Annelida(segmented worms)

Biology Project

Introduction

• In this presentation we will explain you about Annelida and the 3 major types of annelids

1) Polychaeta2) Earthworms3) leeches

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.

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

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.

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.

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

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.

BY-ADNAN AND MUGUNTHAN

Thankyou