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Physically similar to blennies, most jawfish species are small fish (up to 10 cm or 3.9 in) with an elongated body plan. A few species, for example the aptly named giant jawfish (O. rhomaleus), reaches about 0.5 m (1 ft 8 in). Their heads, mouths, and eyes are large in size relative to the rest of their bodies.
The upper jaw, or maxilla [12] [13] is a fusion of two bones along the palatal fissure that form the upper jaw. This is similar to the mandible (lower jaw), which is also a fusion of two halves at the mandibular symphysis. In bony fish, the maxilla is called the "upper maxilla," with the mandible being the "lower maxilla".
Oplegnathus punctatus, commonly known as the spotted knifejaw, is one of seven species in the Oplegnathidae family of knifejaws. These perciform fish, an order of ray-finned fish that are "perch-like", characteristically have teeth fused into a parrot-like beak during adulthood.
There are currently 72 recognized species in this genus: Opistognathus adelus Smith-Vaniz, 2010 (Obscure jawfish) [2]; Opistognathus afer Smith-Vaniz, 2010 (African jawfish) [2]
Jawless fish and sharks only possess a cartilaginous endocranium, with the upper and lower jaws of cartilaginous fish being separate elements not attached to the skull. Bony fishes have additional dermal bone, forming a more or less coherent skull roof in lungfish and holost fish. The lower jaw defines a chin.
The barred knifejaw (Oplegnathus fasciatus), also known as the striped beakfish or rock bream, is a species of marine ray-finned fish, from the family Oplegnathidae.It is commonly native to the north-western Pacific Ocean, though a smattering of records exist from other localities in the eastern Pacific such as Hawaii and Chile.
Yellowhead jawfish have two different types of responses to intruders, flight or fight. The type of response depends on the type of incoming fish. During flight, the fish will swim away from the intruder and in go into their burrow, covering the opening with a large rock. During fight, the fish will spit sand or rocks at the intruder. [4]
Oplegnathus is currently the sole recognized genus in the knifejaw family (Oplegnathidae) of marine centrarchiform ray-finned fishes. [5] The largest, the Cape knifejaw, can reach a maximum length around 90 cm (35 in).
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