Common name: Chitons

Rhyssoplax is a genus of chitons, marine mollusks that belong to the class Polyplacophora. These fascinating creatures are known for their unique armor-like appearance, consisting of eight interlocking plates that provide both protection and flexibility. Found in intertidal zones and shallow waters, Rhyssoplax species are often overlooked but play an important role in their ecosystems as grazers, feeding primarily on algae and biofilm on rocks. Their ability to cling tightly to surfaces with their muscular foot makes them resilient against strong waves and predators.

For aquarists, chitons like those in the Rhyssoplax genus can be a functional and intriguing addition to a marine aquarium, particularly in reef setups. They are excellent algae grazers and can help control nuisance algae growth on rocks and glass. However, they require a stable and mature aquarium environment with plenty of live rock and surfaces to graze on. It's essential to ensure that water parameters are stable, as chitons are sensitive to rapid changes in salinity, temperature, and water quality. They are generally peaceful and compatible with other tank inhabitants, but care should be taken to avoid housing them with aggressive predators that might prey on them.

Scientifically, chitons are remarkable for their radula, a specialized feeding structure lined with rows of tiny teeth made of magnetite, one of the hardest known biominerals. This adaptation allows them to scrape algae off even the toughest surfaces. Their history dates back hundreds of millions of years, making them one of the more ancient marine invertebrates still thriving today. Their presence in an aquarium not only adds to the biodiversity but also provides a glimpse into the resilience and adaptability of marine life.