Studies on the ultrastructure and function of a primitive excretory organ, the protonephridium of the rotifer asplanchna priodonta.
D000818:Animals; D001826:Body Fluids / Q000378:metabolism*; D007684:Kidney Tubules / Q000166:cytology; D008854:Microscopy, Electron; D009348:Nematoda / Q000033:anatomy & histology / Q000166:cytology* / Q000502:physiology