observationd 11/12/2009

There were several new things i noticed in this weeks observation

-anabaena,euplotes, philodina, and a centropyxis.

Anabaena. These are filamentous and can often look like a coil or necklace of beads. The filaments are unbranched and can be straight, regularly or irregularly spirally twisted or twisted and intertwined(Lund 208).

Euplotes. These are a common and widespread hypotrich ciliate.

The adorall zone of membranelles draws a current of water under

the cell towards the cytosome(patterson 124).

Philodina. Philodina have a secretion used for anchoring to substrate temporarily by tips of toes or spurs. Adults usually stay attatched in one spot while newly hatched young may swim around actively before attaching to a substrate(Pennak 162). You can see in this video that the philodina stops all movement and closes up for a moment. This was a result of tapping on the aquarium, and could possibly be a way of protecting itself, although I am not positive.

Centropyxis.

Resources of information and identification;

Anabaena

Lund, John. 1995.Freshwater Algae. Hong Kong:Biopress Limited. p.208

Euplotes

Patterson, D.J..1996. Free-Living Freshwater Protozoa. Washington:ASM Press. p.124

Philodina

Pennak, Robert. 1953. Freshwater Invertabrates of the United States. New York. The Ronald Press Company. p. 162

Centropyxis

Hayden, F.V.. 1879. United States Geological Survey. Washington, Government Printing Office. Plate xxxI