Canadian Forest Service Publications
Eustochomorpha girault, Neotriadomerus gen. n.' and Proarescon gen. n. (Hymenoptera, Mymaridae), early extant lineages in evolution of the family. 2017. Huber, J.T. Journal of Hymenoptera Research 57:1-87.
Issued by: Great Lakes Forestry Centre
Catalog ID: 38842
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Eustochomorpha Girault, with one described species, E. haeckeli Girault, from Australia is redescribed. Neotriadomerus Huber, gen. n., is described, together with seven new species, all from Australia: N. burwelli Huber, sp. n., N. crassus Huber, sp. n., N. darlingi Huber, sp. n., N. gloriosus Huber, sp. n., N. longiovipositor Huber, sp. n., N. longissimus Huber, sp. n. (one of the largest species of Mymaridae), and N. powerae Huber, sp._ n. Proarescon_ Huber, gen. n., is described for P. primitivum (Huber), comb. n., transferred from Borneomymar Huber, and P. similis Huber, sp. n., from Thailand. The previously unknown male of Borneomymar madagascar Huber is described and the genus is redescribed from critical point dried and slide mounted specimens. Triadomerini, stat. n., is proposed to include six genera: Borneomymar, Eustochomorpha and Neotriadomerus, and the Cretaceous Carpenteriana Yoshimoto, Macalpinia Yoshimoto and Triadomerus Yoshimoto. Aresconini is proposed to include five (possibly six) genera: Arescon Enock, Kikiki Huber and Beardsley, Proarescon Huber and Tinkerbella Huber and Noyes, and the Cretaceous Myanmymar Huber and, tentatively, also Enneagmus Yoshimoto. The two tribes are proposed as being the earliest lineages in Mymaridae, with Neotriadomerus and Triadomerus being sister genera to the remaining extant and extinct genera, respectively.
Plain Language Summary
The objective is to describe two new genera of Mymaridae (a group of parasitic wasps in eggs of other insects) and re-describe a third genus based on fresh material. The key findings are that the new genera and species represent the earliest lineages in the evolution of the family. One genus is hypothesized to be the most primitive mymarid known, occurs only in Australia and is represented there by at least seven species (all described as new in the paper). It is most closely related to a similar genus from almost 80 million year old Canadian Cretaceous amber. The other two genera are also early lineages of Mymaridae. Two tribes are defined to include these three genera, together with a few others, both extinct and living. The scientific impact is that their discovery, and description, will permit a better higher classification of Mymaridae to be developed.