Fustis sensora Fibiger

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 46-47

Fustis sensora Fibiger , new species

( Plate 6 , figure 1; male genit. plate 15, figure 3)

1986-74, genit. prep. 3194 M. Fibiger, coll. BMNH.

Diagnosis. Imago (external). Wingspan: 12 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, except weak antemedial line and terminal line marked by black interneural dots.

Reniform stigma: beige, ovoid, black outlined.

Hindwing: beige; with narrow brown terminal line; fringes white basally, otherwise beige.

Underside: forewing grey brown, hindwing grey.

Male genitalia. Tegumen: long, laterally narrow, dorso-laterally broad, platelike.

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

Saccus: short; broadly V shaped.

Valvae: asymmetrical; subapically with prominent, triangular, broad-based process (apo.).

Ampulla: slightly asymmetrical; similar to head of ‘Snoopy’ (cartoon dog); tapered towards dorsal tip (apo.).

Digitus: small, triangular, apically setose.

Anellus plate: prominently asymmetrical; with very long, free, medially curved, heavily sclerotised clublike structure; head of club clothed with stout setae (apo.).

Juxta: trapezoid, with medial cleft on dorsal side.

Phallus: coecum short and very broad; broadest by ductus ejaculatorius; smoothly and upwards strongly curved 80 o to pointed tip (apo.).

Vesica: unarmed.

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

- narrow wings, with pointed apex;

- beige-brown ground colour, with contrasting wing pattern;

male genitalia, in

- shape of ampulla, ventral broad, rounded end, and dorsal pointed arm;

- very large, medially curved, brushlike anellus; and

- long, curved, tapered phallus.

Distribution. F. sensora known only from N. Thailand, Chiang Mai.

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.