
1) Barramunda 2) Barramundi 3) Ceratodus 
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https://www.crosswordclues.com/clue/lungfish

1) Bony fish 2) Dipnoan 3) Fish 4) Living fossil 
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https://www.crosswordclues.com/clue/lungfish

 Lungfish (also known as salamanderfish) are freshwater fish belonging to the subclass Dipnoi. Lungfish are best known for retaining characteristics primitive within the Osteichthyes, including the ability to breathe air, and structures primitive within Sarcopterygii, including the presence of lobed fins with a well-developed internal skeleton. Tod...
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http://en.wikipedia.org/wiki/Lungfish

• (n.) Any fish belonging to the Dipnoi; -- so called because they have both lungs and gills.
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http://thinkexist.com/dictionary/meaning/lungfish/

any of six species (three species according to some authorities) of air-breathing fishes placed with a number of extinct forms in the subclass Dipnoi ... [10 related articles]
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http://www.britannica.com/eb/a-z/l/84
 Lung'fish`  noun  (Zoology)
Lung'fish`  noun  (Zoology) Any fish belonging to the Dipnoi; -- so called because they have both lungs and gills. 
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http://www.encyclo.co.uk/webster/L/69

[
n] - air-breathing fish having an elongated body and fleshy paired fins
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http://www.webdictionary.co.uk/definition.php?query=lungfish
 noun
 noun air-breathing fish having an elongated body and fleshy paired fins; certain species construct mucus-lined mud coverings in which to survive drought
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https://www.encyclo.co.uk/local/20974

Any of a group of fleshy-finned bony fishes found in South America, Australia, and Africa. They have elongated bodies, and grow to about 2 m/6 ft, and in addition to gills have `lungs` with which they can breathe air during periods of drought conditions. (Genera 
Lepidosiren...Found on 
https://www.encyclo.co.uk/local/21221

A type of lobe-finned fish that breathe by a modified swim bladder (or lung) as well as by gills.
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https://www.encyclo.co.uk/local/21571

any of various slender, air-breathing fishes of the order (or subclass) Dipnoi, of rivers and lakes in Africa, South America, and Australia, having a lunglike air bladder as well as gills and growing to a length of 3 to 6 ft. (0.9 to 1.8 m).
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https://www.infoplease.com/dictionary/lungfish
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