Lamprempis triangulata, Câmara, J. T. & Rafael, J. A., 2013

Câmara, J. T. & Rafael, J. A., 2013, Lamprempis Wheeler & Melander (Diptera, Empididae, Empidinae) from Maranhão, Brazil, Zootaxa 3613 (3), pp. 274-280 : 277-279

Lamprempis triangulata sp. nov.

( Figs. 11–22 )

Diagnosis. Hind tibia with ventral subtriangular projection at basal third. Cercus fused dorsally, projected posteroventrally. Hypoproct comma-shaped from posterior view, and with long setae at apex. Phallus coiled on distal half.

Description. Holotype male ( Fig. 11 ). Head holoptic with very small triangular frons above antennae; upper ommatidia larger. Ocellar tubercle protuberant, black, with grey pruinescence, two pairs of divergent setae, anterior setae longer. Ocelli reddish. Face parallel-sided, height about 2.5X upper width, black, with grey pruinescence. Postocular setae black, distinct, arranged in incomplete uniseriate row. Postcranium black, with grey pruinescence. Postgena with long black setae. Antenna inserted above middle of head; scape and pedicel brown, with black setae; scape about 5X longer than pedicel; postpedicel black, about 3X longer than pedicel; stylus black, about 0.8X length of postpedicel. Proboscis longer than head height, dark brown to black, and black setaceous, setae longer on labellum.

Thorax ( Fig. 11 ) black and shiny, except brown on pronotum, postpronotal lobe, supra-alar area, postalar lobe, anepisternum, katepisternum and laterotergite, with grey pruinescence, more conspicuous laterally and posteriorly to transverse suture on scutum, and on scutellum, subscutellum, anespisternum and katepisternum. Pronotum with transverse row of black setae on anterior margin. Mesothoracic and metathoracic chaetotaxy: 1 acrostichal uniseriate row, slender and short, except for 2 stouter posterior prescutellar setae; dorsocentrals biseriate, slender, short and black until just posterior to transverse suture, remaining 4 posterior setae longer; 2–5 postpronotals; 2 robust notopleurals with several smaller anteriorly; several supra-alars, 2 stronger posteriors; 2 postalars, posterior setae stouter; 5 pairs of divergent scutellar setae; laterotergite with more than 20 long black setae.

Legs ( Fig. 11 ) brown, except fore femur with distal three-quarters, hind femur with distal quarter and hind tibia yellow, hind femur with medial half and apex with dark brown to black ring and tarsomeres of all legs dark brown to black. All legs with long and distinct setae; mid and hind legs with anterodorsal and posterodorsal rows of long setae; hind femur with anteroventral spiniform setae on distal two-fifths ( Fig. 13 ); hind tibia with ventral subtriangular projection on basal third ( Fig. 13 ).

Wing ( Fig. 12 ) hyaline with brown costal cell; radial fork V-shaped; M1 and M2 evanescent distally, latter slightly curved posteriorly. Halter with light brown stem and brown knob.

Abdomen ( Figs. 11, 14 ) black with green-blue metallic reflections. All segments with black setae, longer setae mainly on segments 1 and 2. Sternite 7 subtrapezoidal ( Fig. 15 ). Tergite 8 narrow ( Figs. 14, 15 ). Sternite 8 larger than sternite 7 ( Fig. 15 ).

Terminalia (paratype) with wide epandrium possessing elongate ventral projection with rounded apex and long setae ( Figs. 14, 18 ). Cerci fused dorsally ( Fig. 16 ), with apex ventrally projected ( Figs. 14, 18 ). Hypandrium shorter than phallus, longer than wide, with rounded posterior margin enclosing phallus; with long medial setae ( Figs. 17, 21, 22 ). Subepandrial sclerite shorter than bacilliform sclerite ( Fig. 19 ). Hypoproct comma-shaped, in posterior view, with long setae at apex ( Fig. 20 ). Ejaculatory apodeme tetralamellar with anterior portion pale ( Figs. 16, 17, 21 ).

Specimen length: 6.5 mm; wing length: 4.7 mm.

Female. Unknown.

