Fustis gregerseni Fibiger

FIBIGER, MICHAEL, 2010, Revision of the Micronoctuidae (Lepidoptera: Noctuoidea) Part 3, Taxonomy of the Tactusinae, Zootaxa 2583 (1), pp. 1-119 : 49-50

Fustis gregerseni Fibiger , new species

( Plate 6 , figure 4; male genit. plate 15, figure 6)

Material examined. Holotype: male, W Thailand, Uthai Thani Distr., Khao Nang Rum , 400 m, 26– 27.i.1987, leg. M.G. Allen, BM 1986 – 300 , genit. prep. 3765 M. Fibiger, coll. BMNH.

Diagnosis. Imago (external). Wingspan: 14.5 mm (apo.).

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

Forewing: long and narrow, with pointed apex, beige ground colour suffused with few light brown scales.

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

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

Reniform stigma: beige, ovoid, black outlined.

Hindwing: beige, with narrow brown terminal line with indistinct discal spot; fringes beige.

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

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

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

Saccus: relatively long; broadly V-shaped.

Valvae: slightly asymmetrical.

Ampulla: bilobed; slightly asymmetrical; lobes tapered: dorsally broad fingerlike; ventrally broad and rounded; outer edge curved throughout (apo.)

Digitus: small, broad, quadrangular.

Anellus plate: basally asymmetrical, platelike; upwards extremely long, free, and subapically sharply angled, before tapered and upturned, pointed tip; heavily sclerotised rodlike structure; all free structures clothed with stout setae (apo.).

Phallus: coecum relatively long and smoothly rounded; broadest at large, triangularly process at tip; almost straight (apo.).

Vesica: armed with a small, slightly curved, heavily sclerotised rectangular plate (apo.).

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

- large size;

- shape of ampulla, especially rounded very wide and long ventral arm;

- long, apically upturned, pointed anellus;

- phallus with large and triangular process at tip; and

- vesica with rectangular heavily sclerotised plate.

Distribution. F. gregerseni known only from W 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.