phylum echinodermata n.
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Phylum Echinodermata. Deuterostomia Anus forms from or near blastopore Mouth forms secondarily. Protostomes vs Deuterostomes. Plutei. Echinoderm Development. Metamorphosis of bilaterally symmetric larvae to pentaradial adults. Deuterostome Phylogeny. Echinoderm Phylogeny.

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phylum echinodermata
Phylum Echinodermata
  • Deuterostomia
    • Anus forms from or near blastopore
    • Mouth forms secondarily
echinoderm development
Echinoderm Development
  • Metamorphosis of bilaterally symmetric larvae to pentaradial adults
echinoderm symmetry
Primary bilateral symmetry

Larval forms

Some adult forms

Secondary pentaradial symmetry

5 radial divisions of major organ systems

Echinoderm Symmetry
phylum echinodermata1
Phylum Echinodermata
  • Spiny skin
  • Endoskeleton
    • Dermal ossicles
    • CaCO3, Ca2(PO3)2
phylum echinodermata2
Phylum Echinodermata
  • Water vascular system
class asteroidea
Class Asteroidea
  • Central body disc
  • Most frequently 5 arms
  • Regeneration

Starfish & Sea Stars

class ophiuroidea
Class Ophiuroidea

Sea baskets

Brittle Stars

Reduced central disc

Reduced tube feet

class ophiuroidea1
Class Ophiuroidea

Sea baskets

Basket stars

class echinoidea
Class Echinoidea

Sea urchins

Sea biscuits

Sand dollars

class holothuroidea
Class Holothuroidea

Sea Cucumbers

holothuroidea defense reaction
Holothuroidea Defense Reaction
  • Eversion of the respiratory tree and lower intestine
  • Some species produce toxins
class crinoidea
Class Crinoidea

Feather StarsSea Lillies

Sessile Crinoids

Swimming Crinoid