Material examined. HOLOTYPE 3. “ BRASIL, MA[ranhão], C[entro] N[ovo] Maranhão, REBIO—Res[erva] Biol[ógica] Gurupi, 0 3 ° 14'05''S / 46 ° 41'83''W ” “Arm[adilha] Luminosa Móvel, 07–15.i.2011. F. Limeira-de-Oliveira & M. M. Abreu, cols” (CZMA). PARATYPES: same as holotype (2 3 CZMA, 2 3 INPA).

Holotype condition. Pinned, right wing on microslide, not dissected.

Etymology. From Latin (triangular = triangle) and refers to the ventral subtriangular projection on the hind tibia.

Discussion. Lamprempis triangulata sp. nov. differs from all other known species by the ventral subtriangular projection on the basal third of the hind tibia and by the distinctive terminalia, specifically the comma-shaped hypoproct, when seen in posterior view, with long setae apically, and the phallus longer than the hypandrium, tightly twisted on the distal half, and wider medially.

Lamprempis triangulata runs to couplet 11, option 11’, as L. bezzii Smith, 1962 , in Smith’s (1975) key. Lamprempis triangulata differs by possessing uniseriate acrostichals with slender and short setae, except for 2 stouter prescutellar setae and between posteromost and stouter dorsocentrals (absent in L. bezzii ), 5 pairs of divergent scutellar setae (4 marginal setae in L. bezzii ), hind tibia with ventral subtriangular projection on basal third (absent in L. bezzii ) and terminalia ( Figs. 14, 18 ) entirely different from figure 57 in Smith (1962).

Variation. Male specimens with body length varying from 6.3 to 6.8 mm.

Males of the new species can be identified based on the following modified couplets from the key to species in Smith (1975).

10 Hind trochanter grotesquely enlarged and modified (Smith 1975, fig. 2)...................... L. sazimae Smith ( Brazil) - Hind trochanter not so modified........................................................................ 11 11 Third antennal segment narrow, with a very short stylus.................................. L. gemmae Bezzi ( Bolivia) - Third antennal segment broader, with stylus of almost equal length............................................ 11b 11b Hind tibia with ventral subtriangular projection ( Fig. 13 ).............................. L. triangulata sp. nov. ( Brazil) - Hind tibia without projection.......................................................... L. bezzii Smith ( Brazil) 17 Smaller (2.5 mm) blue-green species................................................. L. suavis (Loew) ( Mexico) - Larger (3.5mm) coppery-black species.................................................................. 17b 17b. Tibia black. Scutellum with 3 pairs of setae. Sternite 4 without projection.................. L. furcaticauda Smith ( Brazil) - Tibia brownish. Scutellum with 1 pair of setae. Sternite 4 with comma-shaped projection ( Figs. 4, 5 )....................

............................................................................ L. longipenis sp. nov. ( Brazil)

Figures

FIGURES 11 – 22. Lamprempis triangulata sp. nov. 11 – 13. Holotype 3. 11, habitus, lateral view; 12, wing; 13, hind femur, tibia and tarsomeres 1 – 2, anterolateral view; 14 – 22. Paratype 3. 14, distal part of abdomen and terminalia, lateral view; 15, sternites 3 – 8, ventral view; tergites 4 – 7, dorsal view; 16, terminalia, dorsal view; 17, terminalia, ventral view; 18, cercus, subepandrial sclerite and epandrium, lateral view; 19, subepandrial sclerite and bacilliform sclerite, dorsal view; 20, hypoproct, posterior view; 21, ejaculatory apodeme, hypandrium and phallus, lateral view; 22, hypandrium, ventral view.

FIGURES 1 – 10. Lamprempis longipenis sp. nov. holotype 3, except Figure 3, paratype 3. 1, habitus, lateral view; 2, wing; 3, antennae, lateral view; 4, distal part of abdomen, lateral view; 5, sternites 3 – 7, ventral view; 6, tergite 8, dorsal view and sternite 8, ventral view; 7, terminalia, lateral view; 8, subepandrial sclerite and cercus, dorsal view; 9, terminalia, ventral view; 10, phallus, ejaculatory apodeme, gonocoxal apodeme and hypandrium, lateral view.