The Protopterus, but not the Neoceratodus, type of these sarcopterygians engages in estivation by creating a cocoon of mucus and burying itself in mud.
Erik Jarvik reclassified these organisms as members of the less-complex holocephalians after examining the premaxillary bones of their skull roofs. The male members of the Lepidosiren genus of these animals develop vascularized filaments in their pelvic appendages so that they provide oxygen to their eggs. The Protopterus, but not the Neoceratodus, type of these sarcopterygians engages in estivation by creating a cocoon of mucus and burying itself in mud. The "marbled" African type of these animals has the largest known animal genome, while the South American type of these so-called "living fossils" possess two of the namesake structures, which it uses in place of gills during certain times of the year. For 10 points, name these most primitive living fish, which are able to sustain themselves by consuming oxygen from air.
Erik Jarvik reclassified these organisms as members of the less-complex holocephalians after examining the premaxillary bones of their skull roofs.
lungfish [or salamanderfish; or dipnoi; or barramunda]