Phylogenetic Relationships of Seven Echinoderms

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Phylogenetic Relationships of Seven Echinoderms

• By Cristina Wittkopp

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Echinoderms

• Deuterostomes (means mouth second) chordates,
  hemichordates and echinoderms
• Branched from Hemichordates aprroximately 875
  mya. (Blair,2005)
• Posess pentaradial symmetry

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Pelmatozoa- Antedon mediterrenea
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Echinozoa
Apostichopus japonicus
Echinometra
Cucumaria frondosa
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These trees are based on molecular data. A. Lafay
et al. (1995) and B. Wada et al. (1996)
These trees are based on morpholophy. A. Gale
(1987 and B. Blake (1987)
(Wray G, Knott E, 2000)
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Asteroizoa
Patiria miniata- Velvatida
Astropecten polyacanthus-Paxillosida
Crossaster papposus- Velatida
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Echinoderms are monophyletic
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References

• Knott E, Wray G (2000) Controversy and Consensus
  in Asteroid Systematics New Insights to Ordinal
  and Familial Relationships. American Zoologist.
  40 382-392
• Blair J, Hedges S.(2005) Molecular Phylogeny and
  Divergence Times of Deuterostome Animals.
  Molecular Biology and Evolution. 22 2275-2288.