Penthetria graciliventris ( Théobald, 1937 ) Theobald, 1937

Skartveit, John & Nel, André, 2017, Revision of fossil Bibionidae (Insecta: Diptera) from French Oligocene deposits, Zootaxa 4225 (1), pp. 1-83 : 24-27

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.6039601

persistent identifier

https://treatment.plazi.org/id/03A9879C-FFE9-F426-45D3-33237F453B47

treatment provided by

Plazi

scientific name

Penthetria graciliventris ( Théobald, 1937 )
status

comb. nov.

Penthetria graciliventris ( Théobald, 1937) View in CoL comb.n.

(Figs. 10, 81–84)

Plecia graciliventris Théobald 1937: 138 View in CoL .

Fig. 79 View FIGURES 78 – 80 . Female, wing. NMB F1389/1.

Fig. 80 View FIGURES 78 – 80 . Male, terminalia, dorsal. NMB F1399/1.

Fig. 82 View FIGURES 81 – 84 . Female, wing. MNHN Monteils 25.

Fig. 83 View FIGURES 81 – 84 . Male, terminalia, dorsal. MNHN Monteils 57. Fig. 84 View FIGURES 81 – 84 . Male, head and thorax. MNHN Monteils 57.

The type of this species was said to be in Marseille, but we could not find it and it is possibly lost. However, some specimens from Monteils of a very distinctive, slender habitus fit perfectly Théobald (1937) ’s drawing (Pl. XI, Fig. 5) and description.

Material. 3 males (MNHN Monteils 35, Fig. 10, Monteils 55, Monteils 57.), 1 female: MNHN Monteils 25.

Localities. Célas, Monteils.

Diagnosis. A medium-sized species (8 – 9.5 mm) with an unusually slender habitus. The species is easily recognized by its very gracile body—the superficial habitus of a female of this species is more like a male of a typical bibionid, with a long, slender abdomen. The specimens at hand are of a uniform, brown colour. The strongly convex thorax gives this species a hunch-back appearance. Male gonostylus rather small, curved and pointed, epandrium small, subquadrate with a mesal indentation.

Redescription. Male. Total length 8.3 – 9.0 mm (N=3). Dark brown, likely black in life.

Head (fig. 84): Length 1.0 – 1.1 mm (N=3). Brown, rounded, compound eye rather small and rounded. Antenna rather short, flagellum possibly 7-segmented. Ocellar tubercle small.

Thorax: Length 2.0 – 2.1 mm (N=3). Short and strongly convex. Haltere light brown.

Wing (fig. 81): Length 6.1 – 6.9 mm (N=3), width 1.8 – 2.2 mm (N=3), length/width = 2.78 – 3.32 (N=3). Rather long and slender, light brown fumose, anterior area a little darker. Costa extends to nearly half-way between apices of R4+5 and M1. Humeral vein present, Subcosta relatively short, terminating mid-way between crossvein R-M and origin of R2+3. R-veins brown, posterior veins colourless. Pterostigma invisible. Vein R2+3 slightly sinuous, R4+5 distally distinctively curved. Basal part of Rs subparallel to M. Wing vein measurements in Table 1 View TABLE 1 .

Legs: Brown, slender. Fore femur 1.8 mm (N=1), fore tibia 1.9 mm (N=1), hind femur 2.3 – 2.8 mm (N=3), hind tibia 2.4 – 2.7 mm (N=2).

Abdomen: Length 6.6 – 6.8 mm (N=3). Long and narrow, cylindrical.

Terminalia (fig. 83): Epandrium quite small, suboval. Gonostyli relatively small, digitiform, curved and pointed.

Female: Total length 9.5 mm (N=1).

Head: Width 1.3 mm.

Thorax: Length 2.9 mm. Shape apparently as in male. Haltere pale brownish.

Wing (fig. 82): Length 7.8 mm, width 2.8 mm, length/width = 2.63. Light brown fumose, veins brown, pterostigma indistinctive. Costa extends to half-way between apices of R4+5 and M1. Humeral vein present, Subcosta relatively long. R2+3 nearly straight. Posterior veins fine, not possible to trace in specimen at hand.

Legs: Slender but not particularly long, femorae slightly clavate. Tibial spurs needle-thin. Fore femur 2.3 mm, fore tibia 2.1 mm, hind femur 2.5 mm, hind tibia 3.0 mm.

Abdomen: Length 7.2 mm, width 2.1 mm. Long and cylindrical, not apically tapered.

Terminalia: Abdominal tip rounded.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Diptera

Family

Bibionidae

Genus

Penthetria

Loc

Penthetria graciliventris ( Théobald, 1937 )

Skartveit, John & Nel, André 2017
2017
Loc

Plecia graciliventris Théobald 1937 : 138

Theobald 1937: 138
1937
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