in taxon Arthropoda Malpighian tubule A tubule that extends from the posterior part of the digestive tract which absorbs solutes, water, and wastes from the surrounding hemolymph. Each tubule consists of a single layer of cells that is closed off at the distal end with the proximal end joining the alimentary canal at the junction between the midgut and hindgut[WP,modified]. Wikipedia:Malpighian_tubule BTO:0000810 TGMA:0001038 Malphigian tube UBERON:0001054 MAT:0000123 tuba Malpighii MESH:D008317 GAID:1228 FBbt:00005786 It is unclear as to whether the Malpighian tubules of arachnids and those of the Uniramia are homologous or the result of convergent evolution.[Wikipedia:Malpighian_tubule_system] EFO:0000243 EDITOR_NOTE this will be ceded to the Arthropod Anatomy Ontology SCTID:41055008 MIAA:0000123 TADS:0000163 Malpighian tube renal tubule