Rosapha obscurata

Kovac, Damir & Rozkošný, Rudolf, 2012, A revision of the genus Rosapha Walker (Diptera: Stratiomyidae), Zootaxa 3333, pp. 1-23: 13-14

publication ID 10.5281/zenodo.210456

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scientific name

Rosapha obscurata


Rosapha obscurata  de Meijere

( Figs 36, 40–41, 43View FIGURES 33 – 46, 67 –69View FIGURES 63 – 70, 80View FIGURE 80)

Rosapha obscurata  de Meijere, 1916: 72 Diagnosis. Last flagellomere flattened, band-shaped, ocellar triangle shifted toward middle of frons in both sexes. Scutum and scutellum black, only posterior margin of scutellum and spines yellow. Wing almost completely hyaline, stigma yellow. Legs entirely yellow, abdomen unusually short, almost round to short clavate, black.

Description. Male ( Figs 36, 40, 43 –46View FIGURES 33 – 46, 67– 69View FIGURES 63 – 70). Length: body 4.3–5.6 mm, wing 4.2–5.6 mm. Head ( Fig. 40View FIGURES 33 – 46) as in other small species but ocellar triangle shifted almost to middle of frons, vertex unusually long, longer than ocellar triangle. Upper frons indistinct, lower frons ( Fig. 36View FIGURES 33 – 46) small, frontal whitish hair patch small but distinct, narrowly fused with facial tomentose stripes. Basal part of antenna reddish yellow, 2 apical flagellomeres black. Apical flagellomere flattened, band-shaped, about 1.5 times as long as rest of antenna. Labellum of proboscis bright yellow.

Thorax black and densely covered with short, appressed, reddish yellow hairs, only pronotum and anterior part of scutum markedly shining ( Figs 67–68View FIGURES 63 – 70). Top of postpronotal callus and narrow upper margin of anepisternum yellow. Scutellum black but its broad posterior margin including slender spines yellow. Pleura black, with appressed dense whitish pilosity, only usual part of anepisternum shining. Wing with brown stronger veins in basal half, yellow stigma and very slightly infuscated cell R 5. Halter yellow, also all legs including coxae and tarsi pale yellow.

Abdomen black, unusually short, almost round to short clavate and relatively convex dorsally. Abdominal pilosity very short, predominantly whitish, but black on disc. Male terminalia ( Figs 43–46View FIGURES 33 – 46): Epandrium markedly narrowed toward apex, proctiger relatively short and cercus widened transversely, with short strong setae along outer margin and with a bunch of spine-like setae on proximal tip ( Fig. 45View FIGURES 33 – 46), genital capsule unusually dilated transversely, medial process absent, gonostylus with distinct submedian inner spine, gonocoxal apodeme unusually long ( Fig. 46View FIGURES 33 – 46), gonostylus slightly spatulate in posterolateral view ( Fig. 44View FIGURES 33 – 46), aedeagal complex short, with proximally dilated aedeagal apodeme ( Fig. 43View FIGURES 33 – 46).

Female ( Fig. 41View FIGURES 33 – 46). Length: body 5.0– 5.8 mm, wing 4.7–5.5 mm. Head ( Fig. 41View FIGURES 33 – 46) broadly dichoptic, almost spherical in lateral view and twice as broad as long in dorsal view, ocellar triangle distinctly shifted to middle of frons, vertex behind it unusually long. Postocular area at upper inner eye angle distinctly broader than length of scape. Frons at narrowest point more than twice as broad as ocellar triangle. Two whitish tomentose spots above antennae transverse, finely separated at middle, reaching eye margin on both sides and continuing as facial stripes along facial eye margins. Frons and postocular area covered with appressed, silverish white pile. Basal antennal segments and thickened basal flagellomeres reddish yellow, last two flagellomeres black, last flagellomere flattened laterally, band-shaped, short pubescent, with very short and fine apical seta, about 1.5 times longer than rest of antenna. Somewhat swollen part of face below antennae sparsely covered with whitish hairs, concave lower part mostly bare and shining black. Labellum of proboscis yellow, small apical segment of palpus black. Postgena with long and erect white hairs. Thorax as in male but shining black, anterior part of scutum narrow and thoracic pile likewise appressed but longer and paler. Yellow posterior margin of scutellum somewhat broader and cell r 5 on wing virtually hyaline. Legs completely yellow as in male. Abdomen also short and almost round.

Variation. No variation except differences between sexes was recorded.

Remarks. The male is described here for the first time.

Material examined. Type material: The female holotype is deposited in ZMAN and labelled: "/ Rosapha obscurata  de Meijere, 1916, ZMAN Type DIPT. 0 928.1 [red label]/, / Rosapha obscurata  , det. de Meijere, Type /, / Edw. Jacobson, Fort de Kock [=Bukittingi], Sum. [=Sumatra], 10. 1913 [= X. 1913]?/, / 5659 /".

Other material: Indonesia: Sumatra, Bah Lias, 19. xi.1919, 1 Ƥ, J. B. Corporaal; Sumatra, Fort de Kock [=Bukittingi], 920 m, 1926, 1 Ƥ, E. Jacobson; both in ZMAN. Philippines: Mindanao: Sulu, Jolo I., Talipao, 15–30 m, 31. viii.1958, 1 3, H. E. Milliron, in BPBM. Thailand: Mae Hong Son, Pangmapha, Ban Nam Rin, larvae collected on 06.xi. 2008 under bark of fallen tree, emerged on 08.iv. 2009 [Alk 7, Probe 1], 2 3, leg. D. Kovac; Mae Hong Son, Pangmapha, Ban Nam Rin, larva collected on 06.xi. 2008 under bark of fallen tree, emerged on 16.v. 2009 [Alk 26, Probe 1], 1 Ƥ, leg. D. Kovac; Mae Hong Son, Pangmapha, Ban Nam Rin, larva collected on 06.xi. 2008 under bark of fallen tree, emerged on 2009 [Alk 33, Probe 1], 1 Ƥ, leg. D. Kovac; Mae Hong Son, Pangmapha, near Pai Viewpoint [Kiew Lom], sweeping along stream, 8. iv.2010, 1 3, D. Kovac, all in SMF.

Distribution. Indonesia (Sumatra), Philippines (Mindanao) and North Thailand ( Fig. 80View FIGURE 80).

Habitat. Larvae of R. obscurata  were found under bark of a fallen, rotting tree stem (our observations).


Instituut voor Taxonomische Zoologie, Zoologisch Museum


Bishop Museum


Forschungsinstitut und Natur-Museum Senckenberg