Gynodiplosis humata Felt, 1927

Kolesik, Peter & Gagné, Raymond J., 2020, A review of the gall midges (Diptera: Cecidomyiidae) of Indonesia: taxonomy, biology and adult key to genera, Zootaxa 4847 (1), pp. 1-82 : 32-33

Gynodiplosis humata Felt, 1927

[ Figs 16 a–i]

Gynodiplosis humata Felt, 1927a: 383 .

Material examined. Syntypes, male, female, reared from Davallia repens (L.fil.) Kuhn [as Humata alpina Moore in Felt (1927a) and H. repens Diels in DvLR & DvL (1941)], collected at Mt Gede, Cibodas, Java, alt. 1500 m, 13- i-1926, Felt #a3448). Felt’s types are mounted in lateral position as whole, uncleared, on separate slides.

Description. Male. Length 3 mm ( Felt 1927a). Antenna: scape widened distally, as long as wide distally; pedicel oval, longer than wide; flagellomeres: [ Fig. 16f ] first and second not fused, basal node round, as wide as long, internode half-length basal node, distal node slightly constricted at mid length, twice as long as wide, neck as long as internode, length of circumfilar loops closely embracing flagellomere: basal loops reaching mid length of internode, middle loops reaching base of distal loops, distal loops reaching end of neck; nodes densely covered with microtrichia, internode with few microtrichia. Palpus 1-segmented, 1.5x longer than wide [as in Fig. 16g ]. Wing length 3.5 mm, width 1.4 mm [ Fig. 16b ]. Tarsal claws with two basal teeth, the distal tooth about half size of claw, the proximal variable in size, ranging from half to same size of distal tooth, even on same leg [ Figs 16d, e ]. Terminalia as for genus [ Fig. 16c ].

Female. Length 4 mm ( Felt 1927a). Wing length 4.0 mm, width 1.5 mm. Flagellomere [ Fig. 16i ] similar to male. Terminalia as for genus [ Fig. 16h ].

Pupa, larva unknown.

Biology. This species causes a leaf gall on the fern Davallia repens (L.fil.) Kuhn ( Davalliaceae ) described by DvLR & DvL (1926, gall No. 14, Fig. 8 [ Fig. 16a ]). The spherical gall is attached by a short pedicel to the upper side of a secondary leaf vein. Leaflets surrounding the gall are distorted and may be shaped into a kind of calyx surrounding the base of the gall. The gall is glabrous, thick and solid and surrounds a spacious larval chamber.

Geographical distribution. Gynodiplosis humata is known from Java where it was found at Mt Tangkuban Perahu, near Bandung, Java, alt. 1600 m, vi-1915 and Mt Gede , Cibodas, alt. 1400 m, i-1925 (DvLR & DvL 1926) .

Figures

FIGURES 8a–i. Asphondylia vitea: a–b, galls on Cayratia trifolia from the Philippines (Figs VIII-4 & VIII-6 of Uichanco (1919)); c, gall on C. trifolia from Indonesia (Fig. 636 of DvLR & DvL (1926)); d, palpus; e, first tarsomere; f, male terminalia (dorsoposterior); g, 6th male flagellomere (only part of circumfila visible in type specimen); h, wing; i, tarsal claw of front leg with empodium. Insect drawings made from types reared in the Philippines.

FIGURES 16a–i. Gynodiplosis humata: a, gall on Davallia repens, at top left cross section of gall containing pupa (Fig. 8 of DvLR & DvL (1926)); b–f, male: b, wing; c, terminalia (lateral); d–e, last tarsal segment of midlegs of same specimen, with claw, empodium and pulvillus; f, 4th flagellomere; g–i: female, g, palpi; h, end of ovipositor (lateral); i, 4th flagellomere.