Common name: nail sea star

General information

The Red Knob Sea Star, Mithrodia clavigera, is a striking marine invertebrate known for its vibrant color and distinctive red knobs or spines that cover its body. This sea star is not only a beautiful addition to the reef aquarium but also an interesting species to observe due to its behaviors and interactions within the tank environment.

Care

Mithrodia clavigera requires a well-established aquarium with ample live rock and a sandy substrate to thrive. It is sensitive to water quality and requires stable conditions with low nitrate levels. Care should be taken to acclimate this sea star slowly to avoid shock. It is an omnivore, feeding on detritus, small invertebrates, and occasionally coral polyps, so it may not be suitable for a reef tank with delicate corals.

Reproduction

In the wild, Mithrodia clavigera reproduces by releasing eggs and sperm into the water column, where fertilization occurs. In the aquarium, sexual reproduction is rare, but hobbyists may observe asexual reproduction through fragmentation if conditions are favorable.

Symbiosis

While not known for any specific symbiotic relationships, the Red Knob Sea Star can contribute to the tank's cleanup crew by consuming detritus and uneaten food, thus helping to maintain water quality.

Habitat

Mithrodia clavigera is found in the Indo-Pacific region, typically in coral reef environments and rocky substrates. It prefers moderate to strong water currents and is often seen at depths ranging from the intertidal zone to deeper waters.