Bradley's Sea Star

Mithrodia bradleyi

Bradley's sea star is characterized by its five arms, which are banded in alternating shades of red or red-brown. The arms are rounded in cross-section and bear numerous small bumps along with a few more prominent spines arranged in distinct rows. This species can reach a diameter of up to 20 centimetres (7.9 inches) and has a small central disk. Divers can identify it by its unique coloration and the distinct patterns of spines on its arms. This sea star inhabits the eastern Pacific Ocean, ranging from Mexico to Chile, including the Gulf of California and the Galapagos Islands. It prefers rocky bottoms and coral reefs, typically found from the intertidal zone down to depths of 50 metres (160 feet). Most occurrences are shallower than 40 metres, with a significant number found under 60 metres. The species thrives in water temperatures between 19.74 °C (67.53 °F) and 24.327 °C (75.789 °F), which is cooler than typical tropical fish tanks, making it less likely to be collected for aquariums. Bradley's sea star feeds on small invertebrates and is known to be a bottom-dwelling organism. Its breeding habits are not detailed in the sources, but it is likely to reproduce through external fertilization, a common method among sea stars. Encountering this species while diving can be a pleasant experience, as they often blend into their rocky surroundings, requiring keen observation to spot them.