Brachystoma obscuripes Loew, 1856

Brachystoma obscuripes Loew, 1856 View in CoL

( Figs 6A, B View FIG ; 7A, B View FIG )

Brachystoma obscuripes Loew, 1856: 37 View in CoL .

MATERIAL EXAMINED. — France • 1♂; Corsica, Ostriconi (2B); 42°39’25”N, 9°3’44”E; 17 m; 7.V.2015; C. Daugeron & E. Delfosse leg.; voucher code: EMPB15; GenBank COI gene: PP501168 ; MNHN-ED-ED11763 GoogleMaps • 1 ♀; same data as for preceding; voucher code: EMPB12; GenBank COI gene: PP501167 ; MNHN-ED-ED11764 GoogleMaps • 1♂, 6♀; same data as for preceding; MNHN GoogleMaps • 2 ♂, 4 ♀; Corsica; crossing of roads D84/D618; 42°20’45”N, 9°2’0”E; 720 m; 7.V.2015; C. Daugeron & E. Delfosse leg.; MNHN GoogleMaps • 38 ♂, 43 ♀; Corsica, Zonza, Samulaghia , dry sapinière forest, 41°45.703’N, 09°13.649’E, 1208 m, 24-28.VI.2019 ( yellow pan trap), leg. Marc Pollet; MNHN GoogleMaps .

Italy • 1 ♂; Sardegna, Carbonia-Iglesias, Domusnovas, sa Duchessa ; UTM-WGS84 32 S 464990 4358384; 371 m; 4-18.III.2006; G. Chessa leg.; malaise trap S2; CNBF ( CNBFVR) • 1 ♀ (without head); Sardegna Carbonia-Iglesias, Iglesias, near colonia Beneck ; UTM-WGS84 32 S 462391 4355441; 636 m; 18.IV-2.V.2006; G. Chessa leg; malaise trap S1; CNBF ( CNBFVR) .

TYPE MATERIAL AND LOCALITY. — Two specimens were found in the Loew collection in MfN. Loew (1856: 10) clearly specifies that his new species of Brachystoma was collected in Corsica by Mr Mann: “Sonst fiel mir unter Herrn Mann’s Corsikanischen Diptern eine neue Art der Gattung Brachystoma auf…”; in addition the label “ Corsica / Mann” was attached to the two specimens ( Fig. 6 View FIG ). Therefore the type locality is more likely Corsica and not Sardinia as indicated in the original description (1856: 37).

The original description is based on male and female specimens but the number of specimens is not specified; the two specimens found in Loew collection correspond to the original description and here considered conspecific. Consequently the male is herewith designated as lectotype of Brachystoma obscuripes Loew and labelled accordingly to fix and stabilize the current concept of the name ( Fig. 6 View FIG ). The second specimen, a female, becomes a paralectotype of the species.

DISTRIBUTION ( Fig. 8 View FIG ). — France ( Corsica); Italy ( Sardinia).

DESCRIPTION

Similar to B. vesiculosum except for the following characters: smaller species (length of wing = 5-5.5 mm). Postocular setae somewhat stronger. Fore and mid coxae black-brown to yellowish posteroventrally, hind coxa brownish but more widely yellowish ventrally and posteriorly. All femora black with similar pattern of distinctly stronger setae. Male hypopygium distinctly smaller, cercus without pre-apical bulge, posterodorsal part of epandrium shorter, ventral epandrial setae not so strong, phallus not upright but more horizontal to the epandrium.

DNA BARCODE

A 658 base-pair fragment of the COI gene was amplified and sequenced from two specimens (EMPB15, male and EMPB12, female). Both sequences match 100% but the divergence rate with B. vesiculosum is about 3%.