Oligoxenomyia Felt

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 : 47-48

Oligoxenomyia Felt

[ Figs 25 a–n]

Oligoxenomyia Felt, 1927b: 386 .

Type species: Oligoxenomyia radicis Felt , by original designation.

Diagnosis. This monotypic genus belongs to the supertribe Cecidomyiidi and is notable for the large, weakly sclerotized gonostylar tooth that is set perpendicularly on the gonostylus. It remains at present unassigned to tribe.

Description. Adult. Wing with R 5 straight, joining C slightly behind wing apex; C broken at juncture with R 5; Rs not present; M 4 and Cu 1 forming fork [ Fig. 25a ]. Flagellomeres 12; in male foreshortened with two indistinct nodes, proximal node with one, distal with two whorls of circumfila, all with loops shorter than distance between them, internode partially setulose [ Fig. 25b ]; in female cylindrical, circumfila of two horizontal and two vertical appressed bands [ Fig. 25i ]. Palpus 3-segmented [ Figs 25g, h ]. Tarsal claws simple, strongly bent near basal third, empodia shorter than claws [ Fig. 25f ]. Male terminalia [ Figs 25 c–e]: gonostylus broad, basal 2/3 asetose and setulose, distal third with sparse, short setae and no setulae, tooth set at strong angle to shaft, large, weakly sclerotized, carinate, with scattered short setae; aedeagus narrow in lateral view, about as long as cerci and hypoproct, recurved dorsally, rounded apically, with apical asetose sensilla.

Ovipositor [Figs, 25j, k] retractable, cerci round in lateral view, setose, setulose, with pair of prominent dorsoapical, thick, blunt setae much longer than surrounding setae; hypoproct about third length of cerci, rounded apically with pair of distal setae. Pupa with large antennal horns [ Fig. 25l ], prothoracic spiracle long [ Fig. 25m ].

Figures

FIGURES 25a–n. Oligoxenomyia radicis: a, wing; b–g, male: b, 3rd flagellomere; c, terminalia (mesolateral); d, gonostylus (ventral); e, gonostylus (dorsal); f, claw and empodium; g, palpus; h–k, female: h, palpus; i, 3rd flagellomere; j, ovipositor (lateral); k, cercus and hypoproct (lateral); l–m, pupa: l, antennal horns and cervical papillae (ventral); m, prothoracic spiracle; n, aerial root gall on Freycinetia imbricate (Fig. 24 of DvLR & DvL (1926)).