Bibionidae
Creators: name: Skartveit, John
name: Krizmanić, Katarina
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Bibionidae

description: Key to the fossil Bibionidae from Radoboj
(females except for Penthetria cimicoides, Penthetria gracilis and Penthetria longa). Species described from other localities which have unconfirmed records from Radoboj are included.
1 Radial sector furcate, distally divided with veins R 2+3 and R 4+5. Crossvein R-M vertical. Legs slender................... 2
- Radial sector undivided. Crossvein R-M oblique. Legs more or less thickened (Bibioninae)......................... 10
2 Vein R 2+3 long, more or less horizontal. (Genus Penthetria).................................................... 3
- Vein R 2+3 short, oblique to vertical. (Genus Plecia)........................................................... 7
3 Wing wider, length/width = 2.6–2.7....................................................................... 4
- Wing narrower, length/width ≈ 3.0........................................................................ 5
4 Wing apically broadly rounded, R 2+3 very long and horizontal.................................. Penthetria cimicoides
- Wing apically more pointed, R 2+3 shorter and more oblique...................................... Penthetria gracilis
5 Body and legs reddish brown...............................................................? Penthetria longa
- Body and legs coal-black............................................................................... 6
6 R 2+3 longer, straight, wing apically more rounded........................................... Penthetria anthracina
- R 2+3 shorter, distinctively curved, wing apically pointed...................................... Penthetria murchisonii
7 Very large species, body length ≈ 15 mm .......................................................... Plecia morio
- Smaller species, body length 12 mm or less................................................................. 8
8 R 2+3 basally distinctively curved. Femorae mainly pale............................................ Plecia bucklandi
- R 2+3 almost straight, legs entirely dark..................................................................... 9
9 Vein CuA 2 distally distinctively curved basad.................................................... Plecia lugubris
- Vein CuA 2 distally nearly straight............................................................ Plecia lygaeoides
10 Fore tibia cylindrical, with spines mesally. Thorax anteriorly with two transverse spine rows. Body ochreous-brown with dark head................................................................................... Dilophus pinguis
- Fore tibia spindle-shaped with apical spine. Thorax without spines. Body dark. (genus Bibio)........................ 11
11 Wing with radial area black, contrasting against the rest of wing. Very large species,> 15 mm ............ Bibio giganteus
- Radial area of wing not darkened. Often markedly smaller species............................................. 12
12 Wing with Radial sector less than twice as long as R-M.............................................. Bibio firmus
- Wing with Radial sector at least twice as long as crossvein R-M............................................... 13
13 Wing hyaline with dark veins and highly distinctive, dark pterostigma. Vein M 2 distinctively bent at junction with crossvein M-CuA................................................................................ Bibio crassinervis
- Wing veins apparently concolourous with membrane, pterostigma indistinctive. Vein M 2 straight at junction with crossvein M- CuA................................................................................... Bibio enterodelus
description: Published as part of Skartveit, John & Krizmanić, Katarina, 2020, Revision of fossil Bibionidae (Insecta: Diptera) from the Miocene of Radoboj, Croatia, pp. 351-378 in Zootaxa 4759 (3) on page 352, DOI: 10.11646/zootaxa.4759.3.3, http://zenodo.org/record/3741178