“…However, the true species diversity in this phylum is masked by the phenomenon of cryptic speciation. Molecular systematics have suggested that each of the following taxa are complexes of two or more reproductively isolated, sibling species: Acanthocephaloides propinquus (Dujardin, 1845) Meyer, 1932 (see Buron et al, 1986), Echinorhynchus gadi Zoega in Müller, 1776 (see Väinölä et al, 1994), E. bothniensis Zdzitowiecki & Valtonen, 1987(see Väinölä et al, 1994, Leptorhynchoides thecatus (Linton, 1891) Kostylew, 1924 (see Steinauer et al, 2007) and Neoechinorhynchus golvani Salgado-Maldonado, 1978 (see Martínez-Aquino et al, 2009). Once dissected by molecular markers, the members of these species complexes are sometimes found to be distinguished by subtle morphometric differences (Buron et al, 1986;Wayland et al, 2005).…”