B.K. Penney
rev. 2/18/16
BI338 Invertebrate Zoology, Fall 2011
CNIDARIAN CLASSES COMPARISON
HYDROZOA SCYPHOZOA
Both
Both (most)
Budding
Strobilation
CUBOZOA
Both
Metamorphosis
ANTHOZOA
Polyp
--------
Hypostome
Simple
Simple
-GV septae
-GV filaments
Medusa phase
-velum
-bell margin
No
No
Yes
Yes
Yes
Yes
Tubular
pharynx
Yes
Yes
Yes
Simple
Velarium
Square outline
---------------
-manubrium
-GV canals
-GV filaments
Gonads
Coloniality
MtDNA
Simple
Simple
No
Ectodermal
Some
Linear
No
Notched
(rhopalia)
Complex
Branched
Yes (oral side)
Endodermal
None
Linear
Simple
Branched
Yes (Aboral side)
Endodermal
None
Linear
---------------------Endodermal
Some
Circular
Forms
-medusa by
Polyp phase
-mouth
GV= Gastrovascular
Sketch the types below the columns!
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B.K. Penney
rev. 2/18/16
CNIDARIA : TAXA TO KNOW
Class HYDROZOA
Order Hydroida (e.g. Hydra, Tubularia, Obelia)
Order Trachylina (e.g. Craspedacusta)
Order Siphonophora (e.g. Physalia)
Order Chondrophora (e.g. Porpita, Velella)
Class SCYPHOZOA (jellyfish)
[Class CUBOZOA- no specimens]
Class ANTHOZOA
SubClass Octocorallia (=Alcyonaria)
Order Alcyonacea (e.g. Alcyonium)
Order Gorgonacea (e.g. Gorgonia, sea fans)
Order Pennatulacea (e.g. Pennatula, Renilla)
Subclass Hexacorallia (= Zoantharia)
Order Actinaria (e.g. Metridium)
Order Scleractinia (e.g. stony corals)
Order Corallimorpha (e.g. Corynactis)
[SubClass Ceriantipatharia]
[Order Ceriantharia (e.g. tube anemones)
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