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Ectopleura crocea is a common hydroid in the Atlantic, usually abundant on artificial substrates. They form dense tufs with hundreds of individuals, which hydrocaulli are up to 10-12 cm long. The species doesn’t have a medusa in its life cycle, and gametes are produced within structures called gonophores, which stay fixed to the polyp body. Individuals are either male or female. Spermatozoa are released into the water from male gonophores, fertilizing the eggs that remain within female gonophores. Embryos d
