''Ostorhinchus regula'' is a species of deep-water cardinalfish. To date, it has only been recorded from

Guam Guam (; ch, Guåhan ) is an organized, unincorporated territory of the United States in the Micronesia subregion of the western Pacific Ocean. It is the westernmost point and territory of the United States (reckoned from the geographic cent ...

and

Condor Reef Condor is the common name for two species of New World vultures, each in a monotypic genus. The name derives from the Quechua ''kuntur''. They are the largest flying land birds in the Western Hemisphere. They are: * The Andean condor (''Vult ...

in the

Carolina Islands The Caroline Islands (or the Carolines) are a widely scattered archipelago of tiny islands in the western Pacific Ocean, to the north of New Guinea. Politically, they are divided between the Federated States of Micronesia (FSM) in the centra ...

, although the difficulty in observing and collecting this fish has led the authors who described the species to predict that it is likely to have a far wider distribution. This species grows up to 40mm in length with five broad longitudinal yellowish-brown stripes alternating with four much narrower whitish stripes. The brown stripes go much darker on the caudal peduncle and the strong contrast of the stripes here has led to the scientific name "''regula''", meaning "ruler".

References

regula Fish described in 2003 Taxa named by Thomas H. Fraser Taxa named by John Ernest Randall {{Kurtiformes-stub