Department of Integrative Biology

Parasitylenchus nearcticus sp. n. (Tylenchida: Allantonematidae) is described as a parasite of Drosophila recens (Diptera : Drosophilidae) collected from the Adirondack Mountains in New York State, USA. The new species is compared to the single previously known species of Parasitylenchus from Great Britain and a key to the allantonematid parasites of Drosophilidae is presented. The females of the two parasitic generations show dimorphism in regards to the form of the styler and pharyngeal glands. P. nearcticus n.sp. sterilizes females of D. recens, thus having an effect on the population ecology of this host.