Phylum annelida segmented worms
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Phylum Annelida: Segmented Worms. Phylum Annelida. Class Oligochaeta, earthworms Class Polychaeta, (Poly = many, Chaeta = bristle) Class Hirundinea, leeches. Characteristics of Annelids. Coelomates Have segments Highly specialized organ systems.

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Phylum annelida
Phylum Annelida

  • Class Oligochaeta, earthworms

  • Class Polychaeta, (Poly = many, Chaeta = bristle)

  • Class Hirundinea, leeches


Characteristics of annelids
Characteristics of Annelids

  • Coelomates

  • Have segments

  • Highly specialized organ systems.

  • Most annelids have external bristles called setae


Characteristics of annelids1
Characteristics of Annelids

  • First organisms to have a body plan based on repeated body segments.

    • Septa separate segments.

  • Each segment has its own fluid-filled cavity which contains a part of the animal’s coelom.

    • digestive, excretory, and circulatory organs, loco - motor organs


Characteristics of annelids2
Characteristics of Annelids

  • Segmentation

    • greater freedom of movement

    • greater complexity of body organization

  • Well-developed cerebral ganglia

  • Annelids reproduce sexually,

    • trochophore larva only in polychaetes


Annelid diversity
Annelid Diversity

  • Grouped based on

    • the number of setae (bristles) that they have

    • the presence or absence of parapodia (fleshy extensions)

    • which are flap-shaped appendages used for gas exchange and locomotion.

  • Marine worms, earthworms, and leeches are examples of annelids.



Visual concept movement of an earthworm feeding habits of an earthworm
Visual Concept: Movement of an EarthwormFeeding Habits of an Earthworm


Class hirundinea leeches
Class Hirundinea (Leeches)

  • Smallest class of Annelids

  • Leeches live in calm bodies of fresh water

  • Suckers at both ends of its body

  • Segments are not separated internally.

  • Lack both setae and parapodia


Leeches
Leeches

  • Predators or scavengers; small number are parasites

  • Parasitic leeches secrete chemicals called anticoagulants

    • Hirudin

  • Secrete an anesthetic



Class polychaeta1
Class Polychaeta

  • Many bristles

  • Only annelid with trochophore larva

  • Antennae and specialized mouthparts

  • Marine habitats

  • Sessile and free – swimming

    • Filter – feeders or jaws for prey


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