Revision of fossil Bibionidae (Insecta: Diptera) from the Miocene of Radoboj, Croatia
Author
Skartveit, John
Author
Krizmanić, Katarina
text
Zootaxa
2020
2020-04-03
4759
3
351
378
journal article
10.11646/zootaxa.4759.3.3
9675f3d4-930d-4e4c-97e1-bcc7e6c5120d
1175-5326
3741178
FBD53C14-07AA-4E01-9739-214680A1DE4C
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