Apogonichthys waikiki Jordan & Evermann. Type Mionorus waikiki
Subject: Apogonidae, Apogonichthys, Mionorus
Tag: Fish
Date 1905
Author David Starr Jordan (1851–1931); Barton Warren Evermann (1853–1932)
Source/Photographer Jordan, David Starr; Evermann, Barton Warren (1905) Shore Fishes of the Hawaiian Islands, With a General Account of the Fish Fauna, Bulletin of the United States Fish Commission, vol. 23 for 1903, part I, Washington, DC: Government Printing Office
Source: https://commons.wikimedia.org/wiki/File:FMIB_42447_Apogonichthys_waikiki_Jordan_%26_Evermann_Type.jpeg

The Perdix cardinalfish (Apogonichthys perdix) is a species of cardinalfishes native to the Indian Ocean and the western Pacific Ocean. Apogonichthys perdix has an olive-brown color with irregular dark spots and streaks, speckled fins, and a dark line from the eye to the origin of the lateral line. It is a small fish, with males typically reaching a maximum length of 6.0 cm. Apogonichthys perdix is found in marine environments, usually at depths ranging from 1 to 4 meters. It is a secretive and nocturnal species, often found among rubble of reef flats and 'dead' reefs. The fish displays obligate monogamy, where a one-to-one pair is established irrespective of resource abundance.

Order: Kurtiformes
Family: Apogonidae
Subfamily: Apogoninae
Genus: Apogonichthys Bleeker, 1854
Species: Apogonichthys perdix Bleeker, 1854