Annelida are segmented worms found worldwide in marine sediments, soils, and yards. They have bilateral symmetry, eukaryotic cells, and more than two cell layers. Their body is described as an inner digestive tract separated from an outer body wall by a coelom. There are three main types: polychaetes which are marine with many bristles on each segment; earthworms which live in soil and have a straight digestive system; and leeches which lack bristles and have dense connective tissue filling their coelom.

1. Annelida(segmented worms)
Biology Project

2. Introduction
• In this presentation we will explain you about
Annelida and the 3 major types of annelids
1) Polychaeta
2) Earthworms
3) leeches

3. What is Annelida?
• Annelida is a group commonly referred to as
segmented worms, and they are found
worldwide from the deepest marine
sediments to the soils in our city parks and
yards.

4. Characteristics of Annelida
• Bilaterally symmetrical and vermiform
• They are eukaryotic cells
• Body has more than two cell layers, tissues
and organs.
• Has no true respiratory organs

5. External features
• The body of an annelid is often described as a
tube within a tube. The inner tube, or
digestive tract, is separated from the outer
tube, or body wall, by the coelom. The head
region followed by a series of segments similar
to each other in appearance.

6. Types of Annelida-Polychaeta
• The Polychaeta or polychaetes are a class
of annelid worms, generally marine. Each
body segment has a pair of flesh
called parapodia that bear many bristles
which are made of chitin. Indeed, polychaetes
are sometimes referred to as bristle worms.

7. Types of Annelida-Earthworms
• An earthworm is a tube-shaped, segmented
animal that is commonly found living in soil.
Its digestive system runs straight through its
body, it conducts respiration through the
cuticle covering its skin, and it has a
simple, closed blood circulatory system

8. Types of Annelida-leeches
• Leeches are segmented worms that belong to
the phylum Annelida leeches do not have
bristles and the external segmentation. Their
bodies are much more solid as the spaces in
their coelom are dense with connective
tissues.

9. BY-ADNAN AND MUGUNTHAN
Thankyou