Nudibranchs occur in seas worldwide, ranging from the Arctic, through temperate and tropical regions, to the
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The body forms of nudibranchs vary greatly. Because they are opisthobranchs, unlike most other gastropods, they are apparently bilaterally symmetrical externally (but not internally) because they have undergone … See more

In the course of their evolution, nudibranchs have lost their shells, while developing alternative defence mechanisms. Some species evolved an external anatomy with textures and colours that mimicked surroundin… See more

Nudibranchs are hermaphroditic, thus having a set of reproductive organs for both sexes, but they cannot fertilize themselves. Mating usually takes a few minutes, and involves a dance-like courtship. Nudibranch… See more

All known nudibranchs are carnivorous. Some feed on sponges, others on hydroids (e.g. Cuthona), others on bryozoans (phanerobranchs such as Tambja, Limacia, Plocamopherus and Triopha), and some eat other s… See more