Major Achievements
In der Beschränkung zeigt sich erst der Meister Goethe Natur und Kunst- Contributions to the species concept by the designation of type specimens which would be suitably housed. This was suggested in a letter to the Entomological Magazine in 1833 and the idea was approved by the editor, Francis Walker.
- Contributions to the concept of synonymy.
- Establishing rules for systematics and nomenclature, Haliday's refined analysis of the history of names and the natural groupings the names identified was a model of perfection and the rules Haliday suggested were taken up by all important continental and most British authors.
- Haliday's description of the genus Orphnephila (Diptera: Thaumalaeidae)and the accompanying plate set a new standard of descriptive taxonomy far in advance of anything of its time.
- Halidays Essay on the classification of parasitic Hymenoptera is a seminal work of higher taxonomy.He was one of the pioneers of the group. Others were Johann Ludwig Christian Gravenhorst, Arnold Förster (also Förster) and Nees von Essenbeck. The higher classification of the ichneumons is unstable but many of Halidays higher taxa have survived.
- Haliday was a specialist, working full-time on Diptera in the families Sphaeroceridae and Dolichopodidae and on the Hymenoptera and Thysanoptera (excepting the arena of synonymy)
Read more about this topic: Alexander Henry Haliday
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