Body of adult females is made of tissue and is covered with a thin cuticle devoid of calcareous plates, traces of segmentation, distinct regions, appendages, or an alimentary tract. The body consists of a central nucleus, which attaches itself onto the mid-gut of the host from where it sends root-like appendages (the interna) into every part of the host's body. This nucleus connects to the exterior of the host with the external knob sac (the externa). Males are dwarves, microscopic cyprids that attach to females.
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