with adhesive papillae strewn over entire body; without eyes; intestine mostly with an intestinal muscle (except, perhaps, M arcassonensis) and reaching caudally over gonopore; with caudal sensory organ; testis and ovary unpaired; penis stylet mostly very complicated through distal folding; less, however, with clear thickening; with accessory gland organ and gland stylet; gland stylet solid, thick-walled, with a proximal compact part with indentations for attachment of muscle fibers; mouthpiece long, with small thickening through its entire length; mid-piece flat to needle-shaped, simply formed;
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