With a proboscis derived from a terminal invagination of the body wall; with numerous erythrophilous proboscis glands (modified rhabdites); with dermal and adenal rhabdites. Pharynx in posterior part of body and pointing caudoventrally; pharyngeal cavity poorly developed; without a typical Greifwulst, instead divided into a proximal and distal region by a circular groove at about mid-pharynx; nuclei of inner pharynx epithelium restricted to the circular groove; pharynx glands open in two clearly separated girdles in the distal region; with a distinct esophagus and a circle of granular clubs around the Darmund. With a single gonopore and a genital atrium in the posterior part of the body; testes paired; a single seminal vesicle not separated from the prostatic vesicle forming a copulatory bulbus with the latter; sometimes with penis papilla or stylet in the form of a cuticularized lining of the male genital canal. Female gonad paired germovitellaria, with the germaria situated at the caudal end; generally only one connection between female gonad and genital atrium functioning as efferent duct of the gonad as well as a bursal organ; this female genital canal divided by a constriction into a distal region--a simple invagination of the atrium wall--functioning as bursal organ, and a proximal glandular region; Opening of the excretory system unknown.
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