Subclass Sarcopterygii Sign Video
No video uploaded yet.
Definition
Ray-finned fishes evolved during the Devonian period, along with another major lineage of osteichthyans, the lobe-fins. The kay derived character of lobe-fins is the presence of rod-shaped bones surrounded by a thick layer of muscle in their pectoral and pelvic fins. During the Devonian, many lobe-fins lived in brackish waters, such as in coastal wetlands. There they probably used their lobed fins to swim and "walk" underwater across the substrate. Some Devonian lobe-fins were gigantic predators. It is not uncommon to find spike-shaped fossils of Devonian love-fins teeth as big as your thumb.
Source: Campbell, Neil A., & Reece, Jane B. Biology (7th edition), 2005.
Other Submissions
BROWSE
All
> Science
> Natural Science
> Organisms
> Animalia Kingdom
> Vertebrates
> Pisces
> Class Osteichthyes
> Subclass Sarcopterygii
* video needed
click here to zoom in