phylum annelida segmented worms
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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.
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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