Mouth opening in hind body half; pharynx ventro-caudal, very movable and of appearance similar to plicatus; strongly developed extrapharyngeal glands; opening of male and female canals through a common unpaired genital pore caudal to the mouth or in the oral tube; testes paired and generally joined frontally by a bridge; male copulatory organ with unpaired seminal vesicle and intracapsualar prostatic glands; ejaculatory duct of cirrus type, spined or not spined; without stylet apparatus; paired vitellaria and separate paired or unpaired germaria; mostly marine;
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