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:	https://www.cambridge.org
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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