Sea anemone spine cells are used to protect themselves in the ocean.

It’s not just crabs that use sea anemone spine cells to protect their animals in the ocean. Many hermit crabs (Fig. 1-6) also collect sea anemones and place them on their shells as defensive weapons against crushed fish (such as many puffers).
However, in the use of sea anemones, some Gastropoda naked branching mollusks (commonly known as sea slugs, Fig. 7-9) are the most powerful. Host crabs and crabs need to form a symbiotic relationship with sea anemones, and these naked gills will directly swallow sea anemones as prey. Their magical digestive system will not only not be affected by the sea. The damage of sunflower toxin can also screen out the spine cells of sea anemone, collect them in vivo, and transmit them to the antennal tissue of their back to achieve the same defensive effect as sea anemone.