Furciseta hyalipennis, Câmara, J. T. & Rafael, J. A., 2013

Câmara, J. T. & Rafael, J. A., 2013, A new species of Furciseta (Diptera, Ctenostylidae) from the Brazilian Amazon, Zootaxa 3669 (2), pp. 147-152 : 148-152

Furciseta hyalipennis n. sp.

( Figs. 1–22 )

Male ( Fig. 1 ). General colouration yellowish brown with legs yellow and thorax spotted yellowish brown. Head: Holoptic, more bulky than thorax ( Figs. 1, 4 ). Frons brown with brown pruinescence, protuberant near antennae ( Figs. 1, 2 ), with brown bifid prominence near protuberance and small yellow lateroinclinate setae ( Fig. 3 ). Ocelli absent ( Fig. 4 ). Vertex with 1 pair of convergent vertical setae ( Fig. 3 ). Postcranium yellow except for brown dorsal sutures, with yellow setae ( Fig. 3 ). Postocular row of setae restricted to ventral half of occiput. Antennal sockets separated by frontal protuberance. Face divergent, yellow, with median sclerotized zone more or less differentiated from lateral zones, without transparent area ( Fig. 2 ). Eye with upper ommatidia slightly larger than lower ommatidia. Antenna yellow ( Figs. 1, 3 ); pedicel with long and distinct anterodorsal setae ( Fig. 3 ); flagellomere 1 narrowed to the apex, with arista inserted near the base, ( Fig. 3 ); arista simple ( Fig. 3 ). Parafacial narrow, setulose. Proboscis greatly reduced and palpus yellow.

Thorax mainly brown, with yellow stripes on mesonotum ( Fig. 4 ) Postpronotal lobe with 3–4 small setae. Mesoscutum with numerous short yellow reclinate setulae; including apparently triseriate acrostichals; and larger setae including 4 uniseriate dorsocentral setae, 1 postalar, 2 postsutural supra-alars, 1 posterior notopleural, 2 pairs scutellars. Notopleuron bare. Proepisternum with 9 setae. Prothoracic spiracle subovate, bare. Posteroventral margin of anepisternum and median part of anepimeron setulose. Legs yellow, except apical half of hind tibia and hind tarsomeres dark brown ( Fig. 1 ). Legs narrow, with small setae.

Wing hyaline with yellow veins ( Figs. 1, 5 ). Humeral vein absent. Costal vein extending to vein M. Vein Sc incomplete. Vein R1 with sparse, weak dorsal setulae. Pterostigma absent. Veins R2+3 and R4+5 strongly divergent. Vein R 2+3 inserted between level of bases of M and CuA2+A1. Crossvein r-m placed just after middle of cell dm. Basal part of vein M short. Vein CuA2+A1 incomplete. Vein A2 very weak present as a fold. Alula present (folded in the figure). Halter with light-yellow stem and dark-brown knob ( Fig. 4 ).

Abdomen ( Fig. 1 ) mainly brown, except tergite 1 and base of tergite 2 yellow, tergites 4 and 5 with paramedian black spots ( Figs. 1, 6 ), sternites 1–3 and 8 yellow. Tergites rather weakly sclerotized ( Fig. 6 ). Sternites apparently less sclerotized than tergites ( Fig. 6 ). Sternites 1 and 2 rather fused; sternite 2 subtrapezoidal; sternites 3 and 4 each consisting of pair of small rounded sclerites; sternite 5 largest, wider than long, subtriangular; sternites 6, 7 and remnants of tergite 7 and 8 (at the right side) subrectangular. All spiracles positioned in the membrane.

Terminalia: Epandrium subglobose ( Fig. 4 ); subepandrial sclerite narrow in ventral view ( Fig. 8 ). Surstylus rather membranous, with small spiniform setae on inner face ( Figs. 8, 9 ). Cercus large, setulose ( Fig. 7 ). Hypandrium weakly sclerotized ( Figs. 9, 11 ). Ejaculatory apodeme longer than phallapodeme ( Figs. 7, 8 ), with translucent base ( Fig. 10 ). Phallapodeme partially fused to base of hypandrium ( Figs. 7, 9, 11 ). Phallus long, curved, bare, narrowed subapically, ribbon-like, rather membranous.

Specimen length: 4.3 mm; wing length: 3.1 mm.

