As the names suggest, the subdivision of annelids into the Errantia and Sedentaria matches their overall lifestyles (Fig. 1). Members of the Errantia are free to move about, and crawl, swim or burrow.
A team of researchers from the European Molecular Biology Laboratory in Germany and the University of Exeter in the U.K. has conducted the first comprehensive study of the head chemosensory organ ...
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