Japanagromyza nigrihalterata Spencer,

Lonsdale, Owen, 2013, Japanagromyza Sasakawa (Diptera: Agromyzidae) of Africa, Zootaxa 3709 (5), pp. 445-460: 453-456

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Japanagromyza nigrihalterata Spencer


Japanagromyza nigrihalterata Spencer 

Figs 28–34View FIGURES 28 – 34

Agromyza nigrihalterata Spencer 1959: 246  .

Japanagromyza nigrihalterata  . Spencer 1960: 17.

Description. Wing length 2.2mm (♂), 3.0mm(♀). Length of ultimate section of vein CuA 1 divided by penultimate section: 0.8; vein r-m at or slightly past midpoint of cell dm. Eye height divided by gena height approximately 10.0– 10.5. Lunule semicircular. Face with slight medial carina in male. Clypeus glossy with anterior margin relatively straight.

Chaetotaxy: Prescutellar acrostichal seta 2 / 5 – 3 / 5 length of posterior dorsocentral. Approximately 10 rows of acrostichal setulae; setulae present between anterior and posterior dorsocentrals in male, row bare in female. Female with well developed setula in front of anterior dorsocentral (approximately ¼ length). Intra post-alar setulalike. Katepisternum with two smaller additional setae. Small fore tibial seta present in female. Mid femur without long posterodistal setae.

Colouration: Setae dark brown, setulae with brown tint. Halter black with apical surface white, with sharp, well-defined boundary between both colour regions. Calypter margin white and hairs light brown. Body colour dark brown with nearly indistinct greenish shine in male.

Genitalia: Subepandrial sclerite composed of one pair of large, bare plates joined by narrow dorsomedial bridge. Surstylus short, rounded, entirely fused to epandrium and with anterior margin curved inwards; with circular patch of very short setae on inner face. Cercus tapered on distal 2 / 5, short setose; one pair of weak, floating sclerites in perianal region. Phallophorus short, separate from basiphallus. Basiphallus with large left lateral / dorsal sclerite that is most heavily sclerotized apically; right lateral surface with two smaller floating sclerites, with dorsal-most margin exceeding mesophallus; mesophallus large, bulbous and smooth, subequal in size to distiphallus; apex of ejaculatory duct adjoining mesophallus thickened and sclerotized. Distiphallus with wide ventromedial plate that joins thick, basal C-shaped stem; apex of stem joined to small, bilobed, internally spinulose and thin-walled chamber. Ejaculatory apodeme with well defined stem and basal process; blade clear and subovate with dark medial rib with transverse striations; pileus ejaculatorius broad; base of stem and pileus extending along base of duct.

Host. Unknown.

Distribution. Kenya, Rwanda.

Holotype. KENYA. Meru, vii. 1943, van Someren (1 ♀, BMNH).

Additional material examined: KENYA. Nairobi, 5500ft., 9–13.xii. 1970, A.E. Stubbs, B.M. 1972 - 211 (1 ♂, BMNH).

Comments. Males were previously unknown for Japanagromyza nigrihalterata  . The male genitalia are figured here for the first time, although the phallus was unfortunately misplaced following illustration.