6) write distribution of Lungfishes with
suitable example in zoological names (3M)
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Answer:
Lungfish are freshwater rhipidistian fish belonging to the order[1] Dipnoi. Lungfish are best known for retaining primitive characteristics within the Osteichthyes, including the ability to breathe air, and primitive structures within Sarcopterygii, including the presence of lobed fins with a well-developed internal skeletonToday there are only six known species of lungfish, living in Africa, South America, and Australia. The fossil record shows that lungfish were abundant since the Triassic.[2] While vicariance would suggest this represents an ancient distribution limited to the Mesozoic supercontinent Gondwana, the fossil record suggests advanced lungfish had a widespread freshwater distribution and the current distribution of modern lungfish species reflects extinction of many lineages subsequent to the breakup of Pangaea, Gondwana and Laurasia. Lungfish have historically been referred to as salamanderfish,[