Bruggmanniella bursaria (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 : 23

Bruggmanniella bursaria (Felt) . New combination.

[ Figs 10 f–m]

Asphondylia bursaria Felt, 1927b: 387 .

Material examined. Syntypes, 5 males, 9 females and pupa(e) ( NYSM #a3393), on two slides, reared from stem galls on Symplocos fasciculata Zoll. collected at Mt Gede , Cibodas , near Bogor, Java, Indonesia, altitude 1500 m, ii-1925. The adults are on two slides, one with 2 males and 5 females, the other, 3 males and 4 females, all uncleared and mounted laterally. No pupa appears on either slide so is evidently lost .

Description. Male. Length 2 mm ( Felt 1927b). Wing length 2.5 mm, width 1.2 mm (1.2–1.3). Head. Antenna with scape 1.5x longer than wide, 2x length pedicel; pedicel wider than long; flagellomeres 12 in number, evenly cylindrical, 3x longer than wide, slightly constricted at basal third [ Fig. 10i ]; circumfila comprising four wavy longitudinal bands connected by high loops anteriorly and low loops posteriorly. Palpus 2-segmented, second segment slightly shorter and narrower than first [ Fig. 10j ]. Wing with C ending near wing apex, R 1 ending slightly anteriorly of wing midlength. Tarsal claws simple, narrow, bent at distal third, empodia reaching bend in claws [ Fig. 10g ]; pulvilli minute. Apicoventral spur on first tarsomere robust, short, bent at right angle [ Fig. 10h ]. Gonostylus with two separate teeth, one more pointed than the other [ Fig. 10f ].

Female. Length 2.5 mm ( Felt 1927b). Wing length 2.6 mm (2.5–2.7), width 1.4 mm (1.3–1.4). Flagellomeres 10–12 progressively shortened [ Fig. 10m ], circumfila sparse, comprising three wavy longitudinal bands connected by low loops at either end. Needle-like protrusible part of ovipositor about 2x longer than seventh sternite [ Figs 10k, l ].

Pupa, larva unknown.

Remarks. Known only from the adults, B. orientalis could fit in either Bruggmanniella or Pseudasphondylia , genera defined on the basis of larval and pupal characters ( Gagné 1994 ; Elsayed, pers. comm.). We tentatively combine this species with the older generic name, Bruggmanniella .

Biology. Bruggmanniella bursaria induces a stem gall on Symplocos fasciculata (Symplocaceae) , described and illustrated by DvLR & DvL (1926, gall No. 1216 Fig. 877 [ Fig. 10n ]). On young stems, irregular outgrowths develop that are about 3 mm across, each containing an oval larval chamber lined with fungal tissue. The galls are often arranged gregariously, giving an appearance of a complex gall 50–100 mm in length. Affected stems are often bent or curved. Pupation takes place in the gall.

Geographical distribution. The currently known range comprises three localities in the Bogor area, Java (DvLR & DvL 1926): Mt Gede, Cibodas, altitude 1500 m, collected by M. E. Jacobson ii-1916, ix-1918, xii-1918 and ii-1925; Mt Panisian, near Bogor, altitude 700 m, xii-1923; Mt Salak, Gunung Bunder, altitude 1000 m, viii- 1925.

Figures

FIGURES 10a–e. Bruggmanniella orientalis: a, gall on Phoebe declinata (Fig. 331 of DvLR & DvL (1926)); b, male last tarsal segment with claw and empodium; c, male first tarsal segment; d, male palpus; e, gonostylus (posterior). Figs 10f–m. Bruggmanniella bursaria: f, gonostylus (dorsal); g, male last tarsal segment with claw and empodium; h, male first tarsal segment; i, male last 6 flagellomeres; j, female palpus; k, ovipositor (lateral); l, apex of ovipositor (lateral); m, female last six flagellomeres; n, gall on Symplocos fasciculata (Fig. 877 of DvLR & DvL (1926)). Arrows indicate hypertrophic bark tissue (hb), apex tube containing larval chamber (tl), single gall (sg).