Durbadnus obscuripes (Forsius, 1931) Koch & Liston, 2012

Koch, Frank & Liston, Andrew D., 2012, Revision of Durbadnus Pasteels, 1954, with notes on other Afrotropical Blennocampinae and Allantinae (Hymenoptera: Symphyta: Tenthredinidae), African Invertebrates 53 (2), pp. 645-645 : 654-655

publication ID	https://doi.org/ 10.5733/afin.053.0204
persistent identifier	https://treatment.plazi.org/id/836E1D24-BB35-FF84-FE09-04E4BA13FAA6
treatment provided by	Felipe
scientific name	Durbadnus obscuripes (Forsius, 1931)
status	comb. nov.

Treatment

Durbadnus obscuripes (Forsius, 1931) , comb. n.

Figs 16–19 View Figs 16–19 , 30, 31 View Figs 28–33

Blennocampa obscuripes: Forsius 1931: 28–30 , ♀. Type locality: South Africa, Eastern Cape, Umtata .

Kivua obscuripes: Pasteels 1949 a: 60 .

Redescription:

Female.

Head black; apical half of mandible reddish brown. Thorax black; pronotum, tegula, lateral lobes of mesoscutum except for a large black medial spot, medial lobe of mesoscutum at extreme angle, and postspiracular sclerite orange. Legs black; apical half of fore femur and fore tibia yellow. Wings uniformly slightly infuscate; stigma, costa, subcosta, and rest of venation blackish. Abdomen black.

Head very slightly narrowed behind eyes. Antenna 1.3 times as long as maximum head width; flagellomere 1 0.7 times as long as flagellomeres 2/3 combined. POL:OOL = 1.0:0.7. Postocellar area: width:length = 1.0:0.5–0.6 (0.6 HT), lateral furrows convex. Supra-antennal grooves large and deep, with conspicuous furrow towards lateral margin of torulus. Interantennal area with shallow, transverse oval groove and two small lateral grooves, longitudinal furrow interrupts front margin of frontal area medially and ends at front ocellus. Eyes converge downwards, lower interocular distance 1.1 times as long as eye length. Supraclypeal furrow deep.

Head very sparsely micropunctate, shiny; pubescence on head brown, somewhat shorter than diameter of lateral ocellus. Thorax nearly impunctate, shiny; pubescence yellow, shorter than that on head. In fore wing, cells 1Rs and 2Rs subequal in length; stub of 2A+3A furcate ( Fig. 20 View Figs 20–23 ).

Tergum 1 with wide and deep medial excision.Terga 1/2 smooth and shiny, following terga sparsely micropunctate, shiny. Sawsheath in lateral view roundly pointed at apex ( Fig. 17 View Figs 16–19 ), in dorsal view very narrow towards apex.

Lancet ( Fig. 18 View Figs 16–19 ) has very long setae, especially at basal half; with approx. 18–19 serrulae; serrulae at centre flatly prominent, with about 7 or 8 irregular posterior denticles and 4 or 5 irregular anterior denticles ( Fig. 19 View Figs 16–19 ).

Length 6.7–8.0 mm.

Male. Unknown.

Holotype (examined): ♀ “Type, H. T.” [red circle]; “ S. Africa, R. E. Turner, Brit. Mus., 1923-189”; “Umtata [31°35'S 28°47'E], Transkei [= Eastern Cape], 18.II-18.III.923”; “ B. M. Type, Hym., 1.378”; “ Blennocampa obscuripes n. sp. ♀, R. Forsius”; “ Holotypus, Blennocampa obscuripes Forsius ♀, teste: F. Koch, 2011” [red]; “ Durbadnus obscuripes (Forsius) ♀, det.: F. Koch, 2011” ( BMNH). Condition: Right fore wing damaged GoogleMaps . Paratype (examined): 1♀ same data as holotype ( UZMT). Condition: Fair GoogleMaps .

Distribution: South Africa ( Fig. 34 View Fig ).

Remarks. The colour pattern of D. obscuripes is very similar to that of D. taegeri . However, the latter species differs in having yellowish fore tibiae and because of the smaller black medial spot on the lateral lobes of mesoscutum. In D. taegeri , flagellomere 1 is as long as flagellomeres 2/3 combined, whereas in D. obscuripes , flagellomere 1 is conspicuously shorter. In particular, D. obscuripes is distinguished by the shape of serrulae, which are flatter than in D. taegeri . Furthermore, the lancet of D. obscuripes , especially at its base, bears very large sensilla. In the paratype, these sensilla are also present, but somewhat fewer in number. It is possible that they break off during oviposition.