Neosilba plana, 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 : 365

Neosilba plana sp. nov.

( Figs. 1 A-E)

Type data: Holotype ♂. COLOMBIA, Tolima, Ibagué. 04°27’215”N, 75°13’271”O, 1259 m, 30.VIII.2006, M. R. Castañeda & A. Osorio. In Guamo ( Inga ) ( Inga edulis Mart ) ( MEN-UT).

Etymology: The name is an adjective that means flat (from Latin planus = flat) in reference to the flat ventral side of the filament of the aedeagus.

Diagnosis: Neosilba plana could be recognized by the 4 anterior setulae to basal scutellar bristle; circular male terminalia in ventral view and hemispherical in lateral view ( Figs. 1A, B ); margin of the epandrium beyond the surstylus and without lobe ( Fig. 1B ); the filament of the aedeagus with flat lateral and ventral side ( Figs. 1A, C ); the lateral sides thinner from the section C to apex and they are 3 times wider than ventral side; ventral side slight wider in the middle; big cerci; the distal margin of surstylus in ventral view, with a pair of circular-shape invaginations; surstylus with 4 transversal prensisetae at each side ( Fig. 1C ). The hemispherical shape of the male terminalia in lateral view with the filament of the aedagus more or less same width in ventral view, finishing beyond the base of cerci and the big cerci are the common characters of the major group. The new species is similar to species in that group and to N. parva . In other species of the major group the aedeagus is rounded; N. fuscipennis has scutellum without setulae before anterior bristle, surstylus with 6-7 prensisetae at each side, apex of paramere rounded, aedeagus rounded in lateral view and reaching beyond the base of the cerci. N. major differs by scutellum having 1-3 anterior scutellar setulae to basal bristle, surstylus with 10 prensisetae, aedeagus tubular shaped reaching beyond the base of the cerci. N. dimidiata differs by the surstylus projected beyond margin of epandrium, with an anterior lobe and filament of the aedeagus extended beyond apex of cerci. N. longicerata differs especially by the length of the aedeagus, well beyond the apex of the cerci. N. parva differs by 1 anterior scutellar setula to basal bristle, 5-6 prensisetae arranged in curved row and filament of the aedeagus chalice-shaped. N. tolimensis differs by the aedeagus rounded and spiculated at the junction with the C-shape part.

Description: Body length 5.77 mm long 1.77 mm wide at the pteropleura. Head: 2.03 mm wide, 1.86 mm high, 0.78 mm long; front 0.46 mm wide in the lunule, 0.538 mm wide lower ocelar triangle; lunule with 10 setulae; postpedicel 1.0 mm long, 0.205 mm wide in lateral view; arista 1.12 mm long, the medial setulae longer than other, 0.089 mm long; subvibrissal area with 4 setulae. Thorax: 1.77 mm wide at pteropleura, 1.78 mm long; anepisternum with 4 anterodorsal and 5 posterior bristles; scutellum with 12 setulae between lateral bristles and 4 before the anterior bristle; fringes of calypteres with 12 brown setae; Wing: 5.92 mm long, 2.37 mm wide, hyaline. Abdomen: 2.40 mm long. Male terminalia: 0.897 mm long, 0.641 mm wide; epandrium 0.46 mm long, 0.32 mm wide (1.44 times as long as broad); gonopodite long with rolled up margins; paramere isoscelestriangular shape in ventral view, 0.153 mm high, 0.038 mm base; surstylus with 4 acute prensisetae at each side, the more internal one separated from the other three; distal line of surstylus slightly concave in the external half; surstylus with an aedeagus-support medial groove; cerci 0.304 mm long, 0.256 mm wide; filament 0.346 mm long, 0.064 mm widest, external surface plain, thinner from the “C” section in lateral view but slightly medial wider in ventral view, plain lateral and ventral sides; scraper-like ejaculatory apodeme chitinized area of the ejaculatory apodeme 0.25 mm long 0.089 mm wide.

Host: specimens studied were collected from Inga fruits ( Inga edulis Mart ).

Figures

FIGURE 1: Neosilba plana sp. nov. Male genitalia: A. Ventral view; B. Lateral view; C. Distolateral view, details of ventral side of the filament and prensisetae; D. Paramere and basal part of the filament; E. Ejaculatory apodeme.