Bibio sp.

NEL, ANDRÉ & KUNDURA, JEAN-PAUL, 2023, The oldest Bibio Geoffroy, 1762 (Diptera: Bibionidae) from the Paleocene of Menat (France), Palaeoentomology 6 (3), pp. 226-229 : 227-228

Bibio sp.

( Fig. 1 )

Material. Specimen MNT Nel 1171 (part and counterpart of an adult fly with apex of abdomen missing), deposited in the “Musée de Paléontologie de Menat”¸ Menat, Puy-de-Dôme, France.

Type locality and horizon. New quarry, Menat , Puy-de-Dôme , France; middle Paleocene, Menat Basin .

Description. Total body length 8.2 mm. Head length 0.9 mm, width 1.1 mm. Palp small, brown. Antenna very short, 0.7 mm long, brown, with eight (?) flagellomeres. Ocellar tubercle not very prominent.

Thorax: mesonotum 2.4 mm long, black, with sparse setation poorly preserved; haltere not preserved. Fore tibia with a strong spur and a strong anterior projection, spur almost as long as anterior projection. Protarsus slender. Mid legs not preserved. Hind femur 2.4 mm long, 0.6 mm wide, tibia 1.8 mm long, 0.2 mm wide, tarsus not preserved.

Wing ca. 4.9 mm long, 2.0 mm wide, light brown infuscate, stigma dark brown; visible veins brown, bare, R-veins thickened. C not extending beyond apex of Rs. Rs nearly reaching wing apex, with its basal part 0.4 mm long; R1 ending on C at 3.3 mm of wing base; Rs and M touching in one point. Branches of M, cubital and anal veins extremely faint, hardly visible.

Abdomen brown, narrow, slightly elongate (possibly a male), preserved part 3.9 mm long, 1.3 mm wide. Terminalia not preserved.

Figures

FIGURE 1. Bibio sp., Menat. Specimen MNT Nel 1171. Photographs. A, Part. B, Counterpart. Scale bar = 4 mm.