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A cnidocyte (also known as a cnidoblast) is an explosive cell containing one large secretory organelle called a cnidocyst (also known as a cnida (pl.: cnidae)) that can deliver a sting to other organisms. The presence of this cell defines the phylum Cnidaria (corals, sea anemones, hydrae, jellyfish, etc.). Cnidae are used to capture prey and as ...
Sea anemones do not fossilize well, having no hard parts, and this one was mistakenly identified as a sea cucumber. Most Actiniaria do not form hard parts that can be recognized as fossils, but a few fossils of sea anemones do exist; Mackenzia , from the Middle Cambrian Burgess Shale of Canada, is the oldest fossil identified as a sea anemone.
Stichodactylidae is a family of sea anemones that contains the genera Stichodactyla (carpet anemones) and Radianthus.These species reside exclusively within the shallow waters of the tropical Indo-Pacific area and are in the main family of sea anemones that hosts several varieties of clownfishes. [1]
Bennett had stumbled on a rare and “highly venomous” species of sea anemone: Dofleinia armata, also known as the armed anemone or striped anemone, she wrote in a Feb. 11 Facebook post.
Some amphipods live inside the coelenteron of the sea anemone. [31] Despite their venomous cells, sea anemones are eaten by fish, starfish, worms, sea spiders and molluscs. The sea slug Aeolidia papillosa feeds on the aggregating anemone (Anthopleura elegantissima), accumulating the nematocysts for its own protection. [31]
Phyllodiscus is a monotypic genus of sea anemones in the family Aliciidae. The only species is Phyllodiscus semoni, commonly known as the night anemone, which is native to shallow seas in the central Indo-West Pacific, such as Indonesia, the Philippines and southern Japan. It is venomous and can cause a painful, long-lasting sting to humans.
The anemone feeds on sea urchins, small fish, and crabs, but detached mussels seem to be the main food source. [5] [7] There are rare instances where the giant green anemone has consumed seabirds. [9] It is not known whether the birds were alive or dead when engulfed by the anemone.
The sebae anemone (Radianthus crispa), also known as leathery sea anemone, long tentacle anemone, or purple tip anemone, is a species of sea anemone in the family Stichodactylidae and native to the Indo-Pacific. [1] It was first described in 1834 by Wilhelm Hemprich and Christian Gottfried Ehrenberg as Actinia crispa. [1] [2]