Ornidia therezinhae Carvalho-Filho & Esposito

Filho, Fernando Da Silva Carvalho & Esposito, Maria Cristina, 2009, A review of the flower fly genus Ornidia Lepeletier & Serville (Diptera: Syrphidae) with the description of a new species from Brazil, Zootaxa 2014, pp. 59-64 : 60-62

Ornidia therezinhae Carvalho-Filho & Esposito , n. sp.

( Figs. 1–5 , 8, 10 , 13–16 , 18, 20 )

Male.- Head ( Fig. 1 ): Eye red (in dry specimens) with yellowish pile; black vertical triangle with black pile; frontal triangle shiny, yellow pilose; lunule orange; face shiny, yellow pilose except white pollinose under antenna; gena shiny, yellow pilose; scape, pedicel and basoflagellomere brown; basoflagellomere laterally flattened; arista yellow, with aristal rays yellow; occiput dark, white pilose.

Thorax: Shiny except narrowly grayish-white pollinose anteriorly and covered with short black pile; pleura brown, green metallic, except meron yellow anterior margin, covered with long yellow pile; spiracular fringe yellow; scutellum with a pre-apical median depression ( Fig. 18 ), black pilose; dorsal and ventral calypter black; halter white except stem brownish orange. Wing: yellowish, bare with brown apical spot restricted to area around confluence of R1 and R2+3 and with developed median brown spot that start in apical portion of SC, crossing R1 and R2+3 bifurcation and ending on r-m ( Fig. 20 ); halter whitish. Legs: Fore coxa black with short black pile; mid coxa yellow except brown spot covered with a black pile on anterior surface; hind coxa yellow with long yellow pile except a black pile apically; fore trochanter black, mid and hind yellow; femora dark brown metallic green, black pilose; mid femur yellow basally; tibiae metallic purplish black, shiny, black pilose; tarsi brownish black with black pilosity; tarsal claw with basal portion black and white tip.

Abdomen: shiny except black pollinose on most of 2nd tergum; 1st 2nd and 3rd terga covered with short black pile; 4th and 5th terga with long yellow pile; venter with long yellow pile. Male genitalia: as figures 2–5, 8, 10, 13–16.

Body length (n=3): 1.2–1.4 cm; wing length: 3.7–3.9 cm.

Female: unknown

Geographic distribution: Brazil (Acre).

Etymology: The name of species are dedicated to Therezinha Pimentel (MPEG), who has been working on Amazon Diptera taxonomy and who permitted study of the type material.

Ecology: unknown.

Type material: Holotype 3, BRAZIL, Acre, Rio Branco, 25. X- 08.XI.1991, terra firme forest, Malaise trap, A.Henriques, I. S. Gorayeb & N. Bittencourt leg., deposited in Museu Paraense Emílio Goeldi ( MPEG), Pará. Paratypes: five 3 with same data as Holotype, three deposited in MPEG and two to be deposited in Museu de Zoologia da Universidade de São Paulo ( MZUSP).

Comments. Ornidia therezinhae would be identified in the keys of Val (1972), Thompson (1991) and Morales and Köhler (2004) as Ornidia obesa , as both species show a single depression on the scutellum and apical spot of wing restricted to area around confluence of R1 and R2+3. However, it differs from O. obesa in having the mid and hind coxae yellow, not dark brown and without metallic colouration and having the frontal triangle yellow pilose. O. therezinhae also differ from O. obesa mainly in the shape of male terminalia. The hypandrium of O. obesa shows the superior margin discontinuous and a spine projection (highlighted with a yellow circle in figure 9) near of lateral margin ( Figs. 6 , 9 , and 12). In O. therezinhae the superior margin of hypandrium is rounded with a very short projection placed inside a shallow concavity ( Figs. 4 , 8 , 15 and 16 ). The posterior lateral margin is very different as well, in O. obesa it is discontinuous and shows a conspicuous elongated finger-like projection ( Figs. 6 and 9 ), whereas in O. therezinhae the posterior lateral margin is rounded, with a very short projection ( Figs. 4 , 8 , 13, 14, 16 ).

In addition, the aedeagus shape also is different in both species, in O. obesa the ventral surface shows two lobes, anterior one developed and with about half length of second one ( Fig. 7 ) whereas in O.therezinhae the first lobe is very short and reduced ( Fig. 5 ).

Figures

FIGURES 1 – 7. Ornidia therezinhae sp. n.: 1. Head, lateral view. 2. External genitalia, ventral view. 3. External genitalia, lateral view. 4. Hypandrium, lateral view. 5. Aedeagus, lateral view. O. obesa: 6. Hypandrium, lateral view. 7. Aedeagus, lateral view. Scale bar: 1 = 1.0 mm; 2, 3, 4 and 6 = 0.5 mm; 5 and 7 = 0.1 mm.

FIGURES 8 – 12. 8. Ornidia therezinhae sp. n., hypandrium with aedeagus, lateral view. 9. Ornidia obesa, hypandrium with aedeagus, lateral view. 10. O. therezinhae sp. n., detail of anterior lateral margin of hypandrium showing the site highlighted with a red circle in figure 8. 11. O. obesa, detail of anterior lateral margin of hypandrium showing the site highlighted with a red circle in figure 9. 12. O. obesa, detail of spine highlighted with a yellow circle in figure 9.

FIGURES 13 – 16. Ornidia therezinhae sp. n., hypandrium with aedeagus. 13. Dorsal view. 14. Detail of superior part, dorsal view. 15. Antero-lateral view. 16. Lateral view of antero-superior margin.

FIGURES 17 – 20. 17 – 18. Scutellum, dorsal view. 19 – 20. Apical half of wing.