Melanagromyza sexseriata , Sasakawa, Mitsuhiro, 2013

Sasakawa, Mitsuhiro, 2013, Thailand Agromyzidae (Diptera) — 2, Zootaxa 3746 (4), pp. 501-528: 516-518

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Melanagromyza sexseriata

sp. nov.

Melanagromyza sexseriata  sp. nov.

( Figs 33–36View FIGURES 30 – 36)

Type material. Holotype male (QBSG), Phetchabun, Nam Nao National Park, 16 ˚ 44.999 ´N, 101 ˚ 27.804 ´E, 715 m a.s.l., 31 vii – 7 viii 2006, Malaise trap, Noopean Hongyothi. Paratype: ♂, Chaiyaphum, Pa Hin Ngam National Park, 15 ˚ 34.802 ´N, 101 ˚ 25.990 ´E, 430 m a.s.l., 16–22 xi 2006, Malaise trap, Katae Sa-nog & Buakaw Adnafai.

Diagnosis. Black; mesoscutum and abdomen strongly shining reddish-coppery; calypter with fringe whitish, halter with stalk brownish yellow, knob dark brown; acr in 10–12 dense rows; surstylus with about 15 spines in two basal rows and about 30 spines in four marginal rows; basiphallus short, distiphallus slender.

Description. MALE. Black; ocellar triangle shining; parafrontalia weakly shining; lunule gray pruinose; arista brownish black; thorax and abdomen strongly shining reddish-coppery (with greenish tinge at places under different angles). Wing with veins yellow at bases; calypter yellow, with fringe yellowish white; halter with knob dark brown but stalk brownish yellow.

Frons 1.5 times as wide as eye, slightly converging ventrally; parafrontalia slightly projecting above eye in profile; ors and ori each two; oh reclinate, in a row but two rows below level of first ori; ocellar triangle with ventral tip extending to level of second ors; lunule semicircular; eye 1.3 times as high as wide, bare; gena 1 / 7 as high as eye. First antennal flagellomere rounded apically, wider than long and wider than genal height, minutely pilose; arista slightly longer than eye height, minutely pubescent.

Mesoscutum with 0+ 2 dc, 10–12 rows of acr. Wing 2.6 mm long; costa extending to M 1, with three sections in proportion of 31–34: 10: 9; r-m at middle level of discal cell (11: 10); M 1 ratio 2.7–2.9; ultimate section of CuA 1 about 2 / 3 (11–12: 18) as long as penultimate section. Mid tibia with two strong pd.

Epandrium with surstylus projected narrowly, bearing spines in two groups: 14 or 15 spines in two dorsobasal rows and 29–32 spines in four irregular rows along ventral margin of projection; cercus slightly shorter than epandrial height. Hypandrium 480 µm long, with sidearms fused broadly on basal 1 / 4, apodeme short (1 / 12 length of sidearm). Phallapodeme 680 µm long; phalluic hood 200 µm long, subquadrate, shorter than wide, with serration of three teeth on lateral side before distal corner. Phallus 440 µm long; basiphallus short, distiphallus narrow as figured, with distal tube almost membranous; ejaculatory apodeme 220 µm long, 90 µm wide.

Body length 2.7 mm.

FEMALE. Unknown.

Distribution. Thailand.

Remarks. This species is similar to Melanagromyza dolichostigma  in having a strongly shining-coppery body and a bare eye, but is distinguished from the latter by its larger size, paler stalk of halter, minutely pubescent arista, broader frons and gena, denser rows of acr, denser spines on the surstylus, and thin distiphallus. Also, this species has a characteristic arrangement of spines on the surstylus as seen in Papua New Guinean Melanagromyza bispinosa Sasakawa  (1963 c, fig. 7 a), but in M. sexseriata  , the body is reddish-black, the eye is bare, the rows of acr are denser, and structure of the distiphallus is more complicated.

Etymology. The specific name refers to the six rows (Latin: sex + series)of spines on the surstylus.