“Dipnoi”的概念、定义、翻译、参考文献-科学参考

Dipnoi

Biology

A subclass or order of bony fishes that contains the lungfishes, which have lungs and breathe air. They are found in Africa, Australia, and South America, where they live in freshwater lakes and marshes that tend to become stagnant or even dry up in summer. They survive in these conditions by burrowing into the mud, leaving a small hole for breathing air, and entering a state of aestivation, in which they can remain for six months or more. The Dipnoi date from the Devonian era (416–360 million years ago) and share many features with the modern Amphibia.

Geology and Earth Sciences

Literally, ‘double breathing’. Often ranked as a subclass, the group includes the extant lung-fish and their fossil relatives (e.g. the Middle Devonian Dipterus and the Triassic Ceratodus). Early forms have an elongated body, a well-ossified internal skeleton, heterocercal tail, fleshy-lobed fins, and cosmoid scales. Teeth are absent, but one of the commonest fossils is the broad fan-shaped tooth plate that served for shearing and crushing small invertebrates. Dipnoans first appear in Lower Devonian rocks and were common in freshwater habitats in the late Palaeozoic and the Triassic; thereafter their fossil remains are very sparse. There are just three surviving genera (Neoceratodus, Protopterus, and Lepidosiren), all tropical.

单词	Dipnoi
释义	Dipnoi Biology A subclass or order of bony fishes that contains the lungfishes, which have lungs and breathe air. They are found in Africa, Australia, and South America, where they live in freshwater lakes and marshes that tend to become stagnant or even dry up in summer. They survive in these conditions by burrowing into the mud, leaving a small hole for breathing air, and entering a state of aestivation, in which they can remain for six months or more. The Dipnoi date from the Devonian era (416–360 million years ago) and share many features with the modern Amphibia. Geology and Earth Sciences Literally, ‘double breathing’. Often ranked as a subclass, the group includes the extant lung-fish and their fossil relatives (e.g. the Middle Devonian Dipterus and the Triassic Ceratodus). Early forms have an elongated body, a well-ossified internal skeleton, heterocercal tail, fleshy-lobed fins, and cosmoid scales. Teeth are absent, but one of the commonest fossils is the broad fan-shaped tooth plate that served for shearing and crushing small invertebrates. Dipnoans first appear in Lower Devonian rocks and were common in freshwater habitats in the late Palaeozoic and the Triassic; thereafter their fossil remains are very sparse. There are just three surviving genera (Neoceratodus, Protopterus, and Lepidosiren), all tropical.
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