)
status

Treatment

Thiotricha biformis (Omelko, 1984) Figs 4A, B View Figure 4 , 7A View Figure 7 , 8A, B View Figure 8 , 9A View Figure 9 , 10A View Figure 10

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

Thiotricha biformis : Sohn et al. 2015: 116

Material examined.

Japan - Hokkaido [Hokkaido] • 1♂,1♀; Katsuranosawa, Uryu-cho, Uryu-gun; 20 Jul. 2018; S. Yagi leg. • 1 ♂; Katsuranosawa, Ishikari city; 15 Jul. 2007; H. Kogi leg. • 1♂; Manzi, Kurisawa; 8 Jul. 2001; H. Kogi leg.; gen. slide no. KM-143 • 1 ♂, 1♀; same locality and collector; 28 Jul. 2003; gen. slide no. KM-144(♂) • 1♂; Kotan Atuta; 10 Jul. 2003; H. Kogi leg. • 1♀; Nopporo (Atsubetsu); 27 Jul. 1993; T. Hirowatari leg. • 2♀♀; Kamisibun, Iwamizawa; 9 Jul 2011; 8 Aug. 2012; H. Kogi leg.; gen. slide no. KM-145 • 1♀; Hukui, Niseko; 4 Aug. 2006; H. Kogi leg. • 1♀; Tiyosibetu, Hamamasu; 14 Jul. 2000; H. Kogi leg. • 1♀; Asari Pass, Otaru; 28 Jul. 2012; H. Kogi leg.; gen. slide no. KM-146. - Honshu [Iwate] • 1♀; Atei-Sanso Niisato vill.; 6 Jul. 2002; T. Oku leg. (TO).

Diagnosis.

The forewing is white with broad, dark brown fascia, a rather large yellow patch before the apex, and a black rounded apical spot demarcated by a white line. The anellus lobe of the male genitalia is a short and heavily sclerotized beak-shaped lobe basally, armed with a small claw-like process apically, which is a unique characteristic of this species. The apopyhsis posterioris of the female genitalia is ca. 1/2 the length of the papilla analis and approx. two times longer than the apophysis anterioris; the signum is absent in the corpus bursae.

Description.

Male. ( Figs 4A View Figure 4 , 7A View Figure 7 ). Forewing length 3.2-3.7 mm. Wing expanse 7.0-8.1 mm.

Head: covered with shiny, creamy white appressed scales. Antennae filiform; basal segment (scape) elongate without pecten, creamy white; flagellum creamy white on dorsal surface before middle, then entirely grayish brown beyond on its dorsal and ventral surface, with rather long and fine cilia ventrally. Labial palpus white, long, and recurved; first segment shortest with creamy white scales; second segment thickened, ca. 2.5 the thickness times of first, covered entirely with white scales; third segment white on dorsal surface, sparse brown scales medially on ventral surface, as long as second segment, apex sharply acute.

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

Legs: white; forefemur, tibia, and tarsus suffused inwardly with brownish tinge, white on outer surface; mid legs entirely white; hind femur and tibia white, with a row of long, stiff, stout white bristles on upper and lower surfaces; all tarsal segments brownish gray.

Forewing: eleven veins, R3 + R4 stalked, M1 separate, R5 absent, anal veins furcate ( Fig. 7A View Figure 7 ). Forewing broader in this genus, ground color white to middle, followed by a dark brown fascia, rather large yellow patch before apex not protruding to costal margin; small brown area in costal margin, intercepted by oblique white lines with a rounded black apical spot; small scattering of yellow scales below apical point at outer margin, small brown scale in tornal area; cilia blackish brown at inner margin of apex, outer margin with brown through inner base of wing.

Hindwing: darker grayish brown with tiny black apical dot at apex; cilia well-fringed, grayish brown, with dark brown at tip of wing.

Male genitalia: ( Figs 8A, B View Figure 8 , 9A View Figure 9 ) eighth abdominal sternite rather semicircular, broadly concave with strongly sclerotized margin. Uncus semicircular with a few hairs on top. Gnathos sickle-shaped, short and stout, wide and flattened posteriorly, and then curved at middle toward apex. Tegumen long, slightly concave medially, bearing dense hairs on dorsal surface at approx. the midpoint. Anellus lobe, a short and heavily sclerotized beak-shaped lobe, approx. half the length of valva, slightly narrow at base, and then abruptly dilate with short and small claw-like process apically, with a few sclerotized spines at approx. the midpoint on inner dorsal surface. Valva elongate, slender, and curved inwardly, somewhat broad basally, narrowly elongate from base to 2/3 of its length, then distended again at apex, bearing thin and fine setae on its inner surface. Vinculum moderately broad, median process rising to a pair of transverse ridges of short, thorn-like spines on edge of posterior surface, rather long and short fine setae emerging around and below the ridge surface. Saccus broad basally, somewhat triangularly produced. Phallus short and sclerotized, clavate basally and straightly elongate with a round tip distally.

Female. ( Figs 1 View Figure 1 , 4B View Figure 4 ). Forewing length 2.5-3.9 mm. Wing expanse 5.5-8.2 mm. Similar to male.

Female genitalia: ( Fig. 10A View Figure 10 ) papilla analis long and bilobed with short and long fine setae on its entire surface. Apophyses short; apophysis anterioris shorter, nearly 1/2 length of apophysis posterioris. Ostium opening near anterior margin of 8th sternite. Ductus bursae partially sclerotized, narrow, and slightly elongate, as long as corpus bursae. Corpus bursae large and rounded; signum absent.

Distribution.

Japan (Hokkaido, Honshu), Russia, Korea.

Host plant.

Unknown.

Remarks.

Sohn et al. (2015) treated this species as Thiotricha biformis , without explaining the taxonomic reasons.