The eyebrow like appendages called cirri are used to feel for pressure waves of potential predators.
Secretary blenny – Acanthemblemaria maria
Here the Secretary blenny has the cirri above the eye (a supraorbital cirrus.)
Acanthemblemaria maria lives in a hole in a colonial coral or an empty serpulid worm tube. It is often associated with small brain corals, sea fans, sea whips and sea urchins. They are an ambush predator, remaining concealed in its lair with only its head projecting, until a copepod or other small invertebrate prey approaches. At this stage, it darts out, grabs the prey and retreats into its home. The eggs are laid in the lair and are tended by the male, the female taking no part in their care.
Acanthemblemaria: Greek akantha = ‘thorn’ + Greek, emblema, –atos = ‘anything that is nailed, knocked in’
maria: Latin = ‘Mary’
Cirri – Latin cirrus = ‘a curl-like tuft or fringe’