Orseolia paspali (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 : 56-57

Orseolia paspali (Felt)

[ Figs 32 a–k]

Parallelodiplosis paspali Felt, 1921d: 92 .

Orseolia paspali (Felt): Gagné 1973: 507 , new combination.

Material examined. We examined Felt’s male lectotype, des. by Gagné (1985: 150) and 1 male, 2 female and 1 pupal paralectotype s reared from a leaf sheath gall on Paspalum scrobiculatum L. (as P. scrobiculatum Hook. ) in Bogor, Java, Indonesia, vi-1920, Felt type #a3151. The lectotype is mounted whole, cleared, with terminal flagellomeres missing, gonocoxites partially folded, gonostylus mounted at angle, wings folded, legs intact, head partially shriveled. The male paralectotype, mounted with the lectotype on the same slide, has all flagellomeres preserved and all tarsi missing.

Description. Wing length 2.5–2.9 mm in male, 2.8–3.5 mm in female Gagné (1985). Palpus 4-segmented, palpiger present [ Fig. 32k ]. Tarsal claws [ Fig. 32c ]. Male flagellomeres [ Fig. 32b, d ]. Male terminalia [ Figs 32 e–j]: gonostylus wide, distal edge constricted at midlength, setulose on basal half, carinate beyond, tooth large; hypoproct long, wide; aedeagus narrow, as long as hypoproct; cerci triangular.

Remarks. Orseolia paspali is similar to O. oryzae from which it can be separated by the gonostylus that is constricted at midlength and setulose on its basal half [ Figs 32e, f ], as opposed to gradually tapered and almost entirely setulose [ Fig. 31b ]. The female tergum 10 has more numerous setae than O. oryzae [ Fig. 31f ] ( Gagné 1985).

Biology. This species causes a 10–15 cm long and 2 mm wide, tubular leaf sheath gall, similar to Orseolia oryzae , on Paspalum scrobiculatum L. ( Poaceae ) (DvLR & DvL (1926, gall No 66, Fig. 40 [ Fig. 32a ]) and P. conjugatum P.J.Bergius ( Gagné 1985) .

Geographical distribution. Orseolia paspali occurs in Indonesia and India. In Indonesia it was found only in the type locality Bogor, alt. 250 m, v-1920, on P. scrobiculatum (DvLR & DvL 1926). In India it is common, with the following confirmed localities (all from Gagné 1985): Kannur, Kerala, 20–30-viii-1928, on P. scrobiculatum ; Allahabad, Uttar Pradesh, 1973, as laboratory colony on P. scrobiculatum ; Orissa, Cuttack, Odisha, 1979, on Paspalum sp.; Jabalpur, Madhya Pradesh, 1948, on P. scrobiculatum ; Raipur, Bhopal, Madhya Pradesh, 1981, on Paspalum sp.; Goa, 1981, on Paspalum sp.

Figures

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 32a–k. Orseolia paspali: a, gall on Paspalum scrobiculatum (arrow indicates gall; Fig. 40 of DvLR & DvL (1926)); b–k, male: b, 12th flagellomere; c, claw and empodium; d, 6th flagellomere; e, gonostylus (dorsal); f, gonostylus (ventral); g, cerci (dorsal); h, hypoproct (dorsal); i, aedeagus (dorsal); j, terminalia (dorsal); k, palpus including palpiger.

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).