(Storsteinan - The Trondheim fjord / 7.29.2001 / 18 meters)

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Athecate hydroids are one of two orders of hydroids. The polyps of Athecate hydroids are NOT protected by a holster, like the polyps of Thecate hydroids are.

Phylum: Cnidaria

Class: Hydrozoa

Order: Anthoathecata

 

Norwegian: hydroider