Thorodiplosis impatientis 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 : 69-71

Thorodiplosis impatientis Felt

[ Figs 40 a–j]

Thorodiplosis impatientis Felt, 1921d: 89 .

Material examined. Type male and female reared from a marginal roll on the upper leaf surface of Impatiens platypetala Lindl. (Fig. 599 [ Fig. 40a ] in DvL & DvLR (1918)), at Mt Gede, Cibodas , Java, 15-vii-1920 ( NYSM #a3153). Felt’s two slides contain two males and two females, all mounted whole and uncleared, with most body parts present but partially shriveled .

Description. Male. Wing length 1.6 mm, width 0.6 mm. Antenna: basal node slightly longer than wide, internode as long as basal node, proximal node 1.5x length basal node, neck 2x length basal node [ Fig. 40i ]. Terminalia: gonocoxite splayed with low mesobasal lobe, gonostylus as long as gonocoxite, curved at distal third, setulose at basal third, carinate and setose beyond [ Figs 40h j ].

Female. Wing length 2.2 mm, width 0.8 mm. Antenna as in Figs 40c, d . Terminalia: cerci setulose, sparsely setose, with pair of long, blunt, closely set sensory hairs at apex [ Fig. 40f ].

Pupa, larva unknown.

Biology. This species causes a marginal roll on the leaf of Impatiens platypetala (Balsaminaceae) [ Figs 40a, b ]. The gall is figured in DvL & DvLR (1918, gall No. 599, Fig 599 [ Fig. 40a ]) and described by DvLR & DvL (1926) as follows. The margin of the leaf is rolled up for a small part of its length. The infected parts are white or yellowish and considerably thickened. The gall can be common locally.

Geographical distribution. This species was reported from Java (DvLR & DvL 1914, 1918; Felt 1921; DvLR & DvL 1926, 1941) from the following localities: Pagergunung , alt. 900 m, ix-1911 ; Paseh, near Bandung , alt. 1000 m, xii-1915 ; Ciharum, near Cibeber , alt. 1200 m, vi-1916 ; Mt Slamet , alt 800 m, v-1918 ; Cisarua, near Cimahi , alt. 1300 m, v-1918 ; Mt Gede, Cibeureum , alt. 1700 m, ii-1916 ; Mt Gede, Cibodas , alt. 1400 m, ix-1918 ; alt. 1500 m, 15-vii-1920; alt. 2000 m, vii-1928; Mt Pangrango , alt. 2300 m, vi-1920 ; Mt Salak , alt. 800 m, vi-1918; vii-1920; x- 1921 ; Mt Cikuray , alt. 1600 m, v-1925 ; Maseng, near Bogor , alt. 600 m, vi-1925 . Additionally, Purnama Hidayat and Mahindra Dewi Nur Aisyah ( IPB University ) (pers. comm., Fig. 40b ) found the galls at Mount Gede Pangrango National Park , Cianjur (6°52’33”S, 106°58’04”E), alt. 1407 m, 17-iv-2018 ; Kertajaya, Pasirkuda, near Cianjur (7°14’38”S, 107°10’24”E), alt. 504 m, 10-iv-2018 ; Pagelaran, near Cianjur (7°17’45”S, 107°7’7”E, alt. 967 m, 13- iv-2018; Mt Sari , Pamijahan , Bogor (near Mt. Bunder ) (6°41’23”S, 107°12’01”E), alt. 967 m, 17-iii-2018.

Species unplaced to genus

The following three species are too incompletely known to be placed in existing genera or to describe new genera for them. Their types were reared from distinctive galls on known plants, therefore more specimens should someday be found on which to base proper descriptions.

Figures

FIGURES 40a–j. Thorodiplosis impatientis: a–b, galls on Impatiens platypetala: a, galls indicated with arrows (Fig. 599 of DvL & DvLR 1918); b, Cianjur near Mt Gede (photo by Purnama Hidayat and Mahindra Dewi Nur Aisyah, 2018); c–g, female: c, 1st and 2nd flagellomeres; d, antenna; e, tarsal claw and empodium; f, cerci and hypoproct (lateral); g, posterior part of wing; hj, male: h, terminalia (dorsal); i, 6th flagellomere (circumfila not visible on types); j, aedeagus of both type specimens (dorsal).