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The Worms. Phylum Platyhelminthes Phylum Nemertea Phylum Nematoda Phylum Annelida . Bilateral Symmetry. One way to cut and get 2 identical halves Front (anterior) and rear (posterior) Back (dorsal) and belly (ventral) More active in pursuit of prey. Platyhelminthes - Flatworms.

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the worms

The Worms

Phylum Platyhelminthes

Phylum Nemertea

Phylum Nematoda

Phylum Annelida

bilateral symmetry
Bilateral Symmetry
  • One way to cut and get 2 identical halves
  • Front (anterior) and rear (posterior)
  • Back (dorsal) and belly (ventral)
  • More active in pursuit of prey
platyhelminthes flatworms
Platyhelminthes - Flatworms
  • Dorsoventrally flattened
  • Simple Central Nervous system
  • Muscular system, Reproductive system - True organs
  • Singular opening for gut
20 000 species of flatworms
20,000 Species of Flatworms
  • Turbellarians - Free-living carnivores, seen most in marine habitats
  • Flukes (Trematodes) – largest group, parasites
  • Tapeworms (cestodes) – live in intestines.
ribbon worms nemertea
Ribbon Worms (Nemertea)
  • Sac Gut digestive tract (mouth, gut)
  • Circulatory system/Hermaphrodites
  • Proboscis – used to entangle prey
  • Feed on worms and crustaceans
nematodes some roundworms
Nematodes (some – roundworms)
  • Live in sediment or tissues of marine organisms (parasitic)
  • Cylindrical body, pointed at both ends.
  • Larva found in the flesh of many fish
    • Infection of humans from eating raw or under cooked fish
annelida segmented worms
Annelida – segmented worms
  • Includes earthworms and many marine worms
  • Polychaetes – marine annelids.
    • Each segment has parpodia with setae at the ends.
    • Closed circulatory system
    • Most carnivores - Nereis
more annelids
More Annelids
  • Oligochaetes
    • Marine earthworms, found in mud and sand
  • Leeches (Hirudinea)
    • Most are freshwater – sucker at ends
slide10

Tube worm

Beard Worm

Arrow Worm

brachiopoda not a worm
Brachiopoda (not a worm)
  • Lamp shell
  • Two valves, dorsal and ventral
  • Lophophore, unique feeding structure – like two ciliated, coiled arms
the christmas tree worm
The Christmas Tree Worm

The Christmas tree worm, Spirobranchus giganteus, is a Christmas tree-shaped serpulid tube-dwelling worm with magnificent twin spirals of plumes used for feeding and respiration. This cone-shaped worm is one of the most widely recognized sedentary polychaete worms.