One example of animals having a single opening to the outside that serves both as mouth as well as anus is:
Phylum Platyhelminthes (Flat Worms) -
Free living, commensal or parasite with dorsoventrally flattened body, bilaterally symmetrical, triploblastic and acoelomate.
Eg. Taenia, Fasciola
Fasclola (Platyhelminthea) has single opening for both ingestion and excretion
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