Phylum Annelida: Segmented Worms. Section 27.2 Summary – pages Segmented worms are classified in the phylum Annelida. They include leeches and. - ppt download

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Section 27.2 Summary – pages The basic body plan of segmented worms is a tube within a tube. The internal tube, suspended within the coelom, is the digestive tract. Body Structure Food is taken in by the mouth and wastes are released through the anus.
Phylum Annelida: Segmented Worms
They include leeches and bristleworms as well as earthworms. Segmented Worms (Earthworms, Bristleworms, and Leeches) Segmented Worms (Earthworms, Bristleworms, and Leeches) Segmented worms are bilaterally symetrical and have a coelom and two body openings..
The internal tube, suspended within the coelom, is the digestive tract. Body Structure Food is taken in by the mouth and wastes are released through the anus..
The setae help segmented worms move. They anchor their bodies in the soil so each segment can move the animal along. Setae Body Structure.
In most species, this segmentation continues internally as each segment is separated from the others by a body partition. Body Structure Segments.
Segmentation also allows for specialization of body tissues. Certain segments have modifications for functions such as sensing and reproduction. Body Structure.
Nervous system Some sensory organs are sensitive to light, and eyes with lenses and retinas have evolved in certain species..
Nerve cords connect the brain to nerve centers called ganglia, located in each segment. Setae Nerve Brain Nervous system Segments.
Circulation and Respiration Blood carrying oxygen to and carbon dioxide from body cells flow through vessels to reach all parts of the body. Segmented worms must live in water or in wet areas on land because they exchange gases directly through their moist skin..
Digestion and Excretion Food and soil taken in by the mouth eventually pass to the gizzard..
Mouth Crop Gizzard Digestion and Excretion Circulatory System.
Segmented worms have two nephridia in almost every segment. These collect waste and transport it through the coelom and out of the body. Nephridia Digestion and Excretion.
Reproduction During mating, two worms exchange sperm. Each worm forms a capsule for the eggs and sperm..
In two to three weeks, young worms emerge from the eggs. Reproduction.
Bristleworm larvae hatch in the sea and become part of the plankton. Once segment development begins, the worm settles to the bottom. Reproduction.
Section 27.2 Summary – pages Annelida includes three classes: class Oligochaeta, earthworms class Polychaeta, bristleworms and their relatives class Hirudinea, leeches Diversity of Segmented Worms
Oligochaeta: Earthworms As an earthworm burrows through soil, it loosens, aerates, and fertilizes the soil..
Polychaete means many bristles . A polychaete has a head with well-developed sense organs, including eyes..
Polychaeta: Bristleworms Parapodia also function in gas exchange..
Hirudinea: Leeches Many are parasites that suck blood or other body fluids from the bodies of their hosts (ducks, turtles, fishes, and humans)..
Other chemicals prevent the blood from clotting. A leech can ingest two to five times its own weight in one meal. Hirudinea: Leeches Front and rear suckers enable leeches to attach themselves to their hosts..
Origins of Segmented Worms.
Some of these tubes appear in the fossil record as early as 540 million years ago. Origins of Segmented Worms.

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