| erection of ibirhynchus gen. nov. (acanthocephala: polymorphidae), based on molecular and morphological data. | the genus southwellina is composed of 3 described species, i.e., s. hispida (the type species), s. dimorpha, and s. macracanthus. all 3 are endoparasites of fish-eating birds that have worldwide distributions. morphologically, the genus is characterized by possessing a short and compact trunk, 2 fields of spines in the anterior region of the trunk (in at least 1 sex), a short cylindrical proboscis (sometimes with a swollen region armed with numerous longitudinal rows of hooks), a double-walled p ... | 2010 | 21348614 |