Lobesia bisacca Charoensub and Pinkaew, 2018

Charoensub, Thipmanee, Pinkaew, Nantasak & Sanguansub, Sunisa, 2018, A new species of Lobesia Guenée, 1845 from Thailand (Lepidoptera: Tortricidae: Oletheutinae), Zootaxa 4434 (2), pp. 381-384 : 381-384

Lobesia bisacca Charoensub and Pinkaew , n.sp. ( Figs. 1–7 )

Type material. Holotype: (♂), THAILAND, Trat Province, Trat Agroforesty Research Station , 12°23'34"N, 101°40'00"E, ca. 46 m, 16–19 Sep 2010, N. Pinkaew, np4719 (genitalia slide NP3466).

Paratypes (2♂): THAILAND, Trat Province, Trat Agroforesty Research Station , 12°23'43"N, 101°40'32"E, ca. 30 m, 17–18 Feb 2012, N. Pinkaew, np5394 (genitalia slide NP1572), 24–25 Dec 2012, N. Pinkaew, np4904 (genitalia slide NP1571).

Diagnosis. The new species is most similar to L. siamensis Bae, 1995 in wing pattern but differs in features of the male genitalia. The sacculus of L. bisacca has a protruding process from the base of the valva that is distinct from that of all other congeners. The apex of this process is divided into two parts: an upper part that is clavate and slightly curved, comprised of two short, curved, strong spines apically, and a ventral part that is subtriangular with a pointed apex.

Description. Adult ( Fig. 1 ). Head: Lower frons yellowish white, upper frons and vertex pale brown; labial palpus porrect ( Fig. 2 ), first segment white, second segment expanded apically, pale brown, with narrow blackish mark dorsobasally, with irregular, transverse band apically, third segment short, pale brown; antenna long, reaching beyond middle of forewing costa, each flagellomere with basal half brown and apical half dark brown. Thorax: Pronotal collar dark brown; tegulae with alternating band of brown and dark brown; mesonotum brown, with pale brown, transverse band anteriorly; posterior scale tufts dark brown; hind tibia with long, yellowish white hairpencil on inner margin, originating from base of tibia. Forewing length 4.4–4.5 mm (n = 3); costal margin nearly straight in basal half, slightly convex in apical half, with well-developed system of strigulae, rounded apically, termen oblique, weakly convex; ground color gray; basal patch with dark brown, irregular, transverse fascia; median patch subtriangular, pale brown to dark brown, inner margin relatively straight, extending from middle of costa to dorsum, outer margin extending outward from middle of costa to base of M2 and then inward to near middle of dorsum; preterminal patch extending obliquely outward from costa beyond median patch to termen between M2 and M3, brown mixed with dark brown, broken by a sinuate, narrow, dark brown line extending from costa to irregular subtriangular pretornal patch, brown to dark brown; forewing apex with a sinuate, dark brown, narrow line extending from costa to termen at M1, with small dark brown spot at apex; underside grayish brown with row of yellowish white spots along costa. Hindwing subtriangular, mostly translucent, covered with sparse hair-like scales, pale brown, except covered with dense brown scales along costa to apex; underside pale brown along costa to apex, remainder pale gray. Abdomen: Male with a pair of elongate patches of modified scales on sternum II ( Fig. 7 ). Male genitalia ( Fig. 4 ) with uncus absent; tegumen moderately sclerotized, rounded apically, with small, subtriangular apodeme of muscle m4; socii ovate, moderately wide, rounded apically, densely setose; gnathos arising near middle of tegumen, moderately sclerotized, protruding upward; anellus surrounding base of phallus; vinculum weakly sclerotized; juxta small, subtriangular; caulis moderately long; phallus ( Fig. 6 ) cylindrical and parallelsided, long, strongly curved in basal half, slightly curved dorsoapically in apical half, with moderately long, pointed apically; valva long, sacculus ( Fig. 5 ) small, with moderately long, protruding process extending outward, slightly widened to apex, with sparse scale sockets, apex strongly concave and sclerotized, divided into two parts, upper part clavate, rounded apically, with two strong curved spines apicoventrally, ventral part subtriangular, pointed apically; cucullus long, ca. 1.5 times length of sacculus, cylindrical, moderately curved, rounded apically, densely setose on ventral half, reaching apex. Female unknown.

Distribution. Thailand (Trat)

Etymology. The specific epithet " bisacca " refers to the divided process of the sacculus.

Remarks. Specimens were collected in lowland dry evergreen forest at the Trat Agroforestry Research Station, at an elevation of 30– 46 m.

Figures

FIGURES 1–3. Adult of Lobesia bisacca n.sp. 1. Holotype male. 2. Head of holotype. 3. Hind tibia with hairpencil (arrow) (scale bar = 2.0 mm).

FIGURES 4–7. Male genitalia and abdomen of Lobesia bisacca n.sp. 4. Male genitalia, slide No. NP3466, holotype. 5. Protruding process from base of sacculus. 6. Phallus. 7. Abdominal sternum I+II with scale patches (arrows).