Christmas tree hydroid – Idroide piumato
Pennaria disticha, also known as the Christmas tree hydroid, is a species of athecate hydroid in the family Pennariidae. Colonies are common in the Mediterranean Sea growing on rocks close to the surface. This species has been used in research into prey capture. Colonies of Pennaria disticha consist of numerous much-branched stems up to 30 cm high. The branching system is alternate.
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