• Placozoa
  Placozoa

  A phylum of primitive invertebrate animals that exemplify a simple body organization. Trichoplax adhaerens is considered a key species for early metazoan evolution....<br/>Year introduced: 2009
  MeSH
• Chordata, Nonvertebrate
  Chordata, Nonvertebrate

  A portion of the animal phylum Chordata comprised of the subphyla CEPHALOCHORDATA; UROCHORDATA, and HYPEROTRETI, but not including the Vertebrata (VERTEBRATES). It includes no...<br/>Year introduced: 2000(1966)
  MeSH
• Echinodermata
  Echinodermata

  A phylum of the most familiar marine invertebrates. Its class Stelleroidea contains two subclasses, the Asteroidea (the STARFISH or sea stars) and the Ophiuroidea (the brittle...<br/>
  MeSH

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