Order - Anthomedusae

(Athecate Hydroids)

The athecate hydroids, are an order of hydrozoans belonging to the phylum Cnidaria.  These hydrozoans always have a polyp stage. Their hydranths grow either solitary or in colonies. 

Prey can be captured by discharging harpoon-like structures from chambers in specialized cells on the tentacles. In hydrozoans, these are nearly always adhesive and entrapping, rather than puncturing and poisoned.

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