[3] A single row of comb-like teeth are found on the dentary and premaxilla but are absent on the palatine bone.

[3] A blue coloration borders each eye and a dark-brown spot, similar in size to the diameter of the pupil, is located after the eyeball.

[6] Adult Ophioblennius trinitatis have a homogenous brown color pattern with pale yellow fins.

In stressful situations, the color pattern changes to a mix of irregular bands that alternate between dark and light.

[9] Ophioblennius trinitatis are commonly found in intertidal habitats and tropical coral reefs of Brazil at depths of up to 53 meters.

[9] Ophioblennius trinitatis prefer areas with substrate of high structural complexity and ample hiding places.

They employ agonistic displays when interacting with other highly territorial species that share similar habitat and food preferences.