Front end not pointed, ciliated epithelium with regular rhabdite border and post-oral glands; 4 eyes (or zero); Pharynx large (1/4-1/3 or more of body length) of projected barrel-shape; genital opening perhaps at boundary of 2nd and 3rd body thirds; testes large in middle body third; with thin walled seminal vesicle (unpaired); copulatory organ containing proximal prostatic vesicle and distal cuticular organ, which consists of surrounding ring or cylinder and [concentric] surrounding circle of spines; free-living;
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