The graceful decorator crab (Oregonia gracilis), attaches organisms to its back, British Columbia, Canada, North America

Hairy squat lobster (Lauriea siagiani) amongst a pink and orange colored sponge, Tulamben, Bali, Indonesia, Southeast Asia, Asia

Hermit crab on a sponge, Dominica, West Indies, Caribbean, Central America

Small Sponge Crab, Dromia dormia, Kai Islands, Moluccas, Indonesia

Coral Crab inside sponge, Trapezia sp., Ambon, Moluccas, Indonesia

Coral Crab inside sponge, Trapezia sp., Ambon, Moluccas, Indonesia

Orangutan Crab on bubble coral, Indonesia.

Spider crab. (rr)

Spider crab on sponge.Indo Pacific

At the Center of Marine Biotechnology, Baltimore MD Yohan Zohar holds a female sponge blue crab and takes a biopsy of embryos. One female can give up to 3 million embryos.

A Slender Spongegoby (Phyllogobius platycephalops) and two different species of crabs. Attached to the goby are several parasites with egg cases, that will likely prove fatal over time. Many species live on the convuluted surface of this sponge, Philippin

The Hairy Squat Lobster (Lauria slagiani) is found alone, and in pairs, on the outside of barrel sponges belonging to the genus Xestospongia. They are tiny (one centimeter across) and difficult to find on the folds of the sponge, Philippines

Commensal Shrimp in Sponge, Periclimenes cf. tenuipes, Raja Ampat, West Papua, Indonesia