Lepidosiren, [511], [149], [153], [261], [401];

pectoral fins, [157];

skull, [231], [233];

gills, [286];

larval gills, [291], [517], [518];

lung, [291], [301];

vascular system, [527];

thyroid, [344];

growling sounds, [363];

relations with other Dipnoi, [518], [519];