Volvox

© 2000 by Image Quest 3-D
Read our copyright notice

 

These are spherical colonies of green algae, phylum Chlorophyta. This genus, Volvox, has colonies comprising in excess of 500 small, green, bi-flagellate cells more or less equally spaced on the surface of a hollow globe of mucilage. Large colonies may exceed 1 mm in diameter. They are frequent in still or slow flowing freshwaters. Volvox is one of the most beautiful objects to be found in freshwater and is large enough to be easily visible to the naked eye.

Its ability to reproduce asexually is well documented and usually a culture of Volvox will adequately demonstrate that most larger colonies have daughter colonies developing within. Many textbooks will mention that even these daughters propagate grand-daughters inside, before even they themselves are borne - such an event is seldom seen. In really ripe, mature colonies the daughters swim free within the lumen of the parent, spinning on variable axes as the parent spins independently on its own axis. Very occasionally the grand-daughters swim free and then the viewer is presented with a true miracle of movement (see above).

 

Click here to view the 'Picture of the Week' archive.

 

 

 
 
For Terrestrial Images visit our sister library by clicking on the flower below.
Click here to go to the Terrestrial Stock Photo Library Start Page.
 
2001 by Image Quest 3-D
Read our copyright notice
Click here to go to the Marine Stock Photo Library Start Page.