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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".
The species level taxonomy is complex and the family includes several undescribed species. 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 ...
Osteichthyes (bone-fish) or bony fishes are a taxonomic group of fish that have bone, as opposed to cartilaginous skeletons. The vast majority of fish are osteichthyans, which is an extremely diverse and abundant group consisting of 45 orders, with over 435 families and 28,000 species. [21] It is the largest class of vertebrates in existence today.
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] Opistognathus albicaudatus Smith-Vaniz, 2011 (White-tail jawfish) [3] Opistognathus alleni Smith-Vaniz, 2004 (Abrolhos jawfish)
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]
In most species, the upper jaw reaches its full length only in adults, so the juveniles have a half-beak appearance, with an elongated lower jaw, but a much smaller upper one. During this stage of their lifecycle, they eat plankton, switching to fish once the beak fully develops. Needlefish reproduce through mating and laying eggs.
Lasiognathus, the wolftrap anglerfish, is a genus of deep-sea anglerfish in the family Thaumatichthyidae, with six species known from the Atlantic and Pacific Oceans.. Like its sister genus Thaumatichthys, it is distinct from other anglerfish for an enormous upper jaw with premaxillaries that can be folded down to enclose the much shorter lower jaw. [1]
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]