Arkaditilla bagrada (Cameron, 1902) Okayasu, 2021

Okayasu, Juriya, 2021, A new velvet ant genus Arkaditilla (Hymenoptera, Mutillidae, Trogaspidiini) from the Oriental Region, with review of species, Journal of Hymenoptera Research 84, pp. 145-168 : 145

Arkaditilla bagrada (Cameron, 1902) comb. nov.

Figures 1 , 2 , 13 , 19 , 25 , 26 , 37 , 38 , 49-51 , 67 , 73

Mutilla bagrada Cameron, 1902: 76, ♂, holotype ♂ (Kuching, Sarawak, [Malaysia]) [Natural History Museum, London, UK].

Timulla (Trogaspidia) bagrada : Mickel 1935: 263, ♂; 1937: 449, ♂.

Krombeinidia bagrada : Lelej, 1996a: 11; 2005: 65; Lo Cascio 2015: 550; Pagliano et al. 2020: 250.

Petersenidia bagrada : Lelej 1996b: 95, ♂.

Diagnosis.

Male. Clypeus dorsally elevated, sloping ventrally. Mandible with sharp subapical and large inner subbasal teeth (Fig. 13 ), ventrally deeply excised with large basal tooth (Fig. 19 ). Scape ventral carinae subparallel, mostly smooth between them (Fig. 25 ); F1 apical 1/3 and F2 basal 1/2 yellow, F2 apical 1/2 and F3-F11 with ventral reddish brown patch; F1 cylindrical (Fig. 26 ). T3 orange (Fig. 2 ); cuspis strongly widened on posterior 1/3 with rounded apex (Figs 49 , 67 ); digitus posteriorly slender stick-like (Fig. 37 ); paracuspis stick-like (Fig. 67 ); penis valve weakly expanded ventrally (Figs 50 , 51 ). Female. Unknown.

Material examined.

24♂. Malaysia: Negeri Sembilan: Pasoh Forest Reserve, 25.III-2.IV.1993, K. Konishi & K. Maeto leg., coarse Malaise trap, plot 2 [2♂ FRIM, NARO], 2-8.IV.1993 [1♂ FRIM], 8-15.IV.1993 [1♂ NARO]; Pasoh Forest Reserve, 25.III-2.IV.1993, K. Konishi & K. Maeto leg., fine Malaise trap, plot 2 [2♂ FRIM, NARO]; Pasoh Forest Reserve , 26.III-3.IV.1993, K. Konishi & K. Maeto leg., coarse Malaise trap, plot 4 [1♂ FRIM], 9-16.IV.1993 [1♂ NARO]; Pasoh Forest Reserve , 3-9.IV.1993, K. Konishi & K. Maeto leg., fine Malaise trap, plot 4 [1♂ FRIM]; Pasoh Forest Reserve , 26.XI-3.XII.1993, K. Maeto leg., coarse Malaise trap, plot 1 [2♂ FRIM, NARO]; Pasoh Forest Reserve , 26.XI-3.XII.1993, K. Maeto leg., coarse Malaise trap, plot 4 [2♂ FRIM, NARO]; Pasoh Forest Reserve , 26.XI-3.XII.1993, K. Maeto leg., fine Malaise trap, plot 1 [2♂ FRIM, NARO], 10-17.XII.1993 [1♂ FRIM]; Pasoh Forest Reserve , 26.XI-3.XII.1993, K. Maeto leg., fine Malaise trap, plot 3 [1♂ NARO], 10-17.XII.1993 [1♂ FRIM]; Pasoh Forest Reserve , 26.XI-3.XII.1993, K. Maeto leg., fine Malaise trap, plot 4 [1♂ NARO], 3-10.XII.1993 [1♂ NARO]; Pasoh Forest Reserve , 3-10.XII.1993, K. Maeto leg., coarse Malaise trap, plot 6 [1♂ NARO]; Pasoh Forest Reserve , 10-17.XII.1993, K. Maeto leg., coarse Malaise trap, plot 2 [1♂ FRIM]; Pasoh Forest Reserve , 10-17.XII.1993, K. Maeto leg., fine Malaise trap, plot 2 [2♂ FRIM, NARO] .

