This new species of pea crab, Serenotheres janus, is named after the Roman two-faced god, Janus, as it has an unusually-shaped carapace that looks like two sides of a tent when seen from above.
The museum’s head, Prof. Peter Ng, and Dr Christopher Meyer from the Smithsonian Natural Museum of Natural History, United States of America described the crab from a large date mussel collected from Solomon Island.
The crab lives inside (and are parasites of) the date mussel, Leiosolenus obesus, which resemble date seeds. These mussels burrow into coral rock for protection. Thus, the crabs live a doubly protected lifestyle inside a mussel that lives inside a rock.
Currently, only one specimen of Serenotheres janus is known, and it certainly shows that it pays to look into every nook and cranny (and every shell) for undiscovered life!
Ng PKL, Meyer C (2016) A new species of pea crab of the genus Serenotheres Ahyong & Ng, 2005 (Crustacea, Brachyura, Pinnotheridae) from the date mussel Leiosolenus Carpenter, 1857 (Mollusca, Bivalvia, Mytilidae, Lithophaginae) from the Solomon Islands. ZooKeys 623: 31-41. doi: 10.3897/zookeys.623.10272