nephromixium
From ZooTerms (Dictionary of Invertebrate Zoology)
flame cells and coelomic funnel serving as both excretory and genital duct; a nephrogonoduct
nephromixium (noun; plural -ia; Greek nephros, kidney; mixis, mingling): An organ with
See also: protonephromixium, metanephromixium, mixonephridium.