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Most fish species with pharyngeal teeth do not have extendable pharyngeal jaws. A particularly notable exception is the highly mobile pharyngeal jaw of the moray eels.These are possibly a response to their inability to swallow as other fishes do by creating a negative pressure in the mouth, perhaps induced by their restricted environmental niche (burrows) or in the air in the intertidal zone. [10]
Monognathus, or onejaw, is the only genus of the family Monognathidae of deep-sea eels.The name comes from the Greek monos meaning "one" and gnathos meaning "jaw", a reference to the large mouth in comparison with the rest of the fish, and also the absence of an upper jaw (maxilla and premaxilla bones are absent).
Ilyophinae eels are caharcterised by having a lower jaw that is shorter than the upper jaw. In most taxa the upper body lacks scales and in some Dysomma species as well as Thermobiotes do not have a pectoral fin. They have depressed, relatively rounded heads with some rather long teeth. [1]
Dysommina rugosa is an eel in the family Synaphobranchidae (cutthroat eels). It was described by Isaac Ginsburg in 1951. [2] It is a marine, deep water-dwelling eel which is known from the western Atlantic and eastern central Pacific Ocean. It dwells at a depth range of 260–775 metres, and is found off the continental slope.
The jaws of the Kidako moray, or moray eels in general, hold a dual-jaw system for feeding. [10] They primarily use the oral jaws to deliver prey into the esophagus with sharp and piercing teeth. The teeth are curved backward and point towards its throat to avoid prey coming back out of its mouth. [ 13 ]
Channomuraena vittata is a rare species of moray eel from the Anguiliformes order found in reefs. It is commonly known as the broadbanded moray , banded moray , Chinese moray , double-ended moray , or the long-jawed moray.
Moray eel jaw anatomy. In addition to the presence of pharyngeal jaws, morays' mouth openings extend far back into the head, compared to fish which feed using suction. In the action of lunging at prey and biting down, water flows out the posterior side of the mouth opening, reducing waves in front of the eel which would otherwise displace prey.
The great sand eel can be distinguished from the lesser sand eel because the origin of its long dorsal fin is located behind the level of the pectoral fin. [5] Corbin's sand eel ( Hyperoplus immaculatus ) is very similar to the greater sand eel in the way that it lacks a protrusible upper jaw and its similar size.