Types of Annelids




Types of AnnelidsAnnelids have bodies that are split into segments. They have really well-developed inner organs.

Some annelids may have long bristles. Others have shorter bristles and seem smooth

You can find many types of worms. Commonly recognized worms include roundworms, earthworms and flatworms. Most worms are tiny, measuring fractions of an inch to several inches long. Other worms, including the ribbon worm, can develop up to 100 feet in length. Some worms are regarded as parasites, in that they live inside the human body.

Characteristics of Annelids

The annelids (also known as ringed worms), formally referred to as Annelida, are a big phylum of segmented worms, with more than 17,000 modern species such as earthworms, ragworms and leeches. They are present in marine environments from tidal areas to hydrothermal vents, in freshwater and in moist terrestrial surroundings.       

10 main characteristics of Annelida are given below:

Body has more than two cell layers, tissues and organs.

Bilaterally symmetrical and vermiform.

Body possesses a through gut with mouth and anus.

Body cavity is a true coelom, often divided by internal septa.

Has a nervous system with an anterior nerve ring, ganglia and a ventral nerve chord.

Body possesses 3 separate sections, a prosomium, a trunk and a pygidium.

Has no true respiratory organs.

Has a true closed circulatory system.

Troch phore lava is present during indirect development.

Reproduction normally sexual and gonochoristic or hermaphoditic.

Facts about Annelids

The earthworm is to us probably the most interesting of the Annelid worms. Adult Annelid worms range anywhere from 1/2 inch to 22 ft in length. Most earthworms are red brown or even pink. Earthworms can hatch as soon as two weeks in summer and so long as 3 months in the cold. Greater than 1 million earthworms can live on one acre of land at a time. 

10 facts on Annelid Worms

1. Adult annelid worms vary from >1/2 inch 22 ft.

2. Earth worms consume the leaves and turn it into soil

3. Earth worms lack eyes however are light sensitive

4. Earth worms can live underwater for some time

5. Earth worms can detect the motion of a robin

6. Earth worms require moist soil to live

7. Have been kept alive for 6 years, but just 2 in the wild

8. Can survive being frozen if not froze to quickly

9. Dont surface to prevent drowning but to find a mate.

10. They inhale through their skin.





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