Oobius

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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 …………………………………………………………… 5

4(3) Club length about 2x width …………………………………………….………………. sp. 3
4’ Club length almost 3x width  ………………………………………………………………. sp. 6

5(3) F6 subquadrate  …………….………………………………………………………………. 6
5’ F6 length about 1.3x width  ………………………………………………………………..…. 7

6(5) F1-3 transverse, F4-6 subquadrate ……….……………………..……………….…. dahlsteni
6’ F-1 subquadrate, F2-5 transverse …………..……………………..……………..…….….. sp. 5

7(5) F6 concolorous with rest of funicle ………………………………………………………… 8
7’ F6 distinctly paler than rest of funicle ……………………………………………..………….. 9

8(7) Club length about 2.5x maximum width ………………………………….…………….. sp. 1
8’ Club length at least 3.0x maximum width ………………………………………. ……… sp. 4

9(7) F2-5 not all wider than long, at least F5 quadrate …………….…………………. buprestidis
9’ 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)

 

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.

 

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.