| Family | Scientific Name | Author | Year | Common Name |
| Eleotridae | Erotelis smaragdus | (Valenciennes) | 1837 | Emerald Sleeper |
Erotelis smaragdus
Unique Characters: Dark spot at upper pectoral fin base. Elongate caudal fin. Prominent, ventrally pointed spine on preopercle present, this spine may be difficult to see as it is often covered by skin. Scales cycloid and smooth, about 90 longitudinal rows. Body very slender, elongate, and terete, the depth contained 7-9 times in standard length.
Similar Species:
Fat Sleeper
Dormitator maculatus
Largescaled Spinycheek Sleeper Eleotris amblyopsis
Fat Sleeper Dormitator maculatus. Large, bluish blotch above base of dorsal fin. Dark lines radiate from eyes. Preopercular spine absent. Stout body.
Largescaled Spinycheek Sleeper Eleotris amblyopsis. Dorsum paler than sides. Rounded caudal fin. Prominent, ventrally pointed spine on preopercle present, this spine may be difficult to see as it is often covered by skin. Scales ctenoid and rough, 40-65 longitudinal rows. Body depth moderate.
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