Desis marina, also known as the intertidal spider or marine spider, is a species of Desidae found in New Zealand and New Caledonia. It was first described by naturalist James Hector in 1878 from specimens found at Cape Campbell. The spider is over 8 mm in length, with very large chelicerae (fang-like structures), a red-brown cephalothorax (head region) and a creamy grey abdomen. It occurs exclusively on rocky shores where it lives in the intertidal zone. In this zone it lives in silk retreats built inside seashells, crevices and bull kelp holdfasts. It is capable of surviving complete submergence in these silk retreats for over 19 days (which is supported by its lower respiration rate). Like all spiders, it is a predator and feeds upon invertebrates such as amphipods and isopods. The females usually produce several egg sacs (around September to January) which the female guards in her silk retreat and hatch by May. The females can potentially live for up to two years. The silk of D. marina is adapted for aquatic environments. Under the New Zealand Threat Classification System, it is considered "Not Threatened".

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