Identification source.

Keyed using Mickel (1935) and compared with the original description. No differences were found between the specimens examined herein and Cameron’s description.

Distribution.

Indonesia: Kalimantan Timur ( Lelej 1996b). Malaysia: Negeri Sembilan*, Sarawak ( Cameron 1902; Mickel 1937).

Remarks.

This is the only species in Arkaditilla with F1 cylindrical, like most species of Mutillinae . Similarly, the species of East Asian genera of the former Petersenidiini , like Krombeinidia , Orientidia Lelej, 1996, Pagdenidia Lelej, 1996, Petersenidia , Taiwanomyrme Tsuneki, 1993, and Zavatilla Tsuneki, 1993, have the F1 cylindrical. I presume that this is a plesiomorphic state in Arkaditilla , and A. bagrada is sister to the remaining members of the genus.

Figures

Figures 1 - 6. Arkaditilla spp., ♂, habitus 1, 3, 5 dorsal view 2, 4, 6 lateral view 1, 2 A. bagrada (Cameron) 3, 4 A. depressicornis (Mickel) 5, 6 A. frim sp. nov., holotype. Scale bars: 3 mm.

Figures 13 - 18. Arkaditilla spp., ♂, face 13 A. bagrada (Cameron) 14 A. depressicornis (Mickel) 15 A. frim sp. nov., holotype 16 A. gibba sp. nov., paratype 17 A. leleji sp. nov., holotype 18 A. nallinia (Zavattari).

Figures 19 - 36. Arkaditilla spp., ♂ 19 - 24 mandible, lateral view 25, 27, 29, 31, 33, 35 scape, ventral view 26, 28, 30, 32, 34, 36 pedicel, F 1, and F 2, lateral view 19, 25, 26 A. bagrada (Cameron) 20, 27, 28 A. depressicornis (Mickel) 21, 29, 30 A. frim sp. nov., holotype 22, 31, 32 A. gibba sp. nov., holotype 23, 33, 34 A. leleji sp. nov., holotype 24, 35, 36 A. nallinia (Zavattari).

Figures 37 - 48. Arkaditilla spp., ♂, genitalia 37, 39, 41, 43, 45, 47 dorsal view 38, 40, 42, 44, 46, 48 ventral view 37, 38 A. bagrada (Cameron) 39, 40 A. depressicornis (Mickel) 41, 42 A. frim sp. nov., holotype 43, 44 A. gibba sp. nov., holotype 45, 46 A. leleji sp. nov., holotype 47, 48 A. nallinia (Zavattari).

Figures 49 - 66. Arkaditilla spp., ♂, genitalia 49, 52, 55, 58, 61, 64 genital capsule and volsella, inner view 50, 53, 56, 59, 62, 65 left penis valve 51, 54, 57, 60, 63, 66 right penis valve 49 - 51 A. bagrada (Cameron) 52 - 54 A. depressicornis (Mickel) 55 - 57 A. frim sp. nov., holotype 58 - 60 A. gibba sp. nov., holotype 61 - 63 A. leleji sp. nov., holotype 64 - 66 A. nallinia (Zavattari).

Figures 67 - 72. Arkaditilla spp., ♂, genital volsella, ventro-inner view 67 A. bagrada (Cameron) 68 A. depressicornis (Mickel) 69 A. frim sp. nov., holotype 70 A. gibba sp. nov., holotype 71 A. leleji sp. nov., holotype 72 A. nallinia (Zavattari). White arrows indicate the paracuspis.

Figure 73 - 76. Distributional map of Arkaditilla spp. based on specimens examined herein and the literature (Cameron 1902; Lelej 1996 b; Mickel 1935, 1937; Zavattari 1914) 73 A. bagrada (Cameron) (red circle) 74 A. depressicornis (Mickel) (blue circle) 75 A. frim sp. nov. (yellow circle), A. gibba sp. nov. (purple triangle), and A. leleji sp. nov. (light blue square) 76 A. nallinia (Zavattari) (orange circle).