Fustis extuta Fibiger

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 48-49

Fustis extuta Fibiger , new species

( Plate 6 , figure 3; male genit. plate 15, figure 5)

Material examined. Holotype: male, N Thailand, 30 km N Mae Hong Son, Karen village , 1100 m, 16.vii.2003, leg., coll., and genit. prep. 4987 M. Fibiger, later to be deposited in ZMUC.

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

Head, patagia, anterior part of tegulae, prothorax, basal part of costa, triangular patch of medial area, and terminal area, including fringes: black.

Forewing ground colour: beige, suffused with light brown scales.

Abdomen: dark grey, with dorsal tuft on basal segment.

Crosslines: untraceable, terminal line marked by black interneural dots.

Reniform stigma: beige, broad ovoid, black outlined.

Hindwing: beige; with narrow brown terminal line and indistinct discal spot; fringes white basally, otherwise beige.

Underside: forewing grey brown, hindwing grey, with indistinct discal spot.

Male genitalia. Tegumen: long, medially narrow; basally and dorso-laterally broad, platelike.

Vinculum: two branched; centre one barlike; posterior one branchlike, not curved.

Saccus: short; broadly U shaped.

Valvae: relatively short and broad, slightly asymmetrical.

Anellus plate: prominently asymmetrical; relatively long, free, curved, heavily sclerotised, long brushlike structure; one side clothed with stout setae (apo.).

Juxta: trapezoid, with medial cleft on dorsal side.

Phallus: coecum short and broad, with rounded base, broadest by ductus ejaculatorius, subapically smoothly and downwards S curved to tip (apo.).

Vesica: armed with small plate.

Differential diagnosis. F. extuta differs from other Fustis species in:

- relatively narrow wings;

- yellow ground colour, with contrasting wing pattern;

male genitalia, in

- shape of bilobed ampulla, with pointed tip at both ends;

- anellus large, subapically curved, long brushlike; and

- subapically S shaped, tapered phallus.

Distribution. F. extuta known only from North Thailand.

Figures

PLATE 6. Figures 1–8. Fustis, Bruma, Costasensora, and Longiantrum species, adults. 1, F. sensora, male, Thailand N, Chiang Mai; 2, F. biextuta, male holotype, Thailand, Tham Sakoe Nat P.; 3, F. extuta, male holotype, Thailand, Mae Hong Son; 4, F. gregerseni, male holotype, Thailand W, Uthai Thani; 5, F. s-forma, male holotype, Thailand NE, Ban Nam Lee Pattana; 6, F. papei, female holotype, Thailand, Nakhon Nayok; 7, Bruma parvus, male holotype, Indonesia, North Sumatra; 8, Costasensora honeyi, male holotype, Malaysia, Sarawak.