long, with ventral post-cerebral mouth opening; pharynx directed [slanted] caudally; no tail-plate (no adhesive plate); rhammite tracts pass through brain; male organ with a simple stylet which protrudes anteriorly into a large male antrum; male antrum divided into proximal glandular and distal ciliated sections; female canal either completely lacking or only briefly developed at maturity; vesicula granulorum with 2 types of secretions; cement glands arranged in a wide circle around male opening; testis and ovary unpaired; lateral longitudinal nerve trunks numerous (~25), lying caudally outside the circular muscles; only brain and tail ganglia insunk
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