Belongs within: Ichneumonidae.
Orthocentrus is a cosmopolitan genus of small orthocentrine ichneumon wasps lacking an exposed labrum (Gauld 1984).
Characters (Gauld 1984): Small species, fore wing length 3–5 mm; clypeal margin slightly convex, truncate or concave, covering labrum; face smooth and polished to granulate or coriaceous, matt; subocular sulcus present or absent; eyes hairy or glabrous. Flagellum of female usually rather short and either moniliform or with segments quadrate. Notaulus present or absent, mesoscutal crest present or absent; epicnemial carina present on mesopleuron; propodeum with posterior transverse and lateromedian longitudinal carinae usually well-developed, sometimes with lateral carinae also present; pleural carinae present or absent. Fore wing with cu-a usually distal to base of Rs+M; 3r-m present or absent, if present areolet may be pentagonal or obliquely rhombic. Hind wing with Cu1+cu-a more or less vertical, anterodistal corner of sub-basal cell about 90°. Gaster barely lateralIy compressed; ovipositor generally short, its total length 1.0–1.5 times length of hind basitarsus.
<==Orthocentrus Gravenhorst 1829 (see below for synonymy)G84
|--*O. fulvipes Gravenhorst 1829G84
|--O. californicus [=*Tapinops californicus]G84
|--O. daucus Gauld 1984G84
|--‘*Orthocentrellus’ elongaticornis Benoit 1954G84
|--O. excalibur Gauld 1984G84
|--‘*Exochiscus’ pusillus Walsh 1873G84
|--‘*Phaenosemus’ sitkensisG84
|--‘*Atmetus’ tetrazonatusG84
|--O. trichomma Gauld 1984G84
`--‘*Pachyonyx’ trifasciatusG84
Orthocentrus Gravenhorst 1829 [incl. Atmetus Foerster 1869, Exochiscus Walsh 1873, Orthocentrellus Benoit 1954, Pachyonyx Viereck 1914 non Schoenherr 1837, Phaenosemus Foerster 1869, Tapinops Foerster 1869]G84
*Type species of generic name indicated
References
[G84] Gauld, I. D. 1984. An Introduction to the Ichneumonidae of Australia. British Museum (Natural History).