| Apogon erythrinus | |
|---|---|
 | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Actinopterygii |
| Order: | Gobiiformes |
| Family: | Apogonidae |
| Genus: | Apogon |
| Species: | A. erythrinus |
| Binomial name | |
| Apogon erythrinus Snyder, 1904 | |
Apogon erythrinus, [1] also called Hawaiian ruby cardinalfish, is a marine fish species endemic to Hawaii. It belongs to the family Apogonidae and the subfamily Apogoninae. [2]
The Hawaiian ruby cardinalfish is a relatively small red fish with a somewhat transparent appearance. They can grow up to 1.57 in (4.0 cm). [3] They have a second dorsal fin spine that reaches at least to the base of the third ray of their second dorsal fin when depressed, and they have 14 pectoral fin rays. [4] They live for about four months. [5]
The Hawaiian ruby cardinalfish is endemic to the Hawaiian islands. [6] These fish are very shy, nocturnal, and prefer to hide in and patrol along holes and crevices. [6]
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