Most observed native athecate hydroids
Native to the US, by how plants support them, most observed first.
Other species All
55 native species with no plant ties on record, most observed first.
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By-the-wind Sailor
Velella velella
23,267 observations
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Blue Button
Porpita porpita
5,071 observations
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Christmas Tree Hydroid
Pennaria disticha
2,662 observations
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Branching Fire Coral
Millepora alcicornis
1,817 observations
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Red-eye Medusa
Polyorchis penicillatus
1,358 observations
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Blade Fire Coral
Millepora complanata
1,199 observations
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Pink-mouth Hydroid
Ectopleura marina
672 observations
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Green Hydra
Hydra viridissima
563 observations