Nudibranch Egg Ribbon.jpg
Orchid Island, Taiwan -- Flower-shaped orange nudibranch egg ribbon on coral substrate.
Nudibranchs lay their eggs in every size, color and shape imaginable from an oviduct located on the right side of their body. In some instances a single ribbon can contain up to 25 million eggs!
Most often the egg ribbon takes the shape of coils or spirals, but sometimes they appear as tangled masses of strings, chains of beads, or cylinders.
The egg ribbon is usually laid counterclockwise, which allows the nudibranch to achieve a better spiral shape and also to anchor the egg mass with its foot.
Some species produce eggs that are caustic or even toxic. These egg masses are usually brightly colored as a warning to potential predators.