PhylaEchinodermataSarah Doyle & Lauren Dombkoski
Echinoderms•   a slow-moving or sessile marine    deuterostome with a water vascular system    and, in adults, radial anat...
Living Echinoderms are dividedinto six classes...• 1- Asteroidea: sea stars aka starfish• - star shaped body with multiple...
Classes, continued• 2- Ophiuroidea: brittle stars• - Distinct central disk; long, flexible arms;  tube feet lack suckers
Classes, continued•3 - Echinoidea: sea urchins and sand dollars• - Roughly spherical or disk-shaped; no arms; five rows of...
Classes, continued• 4 - Crinoidea: sea lilies and feather stars• - Feathered arms surrounding upward-pointing  mouth
Classes, continued•5 - Holothuroidea: sea cucumbers•   - Cucumber-shaped body; five rows of tube feet;    additional tube ...
Classes, continued•6 - Concentricycloidea : sea daises• - Disk-shaped body ringed with small spines;  incomplete digestive...
Physical Description•   adult forms have radial symmetry•   larvae are bilateral•   varied skeletal and muscular arrangeme...
Reproduction•   there are 2 sexes    except:    o asteroids&echinoids -      multiple gonads in arms    o crinoids - lack ...
Characteristics•Behavior• most are immobile• water vascular system originally for food    collection but now evolved for l...
Food• Crinoidea• sit with arms out and collect passing food• Asteroidea• predators or scavengers; everts stomach    and se...
Food, cont.• Echinoidea• suspension feeders,    herbivores, detritivores,    predators•   Holothuroidea•   suspension or d...
Execretion•   amoeboid cells carry wastes out of the body
Predation•   most vulnerable in larval stage•   asteriods:    o   anti-predator adaptation•   holothurians    o   discharg...
StarfishClass: AsteroideaCirulatory System:- Water-vascular system and tube feet- hemal systemNervous System:- nerve plexu...
Starfish• Digestion and Excretion:• - mouth is located on underside of the body• - Has a digestive tract• Reproduction:• -...
Feather Stars• Class: Crinoidea•Circulatory System:• - Water-vascular system and tube feet• - do not use tube feet for loc...
Feather Stars• Digestion and Excretion:• - Captures particles or plankton• - Has a digestive tract• Reproduction:• - relea...
Sea Urchin• Class: Echinoidea• Circulatory System:• - Water-vascular system and tube feet• Nervous System:• - no true brai...
Sea Urchin• Digestion and Excretion:•- Has a mouth containing teeth, jaw, andtongue like structure• - Has a digestive trac...
Phyla Echinodermata
Phyla Echinodermata
Phyla Echinodermata
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Phyla Echinodermata

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Phyla Echinodermata

  1. 1. PhylaEchinodermataSarah Doyle & Lauren Dombkoski
  2. 2. Echinoderms• a slow-moving or sessile marine deuterostome with a water vascular system and, in adults, radial anatomy• 6000 species, all marine
  3. 3. Living Echinoderms are dividedinto six classes...• 1- Asteroidea: sea stars aka starfish• - star shaped body with multiple arms; mouth directed to substrate
  4. 4. Classes, continued• 2- Ophiuroidea: brittle stars• - Distinct central disk; long, flexible arms; tube feet lack suckers
  5. 5. Classes, continued•3 - Echinoidea: sea urchins and sand dollars• - Roughly spherical or disk-shaped; no arms; five rows of tube feet enable slow movement; mouth ringed by complex, jaw-like structure
  6. 6. Classes, continued• 4 - Crinoidea: sea lilies and feather stars• - Feathered arms surrounding upward-pointing mouth
  7. 7. Classes, continued•5 - Holothuroidea: sea cucumbers• - Cucumber-shaped body; five rows of tube feet; additional tube feet modified
  8. 8. Classes, continued•6 - Concentricycloidea : sea daises• - Disk-shaped body ringed with small spines; incomplete digestive system; live on submerged wood
  9. 9. Physical Description• adult forms have radial symmetry• larvae are bilateral• varied skeletal and muscular arrangement• water vascular system• Respiration• gills on the skin
  10. 10. Reproduction• there are 2 sexes except: o asteroids&echinoids - multiple gonads in arms o crinoids - lack distinct gonads o holothurians - single gonad• gametes are released into water
  11. 11. Characteristics•Behavior• most are immobile• water vascular system originally for food collection but now evolved for locomotion• Communication• non-central nervous system: movement is sense from all sides• Development• deuterostomes: anus forms first, then mouth
  12. 12. Food• Crinoidea• sit with arms out and collect passing food• Asteroidea• predators or scavengers; everts stomach and secretes digestive enzymes on prey; suspenson feeders, too• Ophuroidea• imcomplete digestive system; predators, deposit feeders, and scavengers
  13. 13. Food, cont.• Echinoidea• suspension feeders, herbivores, detritivores, predators• Holothuroidea• suspension or deposit feeders; use digestive organs in response to threat• group of hard plates that retract and grasp like teeth
  14. 14. Execretion• amoeboid cells carry wastes out of the body
  15. 15. Predation• most vulnerable in larval stage• asteriods: o anti-predator adaptation• holothurians o discharge, sticky tubules called Cuvierian tubules
  16. 16. StarfishClass: AsteroideaCirulatory System:- Water-vascular system and tube feet- hemal systemNervous System:- nerve plexus- ringed nerves
  17. 17. Starfish• Digestion and Excretion:• - mouth is located on underside of the body• - Has a digestive tract• Reproduction:• - each arm contains two gonads and releases gametes into surrounding water• - fragmentation• Symmetry:• - pentamerous symmetry
  18. 18. Feather Stars• Class: Crinoidea•Circulatory System:• - Water-vascular system and tube feet• - do not use tube feet for locomotion• Nervous System:•- Has small sensory cells throughout their skin•- Central nervous ring around the mouth,arms, and base
  19. 19. Feather Stars• Digestion and Excretion:• - Captures particles or plankton• - Has a digestive tract• Reproduction:• - releases sperm and egg into surrounding water• Symmetry:• - radial symmetry
  20. 20. Sea Urchin• Class: Echinoidea• Circulatory System:• - Water-vascular system and tube feet• Nervous System:• - no true brain• - Central nervous ring around the mouth
  21. 21. Sea Urchin• Digestion and Excretion:•- Has a mouth containing teeth, jaw, andtongue like structure• - Has a digestive tract• Reproduction:• - releases sperm and egg into surrounding water• Symmetry:• - radial symmetry

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