Microdon ifanadiana Reemer

Reemer, Menno & Bot, Sander, 2015, Six new species of Microdon Meigen from Madagascar (Diptera: Syrphidae), Zootaxa 4034 (1), pp. 127-147 : 133-136

Microdon ifanadiana Reemer sp. n.

( Figs 18–25 )

Diagnosis. A moderately elongate species with yellow face, partly yellowish pleuron, and blackish abdomen without fasciae of golden pile. Smaller (11 mm) and more compactly built than the similarly coloured, larger (13– 14 mm) and more elongate M. sava .

Type material. HOLOTYPE. Adult male. MADAGASCAR. Label 1: " MADAGASCAR: Fitovavy / Fitovinany Region, Ifanadiana / District, 12 km W of Ranomafana / 21°15.05'S, 47°24.43'E, alt. / 1127 m, 2- 16.xii.2006. ex: Malaise / trap, coll: M. Irwin, R. Harin'Hala, / MG-09B-167". Coll. CAS. PARATYPE. Adult female. MADAGASCAR. Label 1: " MADAGASCAR: Fitovavy / Fitovinany Region, Ifanadiana / District, 12 km W of Ranomafana / 21°15.05'S, 47°24.43'E, alt. / 1127 m, 16-23.xii.2006. ex: malaise / trap, coll: M. Irwin, R. Harin'Hala, / MG-09B-167". Coll. CAS.

Description of male holotype. Body size: 11 mm. Head. Face and gena yellow; entirely white pilose; with narrow band of whitish pollinosity along eye margins. Oral margin slightly produced. Frons and vertex yellow, except black median spot on frons and brownish ocellar triangle; white pilose, except anterolateral parts of frons and ocellar triangle black pilose. Occiput yellow; white pilose and pollinose. Eye almost bare, very sparse and short pile only visible under high magnification. Antennal fossa about as wide as high. Antenna with scape and pedicel reddish, basoflagellomere black. Arista dark brown, about 4/5 of length of basoflagellomere. Thorax. Mesoscutum black, lateral margins dark yellow; with faint bronze and purple metallic hues; white pilose. Postpronotum and postalar callus dark yellow; white pilose. Scutellum semicircular with pair of apical calcars with mutual distance about 1/4 of width of scutellum at base, slightly concave between calcars; apices of calcars clearly converging; reddish brown with faint metallic hues; white pilose. Propleuron bare. Anepisternum with deep sulcus separating anterior from posterior part; white pilose anteriorly and posteriorly, with widely bare part in between; yellow, except dark brown anteroventrally. Anepimeron yellow dorsally; dark brown ventrally; entirely white pilose. Katepisternum yellow dorsally, dark brown ventrally; white pilose on yellow part, otherwise bare. Katepimeron dark brown, bare and shining. Katatergum and anatergum microtrichose. Calypter white and halter yellow. Wing. Yellowish in cells bc, c, sc and r1, vein R1 yellow; yellowish brown around veins at apical half. Microtrichose, except bare on cell bc, on cell br (only microtrichose along vena spuria and in apical part), posterobasal 1/2 of cell bm, anterobasal 1/3 of cell cup, along A 2 in anal lobe and centre of alula. Legs. Femora black except narrowly dark red at apex; white pilose. Tibiae yellowish red; white pilose. Tarsi dark red to orange; white pilose. Coxae black; white pilose. Trochanters black wit narrow dark red apex; white pilose. Abdomen. Tergite 1 black; white pilose. Tergite 2 black, except lateral margins narrowly yellowish red; white pilose. Tergite 3 dull black medially, shining black laterally, but lateral margin narrowly yellowish red; short black pilose, except longer white pilose along lateral and posterior margins. Tergite 4 mostly dark reddish brown, but blackish laterally except narrow part along lateral margin and posterior margin more widely yellowish red; short dark pilose, except long white pilose along lateral and posterior margins. Sternites blackish brown, except narrowly yellowish along posterior margins; white pilose (incl. sternite 1). Male genitalia as in Fig. 23 .

Female. Body size: 11 mm. As male, except for usual sexual dimorphism and following differences. Tergite 4 with medially interrupted fascia of short golden pile along posterior margin. Tergite 5 dark reddish brown; dark pilose, except white pilose along lateral margins and with large posteromedian patch of golden pile.

Etymology. This species is named after the district Ifanadiana , in which the species was found. The epithet is a noun in apposition.

Figures

FIGURES 18 – 23. Microdon ifanadiana Reemer sp. n. Male holotype. 18. Habitus dorsal. 19. Habitus lateral. 20. Head frontal. 21. Head lateral. 22. Tergites 3 – 4. 23. Genitalia lateral.

FIGURES 24 – 25. Microdon ifanadiana Reemer sp. n. Female paratype. 24. Habitus lateral. 25. Head frontal.