Rodent Parasite (Often Tapeworm Segment or Tissue)

Intestinal tract of rodents (rats, mice) and occasionally humans; expelled in feces into household environments.

Absorbs nutrients directly from the host's intestinal contents; lacks a digestive system of its own.

Parasitic life cycle usually involving an intermediate host (like beetles or fleas) for H. diminuta, though H. nana can be directly transmitted. Segments (proglottids) break off and are passed in stool.

Pathogenic parasite. Can cause Hymenolepiasis in humans, leading to abdominal pain, diarrhea, and nausea. No benefits; indicates a rodent infestation.