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Unsegmented Worms. Flatworms. Flatworms. Belong to the phylum platyhelminthes . (Plat = flat) There are three classes: Turbellaria Trematoda Cestoda. Characteristics of Flatworms. They are acoelomates (they don’t have body cavities) They have bilateral symmetry Show cephalization

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Presentation Transcript
flatworms3
Flatworms
  • Belong to the phylum platyhelminthes. (Plat = flat)
  • There are three classes:
    • Turbellaria
    • Trematoda
    • Cestoda
characteristics of flatworms
Characteristics of Flatworms
  • They are acoelomates (they don’t have body cavities)
  • They have bilateral symmetry
  • Show cephalization
  • Respiration through skin
  • Single opening to digestive tract (pharynx)
class turbellaria
Class Turbellaria
  • Spade-shaped head and two eyespots
  • Eat protozoans for scavenge
  • Flame cells remove waste
  • Are hermaphrodites (have male and female reproductive parts)
  • Can reproduce by regeneration
  • Are free-living
class trematoda
Class Trematoda
  • Are parasitic flukes
  • Have suckers on both ends of the body
  • Can live inside or outside of host
class trematoda9
Class Trematoda
  • Nervous and excretory systems like turbellarians
  • Hermaphrodites
  • Have complex life cycles
slide11

Fluke Life-Cycles

The long and complex life-cycle of the fluke can be made easier to

understand through the use of a nonsense mnemonic :

Every - EggMirror - Miracidium (free-living in water)Spotted - Sporocyst (in snail)Red - Redia (in snail)Certainly - Cercaria (free-living in water/snail)Met - Metacercaria (in 2nd intermediate host)Approval - Adult

class cestoda
Class Cestoda
  • Parasitic
  • Tapeworms
  • Long, ribbon-like bodies
  • Absorbs nutrients from host
  • Hermaphrodites
roundworms

Roundworms

Roundworms

roundworms18
Roundworms
  • Belong to phylum Nematoda
  • Pseudocoelomates (fluid filled body cavity)
  • Slender bodies that taper on both ends
  • Have mouth and anus
  • Can be free-living or parasitic
rotifers
Rotifers
  • Known as rotifers or wheel animals
  • Transparent, free-swimming microscopic animal
  • Freshwater & marine
  • Have a ring of cilia around mouth that rotates like a wheel to bring in food
  • Feed on unicellular algae, bacteria, & protozoa
rotifers23
Rotifers
  • Have a muscular organ called the mastax behind the pharynx to chop food
  • Nervous system composed of anterior ganglia & 2 long nerve cords
  • Show cephalization (head end)
  • Have 2 anterior, light-sensitive eyespots