Diagnosis. Living specimens with rounded anterior body and enlarged posterior body end. Integument coloration whitish. A pair of very short transverse cephalic slits present. Longitudinal musculature of the body wall with an internal layer of zigzag-shaped myofibrils. Rhynchodaeum epithelium dominated by granular acidophilic glands, which are also abundant near the rhynchopore; basophilic agranular glands are also present in the rhynchodaeum epithelium. Muscular proboscis wall thin, with an outer layer of longitudinal muscles and an inner layer of circular muscles; proboscis epithelium with nematocysts. Rhynchocoel extending for 0.80–0.95 of the body length. Longitudinal myofilaments absent between gut and rhynchocoel. Buccal nerves initially joined (but not fused completely), but, as they approach mouth, they diverge from each other, forming nerve plexuses here and there. Foregut entirely enveloped by vascular plexus. Dorsal vessel protrudes into rhynchocoel at the foregut level. Brain with one dorsal commissure and one ventral commissure.
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