Cladonema is a genus of hydrozoa belonging to the family Cladonematidae.

The genus has almost cosmopolitan distribution.

Species:

• Cladonema californicum Hyman, 1947
• Cladonema myersi Rees, 1949
• Cladonema novaezelandiae Ralph, 1953
• Cladonema pacificum Naumov, 1955
• Cladonema radiatum Dujardin, 1843
• Cladonema timmsii Gershwin & Zeidler, 2008

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