Annelids

Author: Elle Rauch
__**EXAMPLES**__: leeches earthworms

__**HABITAT**__: Annelids live typically in either fresh water, salt water, or muddy soil. Earthworms, a common annelid, live in environments ranging from semiarid habitats to moist, well-vegetated areas. They are typically round in wet areas like soil, leaf litter and under rocks and logs. After a heavy rain, many are found on the surface due to waterlogged soil.

__**TYPE OF COELOM:**__ The body cavity is a fluid-filled true coelom. It is well developed and often divided by internal septa.

Annelids do not have either. They are soft bodied organisms.
 * __ENDOSKELETON or EXOSKELETON__:**

They have a nervous system which includes an anterior nerve ring, ganglia and a ventral nerve chord. They also contain nerves in each segment.
 * __TYPE OF NERVOUS SYSTEM__:**

__**FEEDER**__: Some annelids are filter feeders that have tentacles which filter food from water. They feed on a wide range of material.

__**SYMMETRY**__: Annelids are bilaterally symmetrical. example of bilateral symmetry.

__**REPRODUCTION**__: The reproduction of annelids is normally sexual. More specifically, it is either gonochoristic or hermaphoditic reproduction. They exchange sperm and their embryos develop externally.

__**CIRCULATORY SYSTEM**__: They have a closed circulatory system. example of the circulatory system of an annelid.

__**ENDOTHERMIC or EXOTHERMIC**__. Annelids are exothermic. This means they rely on their environment as a source of heat, or they are cold-blooded.

__**SEGMENTATION**__: Annelids are composed of many identical segments. There bodies have 3 separate sections, a prosomium, a trunk and a pygidium. An earthworm, a very common annelid, has a segmented nervous, excretory, and circulatory system.

__**WORKS CITED**__: // Worm //. Digital image. // Circulatory System //. Web. 29 Mar. 2011. . // Butterfly //. Digital image. // Bilateral Symmetry //. Web. 29 Mar. 2011. . // Earthworms //. Digital image. // Earthworms Close-up //. Web. 29 Mar. 2011. . Leech, // The Social Media Leech //. Digital image. // The Harte of Marketing //. Web. 29 Mar. 2011. . "The Annelids (Phylum Annelida)." // The Earth Life Web //. Web. 29 Mar. 2011. .

I'm sorry, I know this is really bad but an hour of my work on this got deleted somehow.