Orseolia caulicola Gagné

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 : 49-50

Orseolia caulicola Gagné

[ Figs 27 a–g]

Parallelodiplosis javanica Felt, 1921d: 91 .

Orseolia caulicola Gagné, 1973: 507 , new name for P. javanica , (junior secondary homonymy); Gagné 1985: 139, revision.

Material examined. Lectotype male designated by Gagné (1985: 139), and male and 2 female paralectotypes, reared from leaf sheath gall on Sacciolepis indica (L.) Chase (as Panicum indicum L.) ( Poaceae ) in Bogor, Java, Indonesia, vi-1920, Felt type #a3150. We examined the males which are mounted as whole, cleared insects on a single slide, with all characters preserved except the barely observable circumfila.

Description. Adult. Wing as in Fig. 27b . Palpus 4-segmented [ Fig. 27c ]. Tarsal claws simple, narrow, bent at distal third, as long as empodia [ Fig. 27g ].

Male. Flagellomeres as for genus [ Fig. 27e ], last flagellomere with apical extension [ Fig. 27f ]. Terminalia [ Fig. 27d ]: gonostylus short, strongly tapered, setulose except immediately next to distal tooth where carinate; cerci triangular, wide; hypoproct conical, slightly tapered; aedeagus narrow, as long as hypoproct, with several asetose sensilla on distal half.

Female. Tergum 10 with numerous short lateral setae, more similar to O. paspali than to less densely setose in O. oryzae [ Fig. 31f ], cerci as in O. oryzae [ Fig. 31e ] ( Gagné 1985 ).

Pupa, larva unknown.

Remarks. Orseolia caulicola is morphologically similar to O. oryzae and its close relatives O. eragrostisae (Mani) , O. similis (Mani) , O. difficilis Gagné and O paspali ( Gagné 1985) .

Biology. This gall midge causes a leaf sheath gall on Sacciolepis indica (L.) Chase described by DvLR & DvL (1926) as Hymenachne indica Buese. (= Panicum indicum L), gall No 59, Fig 36 . [ Fig. 27a ]). The slender white or greenish gall tubes develop chiefly in the inflorescences. Leaf buds grow between the flowers in the axils of the leaves of the flower stalks and the leaf ends of these buds change into galls. The galls occur also in axillary buds on the main stems and side branches.

Geographical distribution. This species is known from its type locality in Bogor , Java, where it was collected vi-1920 (DvLR & DvL 1926) .

Figures

FIGURES 27a–g. Orseolia caulicola: a, gall on Sacciolepis indica (arrows indicate galls; Fig. 36 of DvLR & DvL (1926), gall No 59); b–g, male: b, distal part of wing; c, palpus; d, terminalia (dorsal); e, 3rd flagellomere (circumfila partly obscured on specimen); f, 12th flagellomere; g, claw and empodium.

FIGURES 31a–j. Orseolia oryzae: a, gall on Oryza sativa in India (arrow indicates gall; photo from NICRA, 2011); b, male terminalia (dorsal); c, 3rd male flagellomere; d, 3rd female flagellomere; e, female 10th tergite and cerci (dorsolateral; arrow indicates pair of thick setae on cercus; Karawang, Java, Indonesia); f, female 10th tergite (Cuttack, Odisha, India); g, claw and empodium; h, wing; i, female head; j, female flagellomeres 3–12. Fig. b from Harris & Gagné (1982), Figs c–f from Gagné (1985).

FIGURES 36a–l. Schizomyia laporteae: a, gall on Laportea stimulans (Fig. 74 of DvLR & DvL 1910b); b, same (Fig. 221 of DvLR & DvL (1926)); c, apex of gonopod (ventral); d–f: pupa: d, head; e, thoracic spiracle; f, abdominal tergum 6 (lateral); g, female first tarsomere; h, male palpus; i–l, female: i, tarsal claw and empodium; j, ovipositor apex; k, 3rd flagellomere; l, antenna.