Neosilba angusta, Galeano-Olaya & Canal, 2012

Galeano-Olaya, Pedro E. & Canal, Nelson A., 2012, New Species Of Neosilba Mcalpine (Diptera: Lonchaeidae) And New Records From Colombia, Papéis Avulsos de Zoologia 52 (31), pp. 361-385 : 374-377

Neosilba angusta sp. nov.

( Figs. 8 A-D)

Type data: Holotype ♂. COLOMBIA, Tolima, Coello. 04°16’550”N, 74°54’166”O, 309 m, 12.IV.2006, M. R. Castañeda & A. Osorio. Ex Cissus sp. ( MEN-UT) . Paratypes 5 ♂, same data ( MEN-UT)

Etymology: The name of the species is an adjective that means, “to make narrow” (from Latin angustus) in reference to the apex of the filament of the aedeagus.

Diagnosis: Neosilba angusta belongs to pendula subgroup. Neosilba angusta has the epandrium less than two times longer than wide ( Fig. 8B ), surstylus with 9 prensisetae at each side ( Fig. 8C ), two of them located medially and separated from the other longitudinally and external 7 prensisetae, aedeagus smooth beyond the base of cerci, the C-shape of the aedeagus with the same width than filament in lateral and ventral view ( Figs. 8A, B, D ), apex of the filament slightly S-shape and slightly narrowed, paramere with a triangular-shape internal lobe with some setulae ( Figs. 8A, D ). N. pendula , N. perezi , N. pseudopendula and N. spiculata differ by the apex of the filament of the aedeagus being swollen; N. nigrocaerulea differs by proximal lobes of the surstylus wide and beyond the epandrium, by the 9 external and longitudinally prensisetae, and by the gonopodite, uniformelly wide; N. laura differs by the small spiculae at base of the filament and 6 prensisetae at each side of the surstylus; N. pantanense differs by the spiculae at the apical third of the filament of the aedeagus and prensisetae at each side of the surstylus; N. cornuphallus and N. turgidiphallus differs by the filament of the aedeagus wider at the middle and number of prensisetae.

Description: Body length 4.74-5.44 mm long, 1.58-1.63 mm wide at pteropleura. Head: 1.26-1.78 mm wide, 1.26-1.67 mm high, 0.59-0.85 mm long; front 0.19-0.22 mm wide at the lunule, 0.18-0.23 mm wide lower ocelar triangle; frontal lunule with 16 setulae; postpedicel 0.7-0.89 mm long, 0.13 mm wide in lateral view; arista 0.64 mm long, setulae 0.04-0.08 mm long; subvibrissal area with 6 setulae. Thorax: 1.48-1.63 mm wide, 1.78-2.00 mm long; anepisternum with 4 anterodorsal and 6 posterior bristles; scutellum with 5 setulae between lateral bristles; fringes of calypteres with 8 brown setae; Wing 4.00- 4.15 mm long, 1.85-2.11 mm wide, hyaline. Abdomen: 2.30-2.63 mm long. Male terminalia: 0.64-0.77 mm long, 0.24-0.27 mm wide; epandrium 0.36-0.38 mm long, 0.18-0.20 mm wide (1.9-2 times as long as wide); surstylus with 9 prensisetae at each side (two of them near of the medial line and 7 in the lateral line), aedeagus long and slender, filament fine, smooth, 0.51-0.58 mm long, 0.03 mm wide, apex slightly S-shape in lateral view and slightly narrowed in ventral view, triangular-shape paramere with some medial setae, gonopodite medially wider and acute at apex, cerci 0.064 -0.071 mm long, 0.072 -0.077 mm wide in ventral view.

Host: N. angusta was collected from fruits of Cissus sp. ( Vitaceae ).

Figures

FIGURE 8: Neosilba angusta sp. nov., Male genitalia: A. Ventral view; B. Lateral view; C. Details of the prensisetae (ventral view of the epandrium); D. Base of the epandrium (lateral view), details of the paramere and gonopodite.