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Characteristics and classification of
phylum Echinodermata
Presented by: Kanwal Nisa
Characters:
 (Echinos: Spines; derma: Skin)
 Kingdom: Animalia
 Habitat: These are exclusively marine
 Grade of organization: organ system grade
 Germ layer: triploblastic
 Symmetry: Adults are radially symmetrical while the larvae
are bilaterally symmetrical.
 Coelom: present ( coelomate)
 Body without segmentation
 The shape of the body is flat, star like, spherical or
elongated.
 Head is absent
 Mouth is present on ventral side while anus is present on
dorsal side
 Respiration: by papule, gills or clocal respiratory tree
 Nervous system: absent, they are brainless organism.
 Circulatory system: is reduced, heart is absent.
 Presence of tube feet.
 Digestive system: complete
 Excretory system: absent
 Sexes: mostly dioecious, rarely monocious
 Reproduction:
 Sexual: by gamatic fusion
 Asexual: regeneration
Classification:
Class 1 Asteroidea
 Body is flattened star shaped with five arms
 They possesses tube feet with a sucker
 Presence of calcareous plates and movable spines.
 Respiratory organ: papulae
 Examples: Asterias (Star fish), Astropecten, Zoraster, Oreaster
Class 2 Ophiuroidea
 Body is flat with pentamerous disc
 They possesses tube feet without sucker
 Anus and intestine are absent
 Respiratory organ: Bursae
 Examples: Ophiderma, ophiothrix, Astrophyton, Amphuria, etc.
 They possess a long arm which is sharply demarcated from the central disc.
Class 3 Echinoidea
 Body is disc-like hemi-spherical
 They are devoid of arms or free-rays.
 They possesses tube feet with a sucker.
 They possess compact skeleton and movable spines.
 Examples: Echinus (Sea urchin), Cidaris, Arbacia, Echinocardium.
Diadema
Class 4 Holothuroidea
 Body is elongated in the oral-aboral axis and it is like
cucumber.
 They have no arms, spines and pedicellariae.
 The tube feet are sucking type which is modified into
tentacles and form a circle around mouth.
 Respiratory organ: cloacal respiratory tree
 Examples: Cucumaria (Sea cucumber), Holothuria,
Mesothuria, etc
Class 5 Crinoidea
 Some of the forms were extinct and living forms.
 Body is star shaped
 Arms bifurcated, with two pinnules.
 They have tube feet without suckers
 Examples: Neometra, Antedon, Rhizocrinus, etc
Thank you

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ppt 1.pptx

  • 1. Characteristics and classification of phylum Echinodermata Presented by: Kanwal Nisa
  • 2. Characters:  (Echinos: Spines; derma: Skin)  Kingdom: Animalia  Habitat: These are exclusively marine  Grade of organization: organ system grade  Germ layer: triploblastic
  • 3.  Symmetry: Adults are radially symmetrical while the larvae are bilaterally symmetrical.  Coelom: present ( coelomate)  Body without segmentation  The shape of the body is flat, star like, spherical or elongated.  Head is absent
  • 4.  Mouth is present on ventral side while anus is present on dorsal side  Respiration: by papule, gills or clocal respiratory tree  Nervous system: absent, they are brainless organism.  Circulatory system: is reduced, heart is absent.  Presence of tube feet.
  • 5.  Digestive system: complete  Excretory system: absent  Sexes: mostly dioecious, rarely monocious  Reproduction:  Sexual: by gamatic fusion  Asexual: regeneration
  • 6. Classification: Class 1 Asteroidea  Body is flattened star shaped with five arms  They possesses tube feet with a sucker  Presence of calcareous plates and movable spines.  Respiratory organ: papulae  Examples: Asterias (Star fish), Astropecten, Zoraster, Oreaster
  • 7. Class 2 Ophiuroidea  Body is flat with pentamerous disc  They possesses tube feet without sucker  Anus and intestine are absent  Respiratory organ: Bursae  Examples: Ophiderma, ophiothrix, Astrophyton, Amphuria, etc.  They possess a long arm which is sharply demarcated from the central disc.
  • 8. Class 3 Echinoidea  Body is disc-like hemi-spherical  They are devoid of arms or free-rays.  They possesses tube feet with a sucker.  They possess compact skeleton and movable spines.  Examples: Echinus (Sea urchin), Cidaris, Arbacia, Echinocardium. Diadema
  • 9. Class 4 Holothuroidea  Body is elongated in the oral-aboral axis and it is like cucumber.  They have no arms, spines and pedicellariae.  The tube feet are sucking type which is modified into tentacles and form a circle around mouth.  Respiratory organ: cloacal respiratory tree  Examples: Cucumaria (Sea cucumber), Holothuria, Mesothuria, etc
  • 10. Class 5 Crinoidea  Some of the forms were extinct and living forms.  Body is star shaped  Arms bifurcated, with two pinnules.  They have tube feet without suckers  Examples: Neometra, Antedon, Rhizocrinus, etc