Belongs within: Pentatominae.
The Diemeniini are an Australasian group of shield bugs characterised by the presence of a series of stridulatory ridges ventrolaterally on the anterior segments of the abdomen.
Characters (from Gross 1976, as ‘Diemenia group’): Medium-sized, 5–14 mm in length, elongate-oval in shape, dorsal surface usually strongly punctate. Antennae four- or five-segmented; juga frequently surpassing apex of anteclypeus, may be reflexed laterally, often produced into small lobe or process in front of eye. Abdomen with strigose vittae forming curved line laterally on segments 2, 3 and/or 4. Posterior outline of male pygophore mostly complex; clasper may be Y-shaped, thin and elongate, or flattened and rather plate-like; phallosoma heavily or only moderately sclerotised; thecal shield absent; conjunctiva bilobed with additional median and ventral lobes sometimes present; median penial plates small and laminate, or forming funnel-like sheath around vesica, or absent; vesica short and robust.
<==Diemeniini [Diemeninae]
|--CaridophthalmusG76
|--Aplerotus Dallas 1851G76
| `--*A. maculatus Dallas 1851G76
|--Boocoris Gross 1976G76
| `--*B. bufiformis Gross 1976G76
|--Gilippus Stål 1867G76
| `--*G. hostilis Haglund 1868G76
|--Pseudoncocoris Gross 1976G76
| `--*P. southcotti Gross 1976G76
|--Alphenor Stål 1867G76
| |--*A. cuspidatus Stål 1869 [incl. Myappena capito Distant 1910]G76
| `--A. victoriensis Gross 1976G76
|--Kalkadoona Distant 1910 [incl. Stelgidophora Bergroth 1912]G76
| |--K. pallida (Van Duzee 1905) (see below for synonymy)G76
| |--K. confinis (Dallas 1851) [=Dictyotus confinis]G76
| |--K. cooperi Gross 1976G76
| `--K. enchylaenae Gross 1976G76
|--Diemenia Spinola 1850G76
| |--D. rubromarginata (Guérin-Méneville 1830) [=Platycoris rubromarginatus]G76
| | |--D. r. rubromarginataG76
| | `--*D. r. deyrollei Spinola 1850 [incl. Platycoris affinis, P. distinctus]G76
| `--D. immarginata [=Platycoris immarginatus]G76
|--Niarius Stål 1867G76
| |--*N. umbrosus (Stål 1865) [=Platycoris umbrosus]G76
| |--N. haglundi Montandon 1903G76
| |--N. illuminatus Distant 1881 [incl. N. tryoni Bergroth 1905]G76
| |--N. ooldeae Gross 1976G76
| `--N. venosusG76
`--Oncocoris Mayr 1866G76
|--*O. punctatus Mayr 1866G76
|--O. apicalis (Dallas 1851) [=Dictyotus apicalis]G76
|--O. desertus Bergroth 1916G76
|--O. discoideus (Dallas 1851) [=Dictyotus discoideus]G75
|--O. favillaceus (Walker 1867) [=Tarba favillacea, Dictyotus favillaceus]G75
|--O. geniculatus (Dallas 1851)G76 [=Dictyotus geniculatusG76; incl. O. dimidiatusG76, D. lineatus Walker 1867G75]
|--O. lineatusG76
|--O. semimarginatus (Westwood 1837) [=Pentatoma semimarginata, Dictyotus semimarginatus]G75
|--O. similis (Dallas 1851)G76 [=Dictyotus similisG76; incl. Pentatoma truncatula Walker 1867D00]
|--O. transversus (Carpenter 1891) [=Dictyotus transversus]G75
|--O. truncatellus (Walker 1868) [=Eysarcoris truncatellus, Dictyotus truncatellus]G75
`--O. ventralis (Walker 1867) [=Mormidea ventralis, Dictyotus ventralis]G75
Kalkadoona pallida (Van Duzee 1905) [=Dictyotus pallidus, *Stelgidophora pallida; incl. *K. centromaculata Distant 1910]G76
*Type species of generic name indicated
References
[D00] Distant, W. L. 1900. Rhynchotal notes.—IV. Heteroptera: Pentatominae (part) (concluded). Annals and Magazine of Natural History, series 7, 5: 420–435.
[G75] Gross, G. F. 1975. Plant-feeding and Other Bugs (Hemiptera) of South Australia. Heteroptera—Part I. Handbook of the Flora and Fauna of South Australia.
[G76] Gross, G. F. 1976. Plant-feeding and Other Bugs (Hemiptera) of South Australia. Heteroptera—Part II. Handbook of the Flora and Fauna of South Australia.