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Diversity And Ecology Of Annelids 10/B (Class Hirudinea (Leeches) (Ecology…
Diversity And Ecology Of Annelids 10/B
Class Polychaeta
.
Polychaetes live mainly in the oceans.
They have well-developed sense organs, including eyes.
Each segment has a pair of parapodia—appendages for swimming and crawling.
Fan worms are filter feeders, they trap food in the mucus of their fans.
Include Bristle and Fanworms.
Ecology
.
Polychaetes help change organic matter on the ocean into carbon.
Plant plankton use the carbon dioxide for photosynthesis.
Polychaetes also serve as an important food source to many animals.
Class Oligochaeta
Ex. Earthworms.
They ingest soil to extract nutrients.
By this way they aerate the soil, which means that they break it up to allow air and water to pass through it.
Includes Tubifex and Lumbriculid worms
Tubifex worms are threadlike aquatic annelids that are common in areas of high pollution.
Lumbriculid worms are freshwater annelids.
Used as bait for fishing and live in ground soil.
Ecology
Many animals eat earthworms.
Beneficial to plants because they aerate the soil and allow water to reach the plant efficiently.
They are harmful because they consume leaf litter in soil which removes other animal's shelter.
Class Hirudinea (Leeches)
Most live in freshwater, steams, or rivers where they attach to the bodies of their hosts.
They attach using front and rear suckers.
External parasites with flattened bodies and usually have no setae.
When they bite their saliva contains chemicals that act as an anesthetic.
Ecology
Are beneficial and used as medical treatments after microsurgical procedure to prevent blood from accumulating in the surgical areas.
Sometimes they can cause bacterial infections.
Alya Almanea
Nouf Alhedeithy
Aljohara Tawfiq
