Okriomyia omalanthi ( Skuse, 1890 )

Kolesik, Peter & Gagné, Raymond J., 2016, Revision of early taxa of Australian gall midges (Diptera: Cecidomyiidae), Zootaxa 4205 (4), pp. 301-338 : 324

Okriomyia omalanthi ( Skuse, 1890)

[ Fig. 2 b]

Cecidomyia (Hormomyia) omalanthi Skuse, 1890: 383 .

Okriomyia omalanthi , new combination by Kolesik (2014: 10).

Material studied. Holotype female ( ANIC 29-38491 ), “ Mount Kembla , Illawara District, N.S.W. (Skuse).” The abdominal fragment of the pupal exuviae glued on the card next to the holotype was also mounted and designated as paratype ( ANIC 29-38492 ) .

Associated galls. The type was “bred from dark, brown woody, smooth, somewhat shining, globular, hollow galls, 5 mm. in diameter, found in clusters along the midrib of the leaves and in dense masses around the stems of Omalanthus populifolius ; obtained in the month of November. The galls were ripe when collected, and the imago emerged a few days later. The larva does not conduct a cocoon, and on the emergence of the imago the pupa-case is left hanging to the gall”, in ANIC. The mounted holotype female retains the wings, head with with one entire antenna and one with terminal flagellomeres missing, and abdomen with folded terminalia inside.

Description. Female. Wing 3.4 mm long, 1.3 mm wide. Eye bridge 3-4 facets long, occipital protuberance absent; palpus 4-segmented, without palpiger; flagellomeres 12, with low dense network-like circumfila; claws simple, as long as empodia; first tarsomere without apical spur; terminalia fleshy, with 2 round cerci.

Pupa. Abdominal segments 2–8 anterodorsally with field of strong one- to six-pointed spines.

Remarks. This species has to be redescribed once more material becomes available. The holotype and the associated pupal skin, even though both substantially damaged, differ from Okriomyia schwarzi and O. flabellidentata , Australian species feeding on Eucalyptus ( Kolesik 1998) . In O. omalanthi the eye bridge is 3-4 facets long and the pupal abdominal dorsal spines have up to six points; in O. schwarzi and O. flabellidentata the eye bridge is 6-8 facets long and the pupal abdominal dorsal spines have only one to two points.

Figures

FIGURE 2. (a) Galls of Lasioptera miscella Skuse on leaf stalks of Eucalyptus haemastoma, (b) leaf galls of Okriomyia omalanthi (Skuse) on Omalanthus populifolius, (c) stem galls of Daphnephila glandifex Kieffer on Machilus gamblei (Lauraceae) from India which Edwards (1916) stated resembled galls of Asphondylia hilli Edwards, (d) flowers galls of Dasineura dielsi Rübsaamen on Acacia cyclops, (e) galls of Cecidomyia eucalypti Skuse (unplaced Cecidomyiinae) on stems of Eucalyptus haemastoma, (f) galls of Mesodiplosis callitridis Kolesik on branch shoot tips of Callitris endlicheri from which the inquiline Gladiodiplosis frenelae (Skuse) was reared, (g) flower galls of Dasineura acaciaelongifoliae (Skuse) on Acacia longifolia, (h) leaf galls attributed to Cecidomyia parilis Skuse (nomen dubium) on Eucalyptus corymbosa, (i) leaf galls of Heteropeza transmarina Schiner (unplaced Cecidomyiinae) on Callistemon sp., (j) flower and vegetative bud galls of Dasineura frauenfeldi (Schiner) on Leptospermum laevigatum. Left: original figure from Schiner (1868); centre: galls collected with type series in 1858; right: galls collected by Kolesik at Queenscliff, Victoria, in 2008. Figures a, b, e – h from Skuse (1890); c from Kieffer (1913 b); d from Rübsaamen (1916); i, j (left) from Schiner (1868).