Aggregating anemone

Appearance

The polyps of "Anthopleura elegantissima" reach up to eight cm across the oral disk with approximately 100 tentacles in three or four rows around the margins of the oral disk. Most are olive to bright green with tentacles tipped in pink. Individuals that live in microhabitats that are deficient in photosynthetically active radiation, such as under docks or in caves, lack symbionts and are pale yellow to white in color.

Predators

The few known predators of "Anthopleura elegantissima" include the nudibranch "Aeolidia papillosa", leather star "Dermasterias imbricata" and mosshead sculpin "Clinocottus globiceps".

Evolution

This species of anemone is capable of reproducing both sexually and asexually. As adults, "A. elegantissima" release gametes into the water that join to form genetically unique individuals that settle on intertidal rock. This genetically distinct individual can then proliferate through binary fission. Some argue that this is not true reproduction but actually a form of growth. Fission is often prompted in the autumn by a decrease in the abundance of food and follows sexual spawning in summer. Over time, a single individual can generate a large colony of genetically identical polyps. Because of its ability to grow in this manner, the genetic entity of a colony is potentially immortal on an ecological time scale.