Cirrhilabrus rhomboidalis, commonly known as the diamond-tail fairy wrasse, is a species of wrasse that is endemic to the Marshall Islands, specifically found in Kwajalein Atoll. These small, colorful fish inhabit coral reefs at depths of up to 40 meters (130 feet). The total length of this species can reach up to 8.5 centimeters (3.3 inches).
The name Cirrhilabrus is a combination of two Latin words:
- The prefix “Cirrhi” comes from the Latin word “cirrus,” which means “to curl.” In zoology, “cirri” refer to filamentous tendrils or appendages, often found at the terminal ends of physical characteristics. All members of the Cirrhilabrus genus possess short fleshy appendages, or “cirri,” at the tip of each dorsal fin spine.
- The suffix “labrus” means “wrasse,” derived from the Latin word “labium,” which means “lip.” Many labrids have fleshy lips. Thus, the name Cirrhilabrus aptly describes the morphological attributes of this genus.
The specific epithet “rhomboidalis” refers to the geometric shape rhombus, which describes the distinctive caudal fin of this species. The rhomboidal tail has earned it the common name “diamond-tail fairy wrasse.” Although other species with similar tail shapes have been discovered, C. rhomboidalis remains notable for this trademark feature.
