Order Trachymedusae

• Medusa is the dominant polyp.
• They have reduced or no polyp stage.
• Their tentacles are inserted above umbrellar margin and not on the rim of the umbrella.
• Have actual representatives whose life cycle don’t produce polyp and are only medusa all throughout.
• Rophalonematidae - has a small manubrium, 8 radial canals, and distinct lips.
• Identify the species:

  Benthocodon hyalinus

  
• Phylum: Cnidaria

  Class: Hydrozoa

  Subclass: Trachylinae

  Order: Trachymedusae

  Family: Rhopalonematidae