Mouth near front end of body; pharynx barrel-shaped, slanting obliquely forward; testes dorsal to vitellaria, which are strongly branched and frequently anastomosing with one another; vitellaria whose branches spread out ramifications also dorsal over the testes; genital opening in front of mid-body; ejaculatory duct [male copulatory organ] in form of cirrus, often armed with minute spines; with genito-intestinal connection; antrum with pyriform lobes; no dermal rhabdites; protonephridia with separate openings; with rhammite tracts;
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