Last updated September 2018
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1 Club undivided ……………. ……………………………………………..……….… nearcticus
1’ Club 3 segmented ………………………………………………………………………….…. 2
2(1) Scape length about 2.5 – 3.0x width ……………………..…………………………… longoi
2’ Scape length about 4.0x width or greater ………………..……………………………………. 3
3(2) Fore coxae completely yellow ………….…………………………………………….……. 4
3’ Fore coxae at least partly darkened …………………………………………………………… 6
4(3) Club length about 2x width …………………………………………….………………. sp. 3
4’ Club length almost 3x width ……………………………………………………………….5
5(4) F4 longer than wide, F6 concolorous with funicle, ovipositor length about 0.33 metasoma …… sp. 6
5′ F4 quadrate, F6 lighter than other funicle segments, ovipositor length less than 0.2x metasoma …. sp. 7
6(3) F6 subquadrate …………….………………………………………………………………. 7
6’ F6 length about 1.3x width ………………………………………………………………..…. 8
7(6) F1-3 transverse, F4-6 subquadrate ……….……………………..……………….…. dahlsteni
7’ F-1 subquadrate, F2-5 transverse …………..……………………..……………..…….….. sp. 5
8(6) F6 concolorous with rest of funicle ………………………………………………………… 9
8’ F6 distinctly paler than rest of funicle ……………………………………………..………….. 10
9(8) Club length about 2.5x maximum width ………………………………….…………….. sp. 1
9’ Club length at least 3.0x maximum width ………………………………………. ……… sp. 4
10(8) F2-5 not all wider than long, at least F5 quadrate …………….…………………. buprestidis
10’ F2-5 wider than long, almost annellar ………..…………………………………….…….. sp. 2
Sp. 1 Nevada (UCDC)
Sp. 2 Imperial, Solano (UCDC)
Sp. 3 Contra Costa, Marin (RLZC)
Sp. 4 Tuolumne (UCFC)
Sp. 5 Marin (RLZC)
Sp. 6 Contra Costa, Shasta (RLZC, UCDC)
Sp. 7 Marin (RLZC)
Described Nearctic species and distribution
agrili Zhang & Huang, 2005 (in Zhang et al.): Introduced from China to USA (CA)
buprestidis (Gordh & Trjapitzin, 1981): USA (CA, OR)
dahlsteni (Trjapitzin, 1971): USA (CA)
depressus (Girault, 1916): USA (IL)
longoi (Siscaro, 1992): Introduced from Australia to USA (CA)
minusculus Triapitsyn & Petrice, 2015 (in Triapitsyn et al.): USA (MI)
nearcticus (Trjapitzin, 1977): USA (CA)
whiteorum Triapitsyn, 2015 (in Triapitsyn et al.): USA (PA)
Remarks
Triapitsyn et al (2015) presented a key to the Nearctic species. In the USNM there are only three specimens of O. depressus, but all are missing the head.
References
Girault, A.A. 1916. Descriptions of an observations on some chalcidoid Hymenoptera – II. The Canadian Entomologist 48: 337-344.
Gordh, G. & V.A. Trjapitzin. 1981. Taxonomic studies of the Encyrtidae with the descriptions of new species and a new genus. University of California Publications in Entomology 93: 55 pp.
Siscaro, G. 1992. Avetianella longoi sp. n. (Hymenoptera Encyrtidae) egg parasitoid of Phoracantha semipunctata F. (Coleoptera Cerambycidae). Bollettino di Zoologia Agraria e Bachicoltura, Milano 24: 205-212.
Triapitsyn, S.V., T.R. Petrice, M.W. Gates & L.S. Bauer. 2015. Two new species of Oobius Trjapitzin (Hymenoptera, Encyrtidae) egg parasitoids of Agrilus spp. (Coleoptera, Buprestidae) from the USA, including a key and taxonomic notes on other congeneric Nearctic taxa. ZooKeys 498: 29-50.
Trjapitzin, V.A. 1971. A Nearctic representative of the genus Avetianella Trjapitzin, 1968 (Hymenoptera, Encyrtidae). Entomologicheskoe Obozrenie 50: 890-892.
Trjapitzin, V.A. 1977. New genera and species of parasitic Hymenoptera of the family Encyrtidae (Hymenoptera: Chalcidoidea). Folia Entomologica Hungarica 30: 153-166.
Zhang, Y.Z., D.-W. Huang, T.-H. Zhao, H.-P. Liu & L.S. Bauer. 2005. Two new species of egg parasitoids (Hymenoptera: Encyrtidae)of wood-boring beetle pests from China. Phytoparasitica 33: 253-260.