Topic #12: General Structure of Hydrozoan Medusa

• Identify parts of Hydrozoan Medusa:

  A) radial canal

  B) ring canal

  C) tentacular bulb

  D) adhesive pad

  E) cnidocyte batteries

  F) tentacle

  G) velum

  H) oral arm

  I) gonad

  J) manubrium

  K) stomach

  
• Identify parts of Hydrozoan Medusa:

  A) cnidocyte battery

  B) tentacle

  C) statocyst

  D) tentacular bulb

  E) radial canal

  F) gonad

  G) stomach

  H) manubrium

  I) oral arm

  J) mouth

  K) ring canal

  
• Hydrozoan Medusa

  • ball in size, small, and limited in movement
• Aboral Surface

  • common perspective when seeing jellyfish
• Oral Side Out

  • perspective from underneath
• Ex-umbrella

  • outer part of umbrella
• Sub-umbrella

  • inner part of umbrella
• Oral Arm

  • its opening is the mouth but in some cases, it is not connected to the mouth and instead have many holes
• Manubrium

  • connects mouth to stomach
• Stomach

  • divided into four or eight radial canals
• Radial Canals

  • still part of the stomach and is attached to the ring canal
• Ring Canal

  • where tentacles arise
• Gonads

  • attached to the outside of radial canal
• Tentacular Bulb

  • where digestion and absorption of food takes place
• Vellum

  • shelf-like membrane extension of an umbrella which have reproductive activity
• Adhesive Pad

  • used to attach to sea grasses
• Statocyst

  • for balance