Recently, molecular techniques, utilising the ribosomal (18S or ITS)
or mitochondrial (cox1) regions as genetic markers, have proved to beparticularly useful for the exact discrimination and identification of
cucullanid nematodes at the species level [12,26,58,59]. In the present
study, there was no nucleotide difference detected in the 18S and ITS
rDNA among the different individuals of C. extraneus n. sp. examined
herein.