Hydroidolina
Subclass of hydrozoans
Hydroidolina
Hydroidolina is a subclass of Hydrozoa and makes up 90% of the class. Controversy surrounds who the sister groups of Hydroidolina are, but research has shown that three orders remain consistent as direct relatives: Siphonophorae, Anthoathecata, and Leptothecata.
Read on Wikipedia · Image Ernst Haeckel, Public domain
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