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Class Hydrozoa

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Class Hydrozoa (2700 species)

• Order Actinulida (2+ Families, 2+ Genera, 9+ Species)
• Order Chondrophora (2+ Families, 2+ Genera, 3+ Species)
• Order Hydroida (3+ Suborders, 36+ Families, 202+ Genera, 585+ Species)
• Order Milleporina (1+ Families, 1+ Genera, 4+ Species)
  Fire Coral
• Order Siphonophora (5+ Families, 7+ Genera, 9+ Species)
• Order Stylasterina (1+ Families, 3+ Subfamilies, 4+ Genera, 16+ Species)
  Hydrocorals
• Order Trachymedusae (4+ families, 9+ genera, 12+ species)

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