worms. flatworms phylum: platyhelminthes phylum: platyhelminthes bilateral symmetry bilateral...
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WORMSWORMS
FlatwormsFlatworms
Phylum: PlatyhelminthesPhylum: Platyhelminthes Bilateral symmetryBilateral symmetry CephalizationCephalization Acoelomates-without colelomAcoelomates-without colelom
Speckled FlatwormSpeckled Flatworm
Clings onto lower Clings onto lower rocks.rocks.
Eats amphipods Eats amphipods by engulfing them by engulfing them with mucus and with mucus and swallowing them swallowing them whole!whole!
Blood FlukeBlood Fluke
Form and FunctionForm and Function
Feeding: Feeding: Carnivores, parasiticCarnivores, parasitic Mouth with pharynx (muscular Mouth with pharynx (muscular
tube that moves food and waste)tube that moves food and waste)
Respiration, Circulation, Respiration, Circulation, ExcretionExcretion
Use diffusion for transportUse diffusion for transport Some have flame cells to filter and Some have flame cells to filter and
remove wasteremove waste Many flame cells form tubes that Many flame cells form tubes that
lead to pores on the skinlead to pores on the skin
Response Response
Ganglia for control (nerve cells).Ganglia for control (nerve cells). Eyespot – detect light.Eyespot – detect light. Some have specialized cell to Some have specialized cell to
detect chemicals,food,etc.detect chemicals,food,etc.
MovementMovement
CilliaCillia Muscle cellsMuscle cells
ReproductionReproduction
HermaphroditesHermaphrodites Asexual by fissionAsexual by fission
Groups of FlatwormsGroups of Flatworms
TurbellariansTurbellarians
Free-livingFree-living Marine or fresh Marine or fresh
waterwater
FlukesFlukes
ParasiticParasitic Infect internal Infect internal
organsorgans Blood flukes-Blood flukes-
works its way into works its way into your intestinesyour intestines
Multiple hostMultiple host
Schistosomiasis-Schistosomiasis-fluke eggs clot fluke eggs clot blood vessels, blood vessels, causing swelling causing swelling of tissue.of tissue.
Caused by human Caused by human waste in water waste in water supply.supply.
TapewormsTapeworms
ParasiticParasitic Lives in intestinesLives in intestines Long and flatLong and flat Scolex- suckers or Scolex- suckers or
hookshooks
RoundwormsRoundworms
UnsegmentedUnsegmented Most are Most are
freelivingfreeliving Digestive tract Digestive tract
with two openingswith two openings
Form and Form and FunctionFunction
FeedingFeeding
Most are carnivoresMost are carnivores Use mouth parts and spines to Use mouth parts and spines to
catch foodcatch food Some eat algaeSome eat algae Some are decomposersSome are decomposers
Respiration, Circulation, Respiration, Circulation, ExcretionExcretion
No internal transport- diffusionNo internal transport- diffusion
Response Response
Ganglia from head Ganglia from head Simple structures to detect Simple structures to detect
chemicalschemicals
MovementMovement
Hydrostatic skeletonHydrostatic skeleton Muscles and fluid in the Muscles and fluid in the
pseudocoelom work together to pseudocoelom work together to produce movementproduce movement
ReproductionReproduction
SexuallySexually Internal fertilizationInternal fertilization
Human DiseaseHuman Disease
TrichinosisTrichinosis
Lives in intestines Lives in intestines of mammalsof mammals
1. Females 1. Females burrow into burrow into intestinal wall intestinal wall
2. Eggs into 2. Eggs into larvae travel to larvae travel to organs by organs by bloodstream.bloodstream.
Filarial WormsFilarial Worms
Live in blood Live in blood vesselsvessels
Transmitted by Transmitted by mosquitoesmosquitoes
Can block the Can block the movement of movement of fluidsfluids
ElephantiasisElephantiasis
AscarisAscaris
1. Eggs hatch in 1. Eggs hatch in intestinesintestines
2. Burrow into 2. Burrow into bloodstream to lungsbloodstream to lungs
3. Travel to air 3. Travel to air passages, then passages, then swallowedswallowed
4.Carried to the 4.Carried to the intestinesintestines
AnnelidsAnnelids
Body segmentsBody segments True coelom lined True coelom lined
with mesodermwith mesoderm
Form and FunctionForm and Function
Feeding and digestionFeeding and digestion Filter feeders to predatorsFilter feeders to predators In earthworm pharynx to In earthworm pharynx to
esophagus to crop to gizzard to esophagus to crop to gizzard to intestineintestine
Circulation- closed system, Two Circulation- closed system, Two major blood vesselsmajor blood vessels
Dorsal runs to the head, Ventral to Dorsal runs to the head, Ventral to the tailthe tail
Respiration- Through the skin, gills Respiration- Through the skin, gills in aquatic annelidsin aquatic annelids
Excretion- Nephridia filters fluid in Excretion- Nephridia filters fluid in the coelom, anus for the digestive the coelom, anus for the digestive tracttract
Movement- Hydrostatic, setaeMovement- Hydrostatic, setae Reproduction- Most are sexual, Reproduction- Most are sexual,
HermaphroditesHermaphrodites Clitellum used to form mucus ringClitellum used to form mucus ring
GROUPS OF GROUPS OF ANNELIDSANNELIDS
Oligochaetes- EarthwormsOligochaetes- Earthworms
Hirudinea- LeechesHirudinea- Leeches
PolychaetesPolychaetes
Sandworms, Sandworms, bloodwormsbloodworms
Earthworm Earthworm DissectionDissection
External ViewExternal View
Internal StructureInternal Structure
PharynxPharynx
Aortic ArchesAortic Arches
Seminal VesicleSeminal Vesicle
Seminal ReceptacleSeminal Receptacle
SeptumSeptum
CropCrop
GizzardGizzard
IntestineIntestine
Ventral Nerve CordVentral Nerve Cord
Dorsal Blood VesselDorsal Blood Vessel
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