Tactusa topi Fibiger, 2010

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 24-25

Tactusa topi Fibiger , new species

( Plate 2 , figure 7; male genit. plate 13, figure 3)

Material examined. Holotype: male, China, Guangdong, Canton, Pak-man-shan, 21.vii.-, leg. R. Mell , genit. prep. 3254 M. Fibiger, coll. ZMHB.

Taxonomic notes. T. topi is a member of the T. nieukerkeni species-group, which has a blackish triangular or quadrangular patch between the antemedial and postmedial lines, the typical Tactusa ampulla, and features listed under the species-group and individually for the species below.

Diagnosis. Imago (external). Wingspan: 11 mm.

Forewing: ground colour light yellow, with quadrangular blackish patch in upper medial area; prominently broad black subterminal area.

Crosslines: only subterminal and terminal lines marked; former inwardly outlined by light yellow, latter with black interneural spots.

Reniform stigma: marked, white, brown outlined.

Hindwing: dark grey, with discal spot.

Underside: unicolorous grey.

Male genitalia. Tegumen: relatively strongly built.

Vinculum: even more strongly built.

Saccus: short; strongly built, U shaped.

Fultura superior: membranous.

Valva: slightly asymmetrical, left one broader.

Ampulla: forming a cross with axis of valva; slightly asymmetrical; broadest by valva; dorsal arm with long, upturned, tapered, pointed process (apo.).

Digitus: present; strongly asymmetrical; on right side fingerlike, on left humplike (apo.).

Juxta and anellus plate: asymmetrical, fused.

Phallus: strongly tapered from ductus ejaculatorius outwards; strongly upturned and subapically curved.

Vesica: unarmed.

in shape of ampulla with a long, tapered process, and strongly asymmetrical digitus.

Distribution. Single known specimen was taken in China, Prov. Guangdong.

Figures

PLATE 2. Figures 1–8. Tactusa species, adults. 1, 2, T. nilssoni, male holotype, Thailand, Phuket, and female paratype, with same data; 3, T. ostium, female holotype, Thailand, Nakhon Naoyk; 4, T. peregovitsi, male holotype, Vietnam N, Nghe Aniwan; 5, T. flavoniger, female holotype, Laos, Vientiane; 6, T. nieukerkeni, male holotype, Vietnam, Vinh Phuc; 7, T. topi, male holotype, China, Guangdong, Canton; 8, T. incognita, male holotype, Thailand, Nakhon Naoyk.