Female ( Fig. 12 ): similar to male, except head dichoptic with dorsal and ventral ommatidia of subequal size ( Figs. 12, 13, 16 ); eye smaller than in male. Frons yellow with brown spots at base of anterior prominence and at apex, near antennae ( Figs. 12, 16 ). Face subrectangular, concave ventrally ( Fig. 14 ). Flagellomere 1 subovate with deep depression in which arista is inserted ( Figs. 15, 16 ). Arista branched with 2 stems ( Figs. 13, 15 ). Wing hyaline, inconspicuously and narrowly infuscate near costal margin ( Fig. 17 ). Tergites 4–6 with paired paramedian black spots ( Figs. 18, 19 ). Terminalia: sternite 2 subrectangular; sternites 3–6 each consisting of pair of small rounded setulose sclerites ( Fig. 19 ). Tergosternite 7 enlarged, rather cylindrical, sclerotized, fused laterally ( Figs. 20 ). Tergosternite 8 and cerci lost.

Specimen length: 4.5 mm; wing length: 2.9 mm.

Geographical records. Brazil (Amazonas and Maranhão).

Material examined. Holotype 3 (pinned): “ BRASIL, Amazonas, Manaus, F.[azenda] P.[orto] Alegre BR 174 Km 68/17–21.i. 1994. F.F. Xavier”, “ Furciseta hyalipennis Holótipo 3” (INPA). Paratypes: “ BRASIL, Amazonas, Manaus, Res[erva] 1113 R.L.O. 24.vii.1986. Bert Klein” (13, INPA). “ BRASIL, Amazonas, Manaus, AM 0 10 Km 31, Embrapa 18.iii.1992. L.P.Alburquerque, J. Bindá” (1 Ƥ, INPA). “ Brasil, MA[ranhão], Mirador, Parque Est[adual] Mirador, Base da Geraldina/luz, 21–25.vi. [20]07. F.L.Limeira col.” (1 3, CZMA).

Holotype condition. Pinned, left wing lost; right wing mounted on a microslide and terminalia were placed in microvial with glycerin and both pinned along with the specimen.

Etymology. From the Latin hyalinus = glassy and pennis = wing, referring to the hyaline wings.

Discussion. Furciseta was characterized by Korneyev (2010) by having vein M absent at the level of cell bm. In the new species, vein M is present basally on cell bm. Furciseta hyalipennis n. sp. can be separated from F. plaumanni (Henning) by the key characters presented above.

Acknowledgements

We thank Dr. Francisco Limeira-de-Oliveira, curator of the Coleção Zoológica do Maranhão (CZMA) for the loan of the specimens; Ms Eileen M. Evans-Nantais for permission to use figure 70.23 from the Manual of Central America Diptera ; Dr. Adrian Plant for helping with English; the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the award of a fellowship to J.A.R. (grant 300305 /2007–9); Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for the Ph.D. scholarship to J.T.C.; the Fundação de Amparo à Pesquisa do Estado do Amazonas, Programa de Apoio a Núcleos de Excelência (Pronex) (FAPEAM, Edital 016/2006, Proc. 1437/2007) and CNPq for financial support (Proc. 472237/2009-8).

Figures

FIGURES 1 – 11. Furciceta hyalipennis n. sp., holotype 3, except Figure 5, paratype 3. 1, habitus, lateral view; 2, head, anterior view; 3, head, lateral view; 4, head, thorax and base of abdomen, dorsal view; 5, wing, lateral view; 6, tergites (T) and sternites (ST); 7, terminalia, lateral view; 8, terminalia, ventral view; 9, surstylus, hypandrium and ejaculatory apodeme, ventral view; 10, phallopodeme, lateral view; 11, ejaculatory apodeme, hypandrium and phallus, lateral view.

FIGURES 12 – 20. Furciceta hyalipennis n. sp., paratype f #. 12, head, dorsal view; 13, head, lateral view; 14, head, ventral view; 15, antennae, lateral view; 16, head and thorax, dorsal view; 17, wing; 18, tergites (T) 1 – 7, dorsal view; 19, tergites (T) 2 – 6, dorsal view and sternites (ST) 1 – 6, ventral view; 20, tergosternite 7 (TGST).

FIGURES 21 – 23. Furciceta plaumanni. 21, wing of male; 22, wing of female; 23, sternite (st) 1 – 8 and terminalia of male, ventral view (copied from Korneyev 2010, with permission from the Manual of Central America Diptera editor, Ms. Eileen M. Evans- Nantais).