Cnidarians

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Tag archives for Cnidarians

Scleractinian corals in many forms

Scleractinian corals, also known as stony corals — or just hard corals — are the primary reef builders in the oceans. Their polyps secrete calcium carbonate to form a skeleton. A minority of species live as single polyps, but most stony coral species are colonial, and the structures they build ‘grow’ over time. They form…

When is an anemone not an anemone?

The pretty creatures pictured here look like anemones, but they are not true anemones. They are Cerianthids, commonly referred to as ‘tube anemones’, which are taxonomically quite distinct from true anemones. Cerianthids and true anemones do belong to the same phylum, Cnidaria, and the same class, Anthozoa, but tube anemones belong to the subclass Ceriantipatharia,…