Classification:
Phylum: Rotifera
Class: Bdelloidea
Scientific Name: Philodina gregaria
Class: Bdelloidea
Scientific Name: Philodina gregaria
General Characteristics:
Philodina gregaria is one of the most frequently encountered rotifer species. It is relatively large for the Rotifera phylum and it is easily observed through a microscope. They are bilaterally symmetrical organisms that have more than two cell layers as well as tissues and organs. They are pseudocoelomates and possess a gut with an anus. Covering the body is an external layer of chitin referred to as lorica. The nervous system is comprised of a brain and paired nerves. Respiration is carried out through simple diffusion. Reproduction is mostly parthenogenic. They prey on largely on algae.
Habitat:
Philodina gregaria are native to the Antarctic were they can survive for long periods in a frozen state. During the summer months, they can be found in such large aggregations that the bottoms of lakes and pools may appear a rusty red color.
Importance to Humans:
Philodina gregaria are easily observed under a microscope due to their translucent body and large size. They are subject to various studies investigating rotifera behavior and anatomy.
Sources:
"Rotifers: The Bdelloid Rotifers. Anatomy,, using Philodina species". Micrographia. Retrieved from: http://www.micrographia.com/specbiol/rotife/homebdel/bdel01ph.htm.