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    A self-fertile species of Steinernema from Indonesia: further evidence of convergent evolution amongst entomopathogenic nematodes?


    Griffin, Christine and O'Callaghan, K.M. and Dix, I. (2001) A self-fertile species of Steinernema from Indonesia: further evidence of convergent evolution amongst entomopathogenic nematodes? Parasitology, 122. pp. 181-186. ISSN 0031-1820

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    Abstract

    More than 20 species of the entomopathogenic nematode Steinernema have been described; to date, all reproduce exclusively by cross-fertilization of male and female individuals. Steinernema sp. strain T87 from Indonesia was found to consist largely of self-fertile hermaphrodites. Progeny were produced by morphological females both in insects (Galleria mellonella) and in hanging drops of insect haemolymph inoculated with a single infective juvenile. Sperm were present in the oviduct of unmated morphological females. Approximately 1% of infective juveniles developed into males, and males were also present in the second generation where they constituted 1–6% of the population. Under the same conditions the related species Steinernema longicaudum strain CB2B displayed typical steinernematid reproduction: crossfertilization and a 1:1 sex ratio. It is argued that the development of hermaphroditism in Steinernema sp. T87 represents convergent evolution with Heterorhabditis, the other major genus of entomopathogenic nematode.

    Item Type: Article
    Keywords: evolution; hermaphrodite; nematode; reproduction; self-fertilization; sex determination;
    Academic Unit: Faculty of Science and Engineering > Biology
    Item ID: 7545
    Identification Number: https://doi.org/10.1017/S003118200100717X
    Depositing User: Dr. Christine Griffin
    Date Deposited: 19 Oct 2016 14:44
    Journal or Publication Title: Parasitology
    Publisher: Cambridge University Press
    Refereed: Yes
    URI:

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