• Arbacia
  Arbacia

  A genus of SEA URCHINS in the family Arbaciidae. They have only one spheridium (stalked body) per ambulacral area (contains tube feet); most sea urchins have several spheridia...<br/>Year introduced: 2005
  MeSH
• Asterina
  Asterina

  A genus of STARFISH in the family Asterinidae. They externally hold developing embryos (EMBRYO, NON-MAMMALIAN) among the spines below the oral surface....<br/>Year introduced: 2005
  MeSH
• Asterias
  Asterias

  A genus of STARFISH in the family Asteriidae. One species, Asterias rubens, is the most common in the north-east Atlantic region.<br/>Year introduced: 2005
  MeSH
• Hagfishes
  Hagfishes

  Common name for a family of eel-shaped jawless fishes (Myxinidae), the only family in the order MYXINIFORMES. They are not true vertebrates.<br/>Year introduced: 2002 (1975)
  MeSH

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