Hatschek's nephridium
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http://purl.obolibrary.org/obo/UBERON_0009866
An unpaired kidney whose duct opens into the anterior pharynx. It can be seen as a deep ciliated fossa on the dorsal midline of the buccal cavity (mouth). Among other things, it secrets mucus which entraps food particles from the water[WP]. [ http://orcid.org/0000-0002-6601-2165 ]