Durbadnus Pasteels, 1954

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 : 651-652

publication ID	https://doi.org/ 10.5733/afin.053.0204
persistent identifier	https://treatment.plazi.org/id/836E1D24-BB3A-FF89-FE3C-05E3BF17FD8E
treatment provided by	Felipe
scientific name	Durbadnus Pasteels, 1954
status

Treatment

Genus Durbadnus Pasteels, 1954

Durbadnus: Pasteels 1954: 503 . Type species: Monophadnus chubbi Forsius, 1930 , by orig. des.

Redescription:

Length 6.0–8.0 mm. Head and abdomen black, thorax black with orange-yellow markings. Antenna filiform, 9-segmented and longer than maximum head width, flagellomere 1 conspicuously longer than flagellomere 2 or flagellomere 3. Head sparsely micropunctate, shiny, without strongly developed structures. Occipital carina absent. Supra-antennal crest moderately developed. Frontal area indistinctly limited. Malar space absent. Clypeus subtruncate, very slightly enlarged medially. Each mandible with strongly developed, double-shouldered, subapical tooth ( Fig. 27 View Figs24–27 ). Tarsal claws cleft apically, with inner tooth somewhat shorter, and large basal lobe ( Fig. 16 View Figs 16–19 ). Epicnemium absent. In fore wing, M slightly curved and parallel to 1m –cu ( Figs 10 View Figs 10–15 , 20 View Figs 20–23 ); cells 1Rs and 2Rs subequal in length ( Fig. 20 View Figs 20–23 ) or 2Rs is as long as 1R1 and 1Rs united ( Fig. 10 View Figs 10–15 ); stub of 2A+3A nearly straight or furcate at apex. Hind wing without closed cells Rs and M, anal cell 2A present and about equal to width of short petiolate anal cell 1A ( Figs 10 View Figs 10–15 , 20 View Figs 20–23 ). Tergum 1 with more or less wide, deep medial excision.

Remarks: Pasteels (1949 a) recognized that M. chubbi Forsius, 1930 is atypical for Monophadnus , because as described by Forsius (1930), the tarsal claws are cleft apically and lobed basally, whilst Monophadnus Hartig, 1837 has simple claws, without basal lobe and subapical tooth. Pasteels (1954) described Durbadnus after he had seen a male of D. chubbi collected by Marley in 1945. However, he perpetuated a mistake made by Forsius (1930): “Hind wings with one closed middle cell”. Actually, in Durbadnus the hind wing does not have a closed middle cell, i.e. cells RS and M are missing.

In the course of this revision, the holotypes of three species described by Forsius (1931) ( Blennocampa bensoni , B. obscuripes and B. sudanica ) were examined, because they had been described as having a colour pattern similar to Durbadnus . It was found that B. bensoni and B. obscuripes belong to Durbadnus , whereas B. sudanica was confirmed as belonging to Kivua Forsius, 1934 , where it was placed by Pasteels (1949 a).

Durbadnus species have so far only been found in South Africa, whereas species of the morphologically similar genera Tesslinia Pasteels, 1951 and Aethiocampa Pasteels, 1949 have an Equatorial distribution. The larvae and host plants of Durbadnus are unknown.

Kingdom	Animalia
Phylum	Arthropoda
Class	Insecta
Order	Hymenoptera