Plecia Wiedemann, 1828

Skartveit, John & Nel, André, 2017, Revision of fossil Bibionidae (Insecta: Diptera) from French Oligocene deposits, Zootaxa 4225 (1), pp. 1-83 : 36-38

publication ID

https://doi.org/ 10.5281/zenodo.259087

publication LSID

lsid:zoobank.org:pub:4676EE59-569B-4197-B108-9B32FD88E68E

DOI

https://doi.org/10.5281/zenodo.6039617

persistent identifier

https://treatment.plazi.org/id/03A9879C-FFDD-F419-45D3-30267F8D39A6

treatment provided by

Plazi

scientific name

Plecia Wiedemann, 1828
status

 

Genus Plecia Wiedemann, 1828 View in CoL

In the 19th Century, fossil Plecia species were mostly placed in the genus Protomyia Heer , though many Penthetria species were also included in this genus.

Plecia assonensis Gentilini, 1993 View in CoL ( Figs. 19, 107 – 109 View FIGURES 107 – 109 )

Plecia assonensis Gentilini 1993: 161 View in CoL .

Possibly a synonym of Plecia livida , but the pointed gonostylus might be diagnostic together with the straight, oblique vein R2+3 and the indistinctive pterostigma.

Material examined. (RGL) Dauphin 33, Bois d’Asson 34, Bois d’Asson 81

Localities. Bois d’Asson

Diagnosis. A small Plecia (wing length approximately 5 mm). Antennal flagellum 9-segmented. Vein R2+3 straight and oblique. Male gonostylus stout digitiform.

Redescription. Male: Total length 5.0– 8.5 mm (N=2, the former specimen obviously shrunk)

Head: Length 0.81 mm (N=1), width 0.86 – 1.21 mm (N=2). Antennal flagellum 9-segmented according to Gentilini (1993: 161), not possible to see in the specimens at hand.

Thorax: Length 1.7 – 2.9 mm (N=3), width 1.7 – 2.2 mm (N=2). Brown. Haltere pale.

Wing (fig. 107): Length 5.1 – 5.7 mm (N=3), width 1.7 – 2.5 mm (N=2), length/width = 2.31 – 3.01 (N=2). Pale brownish, almost hyaline, veins brown, slender, R-veins not notably stronger than posterior veins. Costa extends to a little beyond apex of R4+5. Subcosta fine, terminates approximately at fork of M, humeral vein present. Vein R 2+3 short, nearly straight and oblique, R4+5 slightly curved. Pterostigma small, light brown, indistinctive. Wing vein measurements in Table 2.

Legs: Light brownish, getting darker apicad. Hind femur apparently pale with darker apex.

Abdomen: Length 2.9 – 5.8 mm (N=3), width 0.9 – 1.4 mm (N=3). Brown, relatively broad.

Terminalia (figs. 108–109): Hypopygium 0.70 – 0.77 mm (N=3) wide, broad and robust. Gonostyli 0.35 – 0.46 mm (N=3), short, robust, apically pointed. Epandrium mesally with a shallow, V-shaped cleft.

Female unknown.

Fig. 108 View FIGURES 107 – 109 . Male, terminalia, dorsal. RGFL Bois d’Asson 81. Fig. 109 View FIGURES 107 – 109 . Male, terminalia. RGL Bois d’Asson 34.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Bibionidae

Loc

Plecia Wiedemann, 1828

Skartveit, John & Nel, André 2017
2017
Loc

Plecia assonensis

Gentilini 1993: 161
1993
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