WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral...
-
Upload
colin-cross -
Category
Documents
-
view
219 -
download
6
Transcript of WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral...
![Page 1: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/1.jpg)
WORMSWORMS
![Page 2: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/2.jpg)
FlatwormsFlatworms
Phylum: PlatyhelminthesPhylum: Platyhelminthes Bilateral symmetryBilateral symmetry CephalizationCephalization Acoelomates-without colelomAcoelomates-without colelom
![Page 3: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/3.jpg)
![Page 4: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/4.jpg)
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!
![Page 5: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/5.jpg)
Blood FlukeBlood Fluke
![Page 6: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/6.jpg)
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)
![Page 7: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/7.jpg)
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
![Page 8: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/8.jpg)
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.
![Page 9: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/9.jpg)
MovementMovement
CilliaCillia Muscle cellsMuscle cells
![Page 10: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/10.jpg)
ReproductionReproduction
HermaphroditesHermaphrodites Asexual by fissionAsexual by fission
![Page 11: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/11.jpg)
Groups of FlatwormsGroups of Flatworms
![Page 12: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/12.jpg)
TurbellariansTurbellarians
Free-livingFree-living Marine or fresh Marine or fresh
waterwater
![Page 13: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/13.jpg)
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
![Page 14: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/14.jpg)
![Page 15: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/15.jpg)
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.
![Page 16: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/16.jpg)
TapewormsTapeworms
ParasiticParasitic Lives in intestinesLives in intestines Long and flatLong and flat Scolex- suckers or Scolex- suckers or
hookshooks
![Page 17: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/17.jpg)
![Page 18: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/18.jpg)
RoundwormsRoundworms
![Page 19: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/19.jpg)
UnsegmentedUnsegmented Most are Most are
freelivingfreeliving Digestive tract Digestive tract
with two openingswith two openings
![Page 20: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/20.jpg)
Form and Form and FunctionFunction
![Page 21: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/21.jpg)
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
![Page 22: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/22.jpg)
Respiration, Circulation, Respiration, Circulation, ExcretionExcretion
No internal transport- diffusionNo internal transport- diffusion
![Page 23: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/23.jpg)
Response Response
Ganglia from head Ganglia from head Simple structures to detect Simple structures to detect
chemicalschemicals
![Page 24: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/24.jpg)
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
![Page 25: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/25.jpg)
ReproductionReproduction
SexuallySexually Internal fertilizationInternal fertilization
![Page 26: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/26.jpg)
Human DiseaseHuman Disease
![Page 27: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/27.jpg)
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.
![Page 28: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/28.jpg)
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
![Page 29: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/29.jpg)
![Page 30: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/30.jpg)
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
![Page 31: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/31.jpg)
![Page 32: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/32.jpg)
AnnelidsAnnelids
![Page 33: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/33.jpg)
Body segmentsBody segments True coelom lined True coelom lined
with mesodermwith mesoderm
![Page 34: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/34.jpg)
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
![Page 35: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/35.jpg)
![Page 36: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/36.jpg)
![Page 37: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/37.jpg)
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
![Page 38: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/38.jpg)
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
![Page 39: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/39.jpg)
![Page 40: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/40.jpg)
GROUPS OF GROUPS OF ANNELIDSANNELIDS
![Page 41: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/41.jpg)
Oligochaetes- EarthwormsOligochaetes- Earthworms
![Page 42: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/42.jpg)
Hirudinea- LeechesHirudinea- Leeches
![Page 43: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/43.jpg)
![Page 44: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/44.jpg)
![Page 45: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/45.jpg)
PolychaetesPolychaetes
Sandworms, Sandworms, bloodwormsbloodworms
![Page 46: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/46.jpg)
Earthworm Earthworm DissectionDissection
![Page 47: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/47.jpg)
External ViewExternal View
![Page 48: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/48.jpg)
Internal StructureInternal Structure
![Page 49: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/49.jpg)
PharynxPharynx
![Page 50: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/50.jpg)
Aortic ArchesAortic Arches
![Page 51: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/51.jpg)
Seminal VesicleSeminal Vesicle
![Page 52: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/52.jpg)
Seminal ReceptacleSeminal Receptacle
![Page 53: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/53.jpg)
SeptumSeptum
![Page 54: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/54.jpg)
CropCrop
![Page 55: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/55.jpg)
GizzardGizzard
![Page 56: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/56.jpg)
IntestineIntestine
![Page 57: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/57.jpg)
Ventral Nerve CordVentral Nerve Cord
![Page 58: WORMS. Flatworms Phylum: Platyhelminthes Phylum: Platyhelminthes Bilateral symmetry Bilateral symmetry Cephalization Cephalization Acoelomates-without.](https://reader038.fdocuments.in/reader038/viewer/2022110116/5514f572550346935c8b5f04/html5/thumbnails/58.jpg)
Dorsal Blood VesselDorsal Blood Vessel