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Phylum Annelida: Segmented Worms

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: Segmented Worms

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  1. Phylum Annelida: Segmented Worms

  2. Phylum Annelida • Class Oligochaeta, earthworms • Class Polychaeta, (Poly = many, Chaeta = bristle) • Class Hirundinea, leeches

  3. Characteristics of Annelids • Coelomates • Have segments • Highly specialized organ systems. • Most annelids have external bristles called setae

  4. 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

  5. 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

  6. 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.

  7. Class Oligochaeta

  8. Visual Concept: Movement of an EarthwormFeeding Habits of an Earthworm

  9. 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

  10. Leeches • Predators or scavengers; small number are parasites • Parasitic leeches secrete chemicals called anticoagulants • Hirudin • Secrete an anesthetic

  11. Class Polychaeta

  12. 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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