obsolete_gill true Compound organ that consists of gill filaments, gill lamellae, gill rakers and pharyngeal arches 3-7. The gills are responsible for primary gas exchange between the blood and the surrounding water. true MAT:0000134 http://purl.obolibrary.org/obo/UBERON_0011150 MFO:0003180 James Malone XAO:0000120 use : http://purl.obolibrary.org/obo/UBERON_0011150 label : pharyngeal arch derived gill branchia A paired respiratory organ in fishes consisting of gill filaments on the gill arch in the posterior portion of the head and usually providing the primary exchange of gases between the blood and the surrounding water. BTO:0000518 gills ZFA:0000354 2.61 Catherine Leroy external gill TAO:0000354