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Echinorhynchus   truttae    and the    Echinorhynchus   bothniensis    species complex are common parasites of salmoniform and other fishes in northern Europe.    Echinorhynchus   bothniensis    and its sibling species    Echinorhynchus  \' bothniensis \'   are thought to be closely related to the Nearctic    Echinorhynchus   leidyi    Van Cleave, 1924 based on morphological similarity and common usage of a mysid intermediate host. This study provides the first analysis of morphological and meristic variation in    Echinorhynchus   truttae    and expands our knowledge of anatomical variability in the    Echinorhynchus   bothniensis    group. Morphological variability in    Echinorhynchus   truttae    was found to be far greater than previously reported, with part of the variance attributable to sexual dimorphism.    Echinorhynchus   truttae   , the two species of the    Echinorhynchus   bothniensis    group and    Echinorhynchus   leidyi    displayed considerable interspecific overlap in the ranges of all conventional morphological characters. However,  Proboscis profiler , a tool for detecting acanthocephalan morphotypes using multivariate analysis of hook morphometrics, successfully separated    Echinorhynchus   truttae    from the other taxa. The    Echinorhynchus   bothniensis    species group could not be reliably distinguished from    Echinorhynchus   leidyi    (or each other), providing further evidence of the affinity of these taxa. Observations on the distribution of    Echinorhynchus   truttae    in its definitive host population are also reported.

biodiversity data journal

Morphological variation in    Echinorhynchus   truttae    Schrank, 1788 and the    Echinorhynchus   bothniensis    Zdzitowiecki &amp; Valtonen, 1987 species complex from freshwater fishes of northern Europe