Facts about Lungfish

1. 07

   Closest living relatives of lungfish are tetrapods, placing them among the fish groups most closely related to land-dwelling vertebrates including humans.

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2. 06

   Lungfish eggs hatch into larval forms with external gills that gradually disappear as the young fish develop lungs over approximately 8 to 12 weeks of development.

   LungfishMay 14sharedevelopmentbiologyreproduction
3. 05

   Lungfish hearts contain three chambers rather than the two-chambered hearts of typical fish, representing an evolutionary intermediate step toward the four-chambered hearts of mammals and birds.

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4. 04

   African lungfish can generate electric fields up to 50 millivolts using specialized organs to navigate murky freshwater environments and locate prey.

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5. 03

   Lungfish possess primitive lungs derived from their swim bladders, allowing them to gulp air at the water surface and breathe oxygen directly like tetrapods do.

   LungfishMay 14shareanatomyrespirationevolution
6. 02

   The Australian lungfish has remained virtually unchanged for over 100 million years, making it a living fossil that predates the evolution of most modern fish species.

   LungfishMay 14shareevolutionancientbiology
7. 01

   Six species of lungfish can survive up to six years without water by encasing themselves in mucus cocoons and entering a dormant state called estivation.

   LungfishMay 14sharebiologysurvivaladaptation