Chordata: Class Sacropterygii

The second class of bony fish, the fleshy-finned fish, have thick fins with supporting bones. The only survivors of this group are the coelacanths, or lobefins, which have a vestigial lung, and the freshwater lungfishes of drought-ridden areas, which can crawl over land in search of water and even live out of water for several years. Early fleshy-finned fish gave rise to the first land vertebrates, the amphibians.

Sections in this article:

• Introduction
• Class Mammalia
• Class Aves
• Class Reptilia
• Class Amphibia
• Class Sacropterygii
• Class Actinopterygii
• Class Chondrichthyes
• Class Placodermi
• Classes Myxini and Hyperoartia
• Subphylum Vertebrata
• Subphylum Cephalochordata
• Subphylum Urochordata
• Bibliography

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