English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

The acanthocephalan genus    Echinorhynchus    Zoega in Müller, 1776 ( sensu  Yamaguti 1963 ) is a large and widespread group of parasites of teleost fish and malacostracan crustaceans, distributed from the Arctic to the Antarctic in habitats ranging from freshwaters to the deep-sea. A total of 52 species are currently recognised based on the conventional morphological species concept; however, the true diversity in the genus is masked by cryptic speciation. The considerable diversity within    Echinorhynchus    is an argument for subdividing the genus if monophyletic groups with supporting morphological characters can be identified. With this objective in mind, partial sequences of two genes with different rates of evolution and patterns of inheritance (nuclear 28S rRNA and mitochondrial cytochrome c oxidase subunit I) were used to infer the phylogenetic relationships among eight taxa of    Echinorhynchus   . These included representatives of each of three genus group taxa proposed in a controversial revision of the genus based on cement gland pattern, namely    Echinorhynchus    ( sensu stricto ),    Metechinorhynchus    Petrochenko, 1956 and    Pseudoechinorhynchus    Petrochenko, 1956. These groupings have previously been rejected by some authorities, because the diagnostic character is poorly defined; this study shows that    Echinorhynchus    ( sensu stricto ) and    Metechinorhynchus    are not natural, monophyletic groups. A revision of    Echinorhynchus    will require tandem molecular phylogenetic and morphological analyses of a larger sample of taxa, but this study has identified two morhological characters that might potentially be used to define new genera. The estimated phylogeny also provides insight into the zoogeographical history of    Echinorhynchus    spp. We postulate that the ancestral    Echinorhynchus    had a freshwater origin and the genus subsequently invaded the sea, probably several times. The freshwater taxa of the    E.   bothniensis    Zdzitowiecki &amp; Valtonen, 1987 clade may represent a reinvasion of freshwater by one or more ancestral marine species.

zookeys

The systematics of    Echinorhynchus    Zoega in Müller, 1776 (  Acanthocephala  ,   Echinorhynchidae  ) elucidated by nuclear and mitochondrial sequence data from eight European taxa