Fibuloides falcatus Siraphattarathamrong and Pinkaew, 2019

Siraphattarathamrong, Paphatpron, Muadsub, Sopita & Pinkaew, Nantasak, 2019, Descriptions of two new species of Fibuloides Kuznetsov, 1997 (Lepidoptera: Tortricidae: Eucosmini) from Thailand, Zootaxa 4590 (4), pp. 495-500 : 498-500

Fibuloides falcatus Siraphattarathamrong and Pinkaew , n. sp.

( Figs. 2 , 5–6 , 10 ¯12)

Diagnosis. This species is most similar to Fibuloides vaneeae in forewing pattern, but it differs in the shape of the uncus and cucullus in the male genitalia. The broad uncus and the sickle-shape cucullus of F. falcatus contrast with the slender, deeply bifid uncus and the long and narrow cucullus of F. vaneeae .

Description. Head ( Fig. 2 ): Upper frons light brown mixed with brown, lower frons yellowish white, light brown laterally; labial palpus with first segment white, second segment dilated apically, yellowish white, with dark brown at base, medially with transverse brown band, apicomedially with dark brown mark, apical segment slender, yellowish white with dark brown basal half.

Thorax: Pronotal collar brown mixed with dark brown; tegula brown, basal half mixed with dark brown; mesonotum brown, with transverse dark brown band medially. Forewing ( Figs. 5–6 ) length 5.6 mm in male (n = 1); costa evenly curved; costal strigulae well developed, greyish white separated by dark brown streak; termen concave below apex, male costal fold absent; ground color light brown with dark brown striae, basal patch irregular, brown mixed with dark brown; median fascia dark brown, extending obliquely from costa to base of R 5, margins irregular, beyond with four striae extending obliquely from costa to R 5, grey alternated with orange brown, apical 1/5 with irregular blackish scaling along wing venation of R 5 to CuA 1; termen with brown to dark brown line between R 5 and CuA 1, pretornal area with dark brown subtriangular mark extending from dorsum to between M 3 to CuA 1; underside light brown with greyish white spots along costa. Hindwing light brown, anal margin moderately sclerotized with group of long, light brown hair pencils beneath, originating from wing base, underside light brown.

Abdomen: Male genitalia ( Figs. 10 ¯12) with tegumen subrectangular, moderately sclerotized, basal 2/3 with dense scale sockets, with pronounced sinuate shoulders; uncus moderately large, basal half narrower with moderately dense scale sockets, apical half larger, widened bilobed with rounded apices, with shallow excavation dorsomedially, ventral margin with distinct V-shaped excavation, with protruding sclerotized subtriangular process, pointing upward; socii subtriangular, pendant ventrally, arising from base of uncus, ca. 1/4 length of tegumen with rounded apices, densely setose; arms of gnathos moderately sclerotized, weak at base, extending upward; juxta subtriangular; caulis short; anellus surrounding base of phallus; phallus moderately long, without cornuti; valva long and slender; sacculus with moderately dense scale sockets ventromedially, ventral margin with sparse long setae, with dense short setae medially from near basal excavation margin to near neck, ventrolateral margin with a row of short setae from angle of sacculus toward neck, outer surface with a series of long spiniform setae toward neck; neck narrow and curved, with sparse short setae on ventral margin; cucullus incised medioapically forming two lobes, dorsal lobe crescent-shaped with pointed apex, densely setose basally, ventral lobe larger, slightly widened toward rounded apex, densely setose except outer margin and apex.

Holotype. ♂. Thailand: Chiangmai ; Doi Suthep-Pui N.P., Pha Dum, 18°45′33″N, 98°53′28″E, ca. 1,412 m, Hill Evergreen forest, 6 September 2013, N. Pinkaew et al.; np 6010, genitalia slide no. NP 3743. Deposited in KKIC.

Distribution. Thailand (Chiangmai).

Etymology. The specific name is derived from Latin falcatus (= sickle-shape), referring to the shape of the cucullus.

Figures

FIGURES 1–2. Head of Fibuloides spp. 1. F. bacriora (holotype male). 2. F. falcatus (holotype male).

FIGURES 3–6. Adults of Fibuloides spp. (scale bars = 2 mm.) 3. F. bacriora (holotype male). 4. F. bacriora (paratype female). 5. F. falcatus (holotype male). 6. F. falcatus, sex scales on the underside of anal margin of hindwing.

FIGURES 10–12. Morphological features of male genitalia of Fibuloides falcatus (holotype). 10. Male genital capsule. 11. Uncus, socii and gnathos. 12. Phallus.