Light Exposure on the Regeneration of Dugesia Dorotocephala

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Light exposure on the regeneration of Dugesia dorotocephala

Introduction

The objective of this experiment was to test the effect of light exposure on the regeneration of Dugesia dorotocephala. Dorotocephala is a species which belongs to the kingdom Animalia, class Turbellaria, order Seriata, these worms are classified in the suborder Tricladida based on the three main branches of their digestive system. They are further subdivided based upon ecological habitat. They come in freshwater, marine and terrestrial forms (Alvarado, Reddien). they belong to the family Planariidae and genus Dugesia. These creatures display bilateral symmetry and are classified as metazoans (eumetazoans). Dugesia are found in freshwater habitats in various regions of the world. They inhabit places in Africa, the Middle East, Europe, Asia and even parts of Australia. These small animals tend to be elongated with a triangular head. They possess a dorsal surface coated in shades of grey, black and brown, and a ventral which is a paler shade than the dorsal side. In general they are small and soft bodied which allows them to hide in tight spaces. They are classified as free living and lack a coelom, a hemal system and a circulatory system. Because of this many of their functions depend on diffusion. Freshwater turbellarians are benthic inhabitants of lakes, ponds, springs and streams. Their bodies are covered with cilia and they possess a syncytial epidermis. These small animals lack appendages and rely on cilia to glide over surfaces.

Unlike other worms these freshwater flatworms are unsegmented. They are acoelomates, meaning that they lack a coelom or a complete gut cavity. Their demonstration of bilateral symmetry has been linked directly to cephaliza...

... middle of paper ...

...neration in Planaria." Encyclopedia of Life Sciences (2001): n. pag. National Center for Biotechnology Information. U.S. National Library of Medicine, N.d. Web. 18 Mar. 2014. .

"Planaria: A Window on Regeneration." Exploratorium.edu. The Exploratorium, n.d. Web. 18 Mar. 2014. .

"Planaria Regeneration Activity." Hhmi.org. BioInteractive, 2004. Web. 18 Mar. 2014. .

Zhenghou, Henan. "Identification of Small Non-coding RNAs in the Planarian Dugesia Japonica via Deep Sequencing." National Center for Biotechnology Information. U.S. National Library of Medicine, 8 Mar. 2012. Web. 18 Mar. 2014. .

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