S. Patricia Stock, James F. Campbell, Steven A. Nadler, Phylogeny of Steinernema Travassos, 1927 (Cephalobina: Steinernematidae) Inferred from Ribosomal DNA Sequences and Morphological Characters, The Journal of Parasitology, Vol. 87, No. 4 (Aug., 2001), pp. 877-889
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Stock et al. (2001) studied this question.
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