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Euderus Haliday, 1844 comparative info return to: prev home
Flagellomeres in males of most species similar to those of females, but pedicellate with whorls of setae in some species; some species with pedicellate flagellomeres have an incomplete second whorl of setae on the basal funicular segment. Scutellum slightly overhanging dorsellum. Forewing almost never with fuscate regions; almost always with 2-3 setal tracks radiating from stigmal apex, rarely with tracks not discernable; postmarginal vein 1.1-1.75x stigmal vein length. Propodeum almost always with median carina (absent in some species where the propodeum is very short or with strong rugae); subgenus Secodelloidea Girault with strongly rugose propodeum. Apical gastral tergite much shorter than preceding tergite in most species (many exceptions, but these are extralimital). Compare with: Parasecodella, Allocerastichus, Carlyleia.

1a-b: Typical Euderus gaster (left), and forewing (right)

2a-b: Typical Euderus propodeum (left), and Euderus (Secodelloidea) propodeum (right)

3a-b: Euderus female antenna (left), and E. viridilineatus Yoshimoto male antenna (right, atypical of genus)

Biology: Primary or secondary (through Ichneumonoids) parasitoids of larvae in concealed situations (Lepidoptera, Coleoptera, Cynipidae).

Comments: Large genus, and difficult to define with universally applicable characters. Many exceptional forms are locally common in certain areas, especially forms that would seem to approach or overlap Parasecodella.

Comparative information:

Parasecodella: Forewing with indistinct or no setal tracks radiating from stigma, and: females with both pedicel and 1st funicular segment 2x longer than broad, apical funicular segments much shorter than basal ones; males with nodose flagellomeres and 1st funicular segment with two complete whorls of erect setae. All characters must be present in combination, as any of them may occur in Euderus. The character most infrequently found in Euderus is the lack of setal tracks radiating from the stigma.

Allocerastichus: Antennal radicle elongate, nearly as long as pedicel. Propodeum without median carina. Gt1 with 2 or 3 dorsal carinae in females, 1 in males; last gastral tergite much longer than preceding tergite in females of all species.

Carlyleia: No rows of setae radiating from stigma. Propodeum without median carina. Last gastral tergite much longer than preceding tergite in all females.

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References

Boucek, Z. 1963. Studien über europäische Eulophidae, III: Euderinae (Hymenoptera: Chalcidoidea). Beiträge zur Entomologie. 13: 257-281.

Coote, L.D. 1994. Review of Nearctic genera of Euderinae (Hymenoptera: Eulophidae), with descriptions of two new species of Allocerastichus Masi, and redescription of Carlyleia marilandica Girault. Canadian Journal of Zoology. 72: 1044-1054.

Schauff, M.E., J. LaSalle, & L.D. Coote. 1997. Chapter 10. Eulophidae. in "Annotated Keys to the Genera of Nearctic Chalcidoidea (Hymenoptera)". G.A.P. Gibson & J.T. Huber, eds. NRC Research Press, Ottawa.

Yoshimoto, C. 1971. Revision of the genus Euderus of America north of Mexico (Hymenoptera: Eulophidae). Canadian Entomologist. 103: 541-578.

Image credits: 1a-b, 3a-b: Coote (1994). 2a-b: Schauff, et al. (1997).