Fibuloides geniculata Pinkaew and Zhang

Pinkaew, Nantasak & Zhang, Aihuan, 2012, Two new species of Fibuloides Kuznetsov, 1997 (Lepidoptera: Tortricidae) from Thailand, Zootaxa 3256, pp. 51-57 : 52-54

Fibuloides geniculata Pinkaew and Zhang , n. sp.

( Figs. 1 A–B, 2, 3A, 4A)

Diagnosis. This species can be easily distinguished from all other species by a forewing with a wide, much darker band along the costa and a strongly upwardly curved phallus.

Description. Head: Upper frons light brown mixed with dark brown, lower frons yellowish white; labial palpus with first segment light brown to brown with yellowish white dorsally, second segment dilated apically by scales, orange white with brown spots basally and dorsomedially, with patch of brown to dark brown at 2/3 length ventrally, apical segment light brown; vertex brown mixed with brownish gray; antenna light brown with dorsal notch at base of flagellum.

Thorax: Pronotal collar brown; tegula brown mixed with dark brown on basal 1/3; mesonotum brown mixed with grayish brown. Forewing ( Figs. 1 A–B) length 6.2 mm in male (n=1), 6.8 mm in female (n=1); male costal fold absent; dorsum half of wing with three tufts of raised scales medially; termen slightly concave below apex, with yellowish white spot between R5 and M1 on termen and dark brown narrow line along margin extending from R5 to CuA1; costal strigulae 2–9 paired, yellowish white and separated by dark brown spots, strigula 1 indistinct, with oblique silvery striae from strigulae 5–8 to R4 and a short silvery stria from strigula 9 to R5; fasciae present as dark brown spots on costa; ground color pale yellowish gray intermixed with light brown, with large patch extending from costa to M1, dark grayish brown, darker on apical half, wing apex dark brown. Underside light brown, strigulae on costa and termen yellowish white. Hindwing in male with modified, narrow anal area, light grayish brown with dense fringe of large, blackish brown scales along base of anal margin; unmodified in female.

Abdomen ( Fig. 2 ): Male tergum V–VIII with two kinds of modified scales: long and slender scales in a narrow anterior band and short and swollen scales posteriorly. Male genitalia ( Fig. 3 A) with tegumen narrowly subtriangular with angled shoulders, with group of dense setae posteriorly in dorsal 2/3. Uncus slender, bifid and flaring at apex with tips, curved outwardly. Socii small, short, pendant apically rounded, densely setose. Gnathos rising from about ventral 1/3 length of tegumen, moderately sclerotized, distally converging. Valva with large basal excavation and short, moderately slender neck; sacculus sparsely setose basally; outer surface of valva with enlarged, flattened bristles from end of sacculus to neck, some very large and twisted; cucullus sub-triangular, rounded dorsally, acutely angled ventrally and ending in a short stout spine, inner surface densely setose as neck. Anellus loosely surrounding base of phallus, cuplike dorsally; phallus moderately long, tapering towards apex, sharply upwardly bent by 90 ˚ at 2/5 from base, with several deciduous cornuti; juxta triangular, truncate ventrally. Female genitalia ( Fig. 4 A) with papillae anales densely setose; apophyses posteriores as long as apophyses anteriores; sternum VII with entrance to ostium in deep, U-shaped emargination of posterior margin, densely scaled, with microtrichia and sparse setae on sternum VII and emargination, with slightly curved transverse ridges anterior to ostium; lamella postvaginalis with spinulose patch; ostium bursae located near anterior margin of sternum VII, colliculum small; ductus bursae short, with longitudinal ridged sclerotized plate, inner surface medially with group of sparse spinules, anteriorly bifurcate with the blunt apex extending into corpus bursae; ductus seminalis arising from middle of ductus bursae. Corpus bursae ovate, spinulose except anteriorly and in area around signa; two signa of differing size, blade-shaped, gradually tapering to sharp point.

Holotype. 3. Thailand: Chanthaburi Prov.: Khao Kluea, 13 ˚ 05'49"N 102 ˚ 10'21"E, 166 m, 17 May 2009, N. Pinkaew; np 3083; KKIC slide no. NP 1530. Deposited in KKIC.

Paratypes. Thailand: Chanthaburi Prov.: 1 Ƥ, Khao Kluea, 13 ˚ 05'49"N 102 ˚ 10'21"E, 166 m, 17 May 2009, ( KKIC genitalia slide NP 1531Ƥ), N. Pinkaew. Deposited in KKIC.

Distribution. Thailand (Chanthaburi).

Etymology. The specific name is derived from Latin geniculatus (= bent knee), referring to the shape of the phallus.

Remarks. Two specimens from Australia have genitalia (ANIC genitalia slide No137243 and No13725Ƥ) identical to those from Thailand and only a few differences in forewing coloration. However, the large blackish brown fringe scales present at the base of the anal margin in the hindwing of the single Thai male is absent in the single Australian male. Because male sex scales are involved in producing scents for mating, the Australian specimens are not considered conspecific with the species described here.

Figures

FIGURE 1. Adults of Fibuloides spp. (Scale bar = 2 mm). A. F. geniculata Pinkaew and Zhang, n. sp. (holotype, male). B. F. geniculata Pinkaew and Zhang, n. sp. (paratype, female). C. F. khaoyai Pinkaew and Zhang, n. sp. (holotype, male). D. F. k h a - oyai Pinkaew and Zhang, n. sp. (paratype, female).

FIGURE 2. Sex scales on abdomen of male of Fibuloides geniculata Pinkaew and Zhang, n. sp. (KKIC slide no. NP 1530).

FIGURE 3. Male genitalia of Fibuloides spp. A. F. geniculata Pinkaew and Zhang, n. sp. (KKIC slide no. NP 1530). B. F. k ha - oyai Pinkaew and Zhang, n. sp. (KKIC slide no. NP 1528).

FIGURE 4. Female genitalia of Fibuloides spp. A. F. geniculata Pinkaew and Zhang, n. sp. (KKIC slide no. 1531). B. F. k h a - oyai Pinkaew and Zhang, n. sp. (KKIC slide no. 1529).