Caesiura Pygmygoby

Trimma caesiura

The Caesiura Pygmygoby is a small fish associated with reef environments, found across the Western Pacific from the Chesterfield Banks and New Caledonia to Samoa, and also reported in the Ryukyu Islands. It typically resides in clear lagoon and seaward reef areas, often making its home within crevices and caves formed by mostly dead coral rock and sandy rubble. This solitary species can be recognized by its red-orange body, which features four white spots along the dorsolateral side from the tail region to the start of the second dorsal fin. Its facial markings include two thin, diffuse white diagonal lines below the eye and one above the preopercle. The species lacks elongated first dorsal spines, and its fifth pelvic fin ray branches once in a dichotomous manner. Divers are likely to encounter this species at depths reaching up to 70 meters, though it is more commonly found in shallower waters, with most sightings occurring at less than 40 meters and many at less than 20 meters. The Caesiura Pygmygoby can grow to a maximum length of 3.5 cm. It poses no threat to humans and is not targeted by fisheries. According to the IUCN Red List, it is classified as Least Concern. Spotting this small goby during a dive can be a rewarding experience due to its solitary behavior and tendency to hide in crevices. Divers should look for its unique coloration and markings to differentiate it from similar species like Trimma naudei and Trimma okinawae.