Сообщество, посвящённое ра - Pharyngolepis
September 13th, 2011
08:32 pm
[industrialterro]

[Link]

Previous Entry Add to Memories Tell A Friend Next Entry
Pharyngolepis

 Pharyngolepis is an extinct genus of primitive jawless fish that lived in the Silurian period of what is now Norway.

 Pharyngolepis had well-developed anal an caudal fins, but no paired or dorsal fins that would have helped stabilise it in the water, and so was probably a poor swimmer, remaining close to the sea bottom. The pectoral fins were instead replaced by bony spines, possibly for protection against predators, and there was a row of spines along the back. It probably scooped up food from the ocean floor.

 

 Репродукции (1, 2, 3):

 

 

 

 

 

 

 Ископаемые останки:

 

 

 

 

Tags: ,

(Leave a comment)

Powered by LJ.Rossia.org