Japanagromyza nesiota, Lonsdale, Owen, 2013

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

Japanagromyza nesiota sp. n.

Figs 22–24

Description. Wing length 1.5mm (♂). Female unknown. Length of ultimate section of vein CuA1 divided by penultimate section: 0.7; vein r-m before midpoint of cell dm. Eye height divided by gena height 7.0. Lunule with silvery pubescence. Face with slight medial carina.

Chaetotaxy: Prescutellar acrostichal seta approximately 2/5 length posterior dorsocentral. Acrostichal setulae in 8 rows. Intra post-alar small. Fore tibia with medial seta. Mid femur with 1 long, curved posterodistal seta. Katepisternum with one smaller additional seta.

Colouration: Setae dark brown, setulae brown. Halter entirely yellow. Calypter margin and hairs light brown. Body colour brown.

Genitalia: Halves of subepandrial sclerite broadly joined medially, with one pair of anterodorsal lobes and one pair of lateromedial setae. Surstylus very thin, fused to epandrium and with two apical setae. Posteroventral margin of epandrium extended into thin process with single inner-apical tubercle-like seta. Hypandrium elongate and narrow with short apical apodeme. Basiphallus with small dorsobasal sclerite and subrectangular left lateral plate that narrows basally. Hypophallus thin, sclerotized, hooked, and held away from remainder of phallus by membranous folds reinforced by several ill-defined and lightly sclerotized bands. Fused mesophallus + distiphallus forming a clear, thin tubule slightly longer than basiphallus with apex recurved and ending in a broad membranous fold.

Host. Unknown.

Distribution. Seychelles (Aldabra Atoll).

Etymology. The specific name is derived from the Latin for “islander” [nesiote].

Material examined. SEYCHELLES. Aldabra: South Island, Cinq Cases, 3–16.i.1968, B. Cogan & A. Hutson (1♂, BMNH).

Comments. The male terminalia of Japanagromyza nesiota and J. salicifolii are relatively similar, exhibiting a long, narrow surstylus ( Fig. 22 ), a left lateral sclerotization on the basiphallus, a long, dark, rod-like hypophallus ( Fig. 24 ), and a clear, flagellate and fused meso/distiphallus. The external terminalia of J. nesiota are far less tuberculate, however, the epandrium is strongly produced ventrally, and the hypophallus is hooked. Furthermore, J. salicifolii only occurs in temperate north Africa on Salicaceae and is recognizable by an entirely white calypter and bluish colouration.

Figures

FIGURES 22 – 24. Japanagromyza nesiota sp. n., male genitalia; 22: external genitalia, ventrolateral; 23: hypandrium, ventral; 24: phallus, left lateral. Figs 25 – 27: J. salicifolii (Collin), male genitalia: 25: ejaculatory apodeme; 26: genitalia excluding phallus, ventral; 27: phallus, left lateral.