Bibio baumbergeri Théobald, 1937

Skartveit, John & Nel, André, 2017, Revision of fossil Bibionidae (Insecta: Diptera) from French Oligocene deposits, Zootaxa 4225 (1), pp. 1-83 : 61

Bibio baumbergeri Théobald, 1937

(Figs. 51 – 52, 165 – 171)

Bibio baumbergeri Théobald, 1937: 223 .

Bibio parenti Théobald, 1937: 224 . Syn.n.

Bibio bayleyi Brongniart, 1879 (date taken from specimen label), presumably an unpublished cabinet name in collection of EM

Material examined. Holotype (female) of Bibio baumbergeri NMB F456. Paratype (female) of Bibio baumbergeri NMB. Holotype (female) of Bibio parenti NMB F1372. Female (EM 70001, stored at FSL), labeled “ Bibio Bayleyi ”.

Additional material—4 males NMB F1377/4, F1377/6, F2183, F2258; 7 females: NMB F1376/1-2, F1377/2-3, F1377/5, F454, F 2330. 8 females, Aix-en-Provence, Coll. Coquand, EM 70207 (A 10.3), 70208 (A 10.6), 70209 (A 10.44), 70210 (301 λ), 70211-70214.

Localities. Kleinkembs, Aix-en-Provence.

Diagnosis. A medium-sized to large (8.3 – 13 mm), robust Bibio . Antennal flagellum 7-segmented. Wing hyaline to yellowish fumose with concolourous veins, pterostigma indistinctive, crossvein R-M about one third as long as basal Rs. Legs yellowish-brown in female, black in male, protibial spur about half as long as anterior spine.

Redescription. Male: Total length 8.3 – 10.3 mm (N=4).

Head: Black. Ocellar triangle low and inconspicuous.

Thorax: Length 2.7 – 2.9 mm (N=3), width 2.3 mm (N=1). Black, haltere pale yellowish.

Wing (fig. 165): Length 6.8 mm, width 2.8 mm (N=1). Hyaline, R-veins brown, fine, posterior veins colourless. Basal section of R4+5 about three times as long as R-M. Wing vein measurements in Table 4 .

Legs: Black. Fore femur 2.0 – 2.3 mm long, 0.7 mm wide (N=2). Hind femur stout, clavate, hind tibia slender. Length of hind femur 2.4 – 3.5 mm, width 0.5 – 0.6 mm (N=3), length of hind tibia 2.2 – 2.9 mm (N=2).

Abdomen: Black.

Terminalia (fig. 171): Not well preserved in any of the specimens at hand. Epandrium bilobate with wide, Ushaped cleft between lobes.

Female: Total length 9.3 – 13.0 mm (N=9).

Head (fig. 167): Length 1.2 – 1.6 mm (N=4), width 1.1 – 1.2 mm (N=2), longer than broad, nearly rectangular. Compound eye small and prominent. Ocellar tubercle rather small. Antenna rather small.

Thorax: Length 2.7 – 4.0 mm (N=8), width 2.7 mm (N=1). Black.

Wing (fig. 166): Length 8.0 – 10.7 mm (N=8), width 3.1 – 3.7 mm (N=6). Yellowish fumose, R-veins yellowish, posterior veins colourless. Subcosta rather short, apically indistinctive. Costa extends to apex of R4+5.Pterostigma indistinctive. Basal radial sector about three times as long as R-M. Wing vein measurements in Table 4 .

Legs (figs. 168–169): Yellowish brown to dark brown. Fore femur length 1.9 – 2.6 mm (N=6), width 0.71 – 0.91 mm (N=6). Fore tibia length 2.1 – 2.2 mm (N=2), width 0.41 – 0.56 mm (N=2), with spine approximately twice as long as spur. Hind femur length 2.4 – 4.5 mm (N=10), width 0.46 – 0.71 mm (N=10), clavate, hind tibia length 2.2 – 4.2 mm (N=7), slender, tarsi slender.

Abdomen: Brown, cylindrical.

Terminalia (fig. 170): Cerci short, curved and pointed.