Sub-topic #1: Obelia

• Contains 5 gonozoids
• Hydrocaulus

  • colony branches
• Blastostyle

  • vertical axis where medusa buds are attached to
• Identify the species:

  Obelia longissima

  
• Identify the species:

  Obelia medusa

  
• Identify the parts being pointed at:

  A - Gastrozoid or Hydranth

  B - Gonozoid or Gonangium

  C - Gonotheca

  D - Medusa buds

  Black Arrow - Pericarc or Theca

  Red Arrow - Coenosarc

  Yellow Arrow - Annulus