It has a small protractile mouth with a black, burglar-like mask around its eyes.

The mouth is also usually not truly protractile.

The mouth is superior, highly protractile, armed with tricuspid teeth.

This fish shows large eyes, a quite long snout and a very protractile mouth, that forms a short tube when extended.

They usually have large heads, cryptic colors and very large protractile mouths.

They have protractile mouths, usually with separate jaw teeth that jut outwards.

These fish usually have small heads, coloration that appears to have evolved to resemble leaves, and very large protractile mouths.

The species uses its protractile jaws to suck out prey from the sand or reef, and consumes a variety of fish, crustaceans and molluscs.

The upper jaw is highly protractile, containing narrow bands of villiform teeth, which become obsolescent with age, as is the case in the lower jaw.

Many predatory mammals have protractile claws that can partially hide inside the animal's paw, especially the Felidae, where almost all of its members have fully protractible claws.

The species' mouth is one of its defining features; the mouth is highly protractile and fleshy, with specimens greater than 90 mm having no teeth on the jaws, vomer or tongue.

The upper jaw's protrusion is achieved in a unique way: the maxilla, instead of being ligamentously attached to the ethmoid and palatine, slides in and out with the highly protractile premaxilla.

The highly protractile mouth possessed by the species is used to form a tube to suck prey out of both reef and algae dominated habitats as well as filtering organisms out of sandy substrates.

They were formerly considered near allies of the pikes and their relatives, as they share some features: a flat head with protractile mouth beset with cardiform, villiform, or compressed, bi- or tri-cuspid teeth, generally large scales, and the absence of a well-developed lateral line.