A recent evolutionary framework of the Nematoda based on 18S ribosomal DNA sequence analysis (Blaxter et al., 1998) supports Poinar’s hypothesis, suggesting invertebrate parasitism arose independently at least four times (Dorris et al., 1999) (Fig. 1)
A recent evolutionaryframework of the Nematoda based on 18S ribosomalDNA sequence analysis (Blaxter et al., 1998) supportsPoinar’s hypothesis, suggesting invertebrate parasitismarose independently at least four times (Dorris et al.,1999) (Fig. 1)