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They are bottom-dwelling fish, found down to about 800 m (2,600 ft) depth. Most are relatively small fish, although one species, Polymixia berndti, is over 40 cm (16 in) in length. [3] The earliest body fossils are from the Late Cenomanian of Lebanon, of the genus Pycnosteroides. [4]
In the upper jaw there are four teeth in the inner series and six in the outer series. In the lower jaw, there are four to six in an outer series only. The snout is tapered and projecting and the eyes are located high on the head. Filefish have rough non-overlapping scales with small spikes, which is why they are called filefish.
After the appearance of jawed fish (placoderms, acanthodians, sharks, etc.) about 420 million years ago, most ostracoderm species underwent a decline, and the last ostracoderms became extinct at the end of the Devonian period. More recent research indicates that fish with jaws had far less to do with the extinction of the ostracoderms than ...
These fish can display homing behaviour and are normally found no deeper than the lower limit for the growth of green algae, around 20 metres (66 ft). They are predatory fish and the major part of their diet is crustaceans but they will eat polychaetes, gastropods and small fish, they have also been recorded consuming algae. The five-bearded ...
Brotula barbata, commonly known as the bearded brotula, Atlantic bearded brotula, or sugarfish, is a species of cusk-eel in the genus Brotula. It lives in the Atlantic Ocean, in depths of up to 300 meters. Its coloring ranges from olive-brown to red-brown, and it grows up to be around 50 centimeters. It has a carnivorous diet, and it is oviparous.
Pseudancistrus barbatus, [1] commonly known as the bearded catfish, is a species of catfish in the family Loricariidae. It is native to South America , where it occurs in the basins of the Oyapock , the Mana River , the Maroni , the Suriname River , the Courantyne River , and the Essequibo River .
Scorpaenopsis barbata, the bearded scorpionfish, is a species of venomous marine ray-finned fish belonging to the family Scorpaenidae, the scorpionfishes. This species is found in the Indian and Pacific Oceans .
In some species such as Barbatia, this outer horny covering is tufted at the end of the shell into something that resembles a beard, hence the name Barbatia or bearded one. The thick outer skin or periostracum of an ark clam can act as camouflage, such that the shells can sometimes look like stones when lying on the bottom.