Exercise 4
This one's slightly different. See if you can use
the data below to order organisms and shared apomorphies in the following table
into their correct position on the cladogram.
|
Trachyline-like hydrozoa
(Outgroup)
|
Cubozoa
|
Anthozoa
|
Other hydrozoa
|
Scyphozoa
|
|
|
Symmetry
|
Radial | Radial | Radial | Radial | Radial |
|
Polyp in life history
|
No | Yes, but may be reduced or lost | Yes | Yes | Yes, but may be reduced or lost |
|
Medussa in life history
|
Yes | Yes | No | Yes | Yes |
|
Gonads in gastrodermis
|
No | Yes | Yes | No | Yes |
|
Rhopalium
|
No | Yes | No | No | Yes |
|
Velarium
|
No | Yes | No | No | No |
|
Strobilation
|
No | No | No | No | Yes |
|
Septa dividing coelenteron
|
No | Yes | Yes | No | Yes |
|
Siphonoglyph
|
No | No | Yes | No | No |