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PHYLUM
ECHINODERMATA
Echinoderms: Sea stars, brittle stars, feather stars, sea cucumbers, sea
urchins
CHARACTERISTICS
• Radial symmetry
• Several arms (5 or
more, mostly grouped 2 left- 1
middle- 2 right) radiating from
a ce...
CHARACTERISTICS

• No brain nor hearts
• With eyespots on each arm
• Mouth situated on the
underside and anus on top
(exce...
CHARACTERISTICS
• Some are carnivorous
while others are detritus
foragers.
• Reproduction is through
release of sperms and...
TYPES OF ECHINODERMS

•Class Asteroidea
•Class Ophiurodea
•Class Echinoidea
•Class Holothuroidea
•Class Crinoidea
WHAT IS THIS?
• Cushion starfish (Culcita nouvaeguineae)
CLASS ASTEROIDEA

• Carnivorous and feed on sponges and
molluscs some are specialized
feeders.(crown of thorns)
• Doesn’t ...
TRIVIA
• Crown of thorns (Acanthaster planci)
• One of the largest and the most venomous
starfish.
• Size reaches up to 50...
CROWN OF THORNS
(ACANTHASTER PLANCI)
CLASS OPHIUROIDEA
• Close relatives of sea stars
• Have five snakelike arms which
are highly flexible.
• No replication of...
• Arms of brittle stars
are fragile. ( Defense
Mechanism)
• Most active and
fastest moving
echinoderms
• Feed on plankton ...
• Serpent Stars
• Coiled snakelike
around branches of
gorgonians.
TRIVIA
• Basket stars
• Specialized type of brittle
stars

(Astroglymma sculptum)
CLASS ECHINOIDEA
Sea urchins
• External chitinous skeleton
and a centrally located jaw
• Some have speherical bulblike clo...
• Locomotion by tube feet
but also by movement of
the spines on the underside
of the body.
• Generally nocturnal
• Most ar...
CLASS HOLOTHUROIDEA
• Don’t have radial symmetry
but are bilateral.
• Cucumber shaped with
elongated muscular, flexible
bo...
• Feed on rich organic film
coating sandy surfaces.
• Crawl over the bottom
and ingest sand.
• Move by means of tube
feet....
PHYLUM CRINOIDEA
• Radial symmetry
• Cup-shaped body
• Numerous feathery arms project from a central
disc.
• Have 5 up to ...
FEATHER STARS
• Source: http://www.starfish.ch/reef/echinoderms.html#starfish
Echinoderms
Echinoderms
Echinoderms
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Echinoderms

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Echinoderms

  1. 1. PHYLUM ECHINODERMATA Echinoderms: Sea stars, brittle stars, feather stars, sea cucumbers, sea urchins
  2. 2. CHARACTERISTICS • Radial symmetry • Several arms (5 or more, mostly grouped 2 left- 1 middle- 2 right) radiating from a central body. • Body consist of equal segments, each containing a duplicate of various internal organs.
  3. 3. CHARACTERISTICS • No brain nor hearts • With eyespots on each arm • Mouth situated on the underside and anus on top (except feather stars, sea cucumbers and some urchins). • Contains tube feet with suction pads controlled by water vascular system.
  4. 4. CHARACTERISTICS • Some are carnivorous while others are detritus foragers. • Reproduction is through release of sperms and egg into the water. • Capable of regeneration and fragmentation.
  5. 5. TYPES OF ECHINODERMS •Class Asteroidea •Class Ophiurodea •Class Echinoidea •Class Holothuroidea •Class Crinoidea
  6. 6. WHAT IS THIS?
  7. 7. • Cushion starfish (Culcita nouvaeguineae)
  8. 8. CLASS ASTEROIDEA • Carnivorous and feed on sponges and molluscs some are specialized feeders.(crown of thorns) • Doesn’t have hard mouth parts to help them capture prey.
  9. 9. TRIVIA • Crown of thorns (Acanthaster planci) • One of the largest and the most venomous starfish. • Size reaches up to 50 cm in diameter. • 10 to 20 spiny arms with formidable thorn like toxic spines • Feed on coral polyps • Predators: Triton shell and some puffer fish
  10. 10. CROWN OF THORNS (ACANTHASTER PLANCI)
  11. 11. CLASS OPHIUROIDEA • Close relatives of sea stars • Have five snakelike arms which are highly flexible. • No replication of internal organs, just one set in the central disk. • Smaller central disk and no anus.
  12. 12. • Arms of brittle stars are fragile. ( Defense Mechanism) • Most active and fastest moving echinoderms • Feed on plankton but also on detritus.
  13. 13. • Serpent Stars • Coiled snakelike around branches of gorgonians.
  14. 14. TRIVIA • Basket stars • Specialized type of brittle stars (Astroglymma sculptum)
  15. 15. CLASS ECHINOIDEA Sea urchins • External chitinous skeleton and a centrally located jaw • Some have speherical bulblike cloaca. • Movable spines are attached to the body, some are venomous
  16. 16. • Locomotion by tube feet but also by movement of the spines on the underside of the body. • Generally nocturnal • Most are algal grazers but some feed on sponges and detritus.
  17. 17. CLASS HOLOTHUROIDEA • Don’t have radial symmetry but are bilateral. • Cucumber shaped with elongated muscular, flexible body with mouth at one end anus on the other. • Tentacles present in the mouth for food collection
  18. 18. • Feed on rich organic film coating sandy surfaces. • Crawl over the bottom and ingest sand. • Move by means of tube feet. • Releases its digestive tract when threatened (defense mechanism)
  19. 19. PHYLUM CRINOIDEA • Radial symmetry • Cup-shaped body • Numerous feathery arms project from a central disc. • Have 5 up to 200 arms (pinnules) • Nocturnal • Usually cling to sponges.
  20. 20. FEATHER STARS
  21. 21. • Source: http://www.starfish.ch/reef/echinoderms.html#starfish

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