Search results
Results from the WOW.Com Content Network
The lower jaw and maxilla (main upper fixed bone of the jaw) are then pulled back to close the mouth, and the fish is able to grasp the prey. By contrast, mere closure of the jaws would risk pushing food out of the mouth. In more advanced teleosts, the premaxilla is enlarged and has teeth, while the maxilla is toothless.
The upper jaw is toothless, but there are teeth on the roof of the mouth and on the lower jaw. A pair of moderately long barbels on the chin do not exceed the pectoral fins in length. The first dorsal fin has eight spines (the first one tiny) and the second dorsal fin has one spine and eight soft rays.
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.
There is no evidence for additional internal jaw bones such as coronoids or dermopalatines, which supplement the marginal jaw bones of bony fish. [1] Another difference from bony fish is that the three external jaw bones of Qilinyu are completely toothless and have an L-shaped cross-section. They have both a narrow vertical surface (facial ...
As a result, some males may consume their embryos rather than continuing to rear them under situations to regain energy in which their bodies are exhausted of resources. Pregnant male pipefish can absorb nutrients from their broods, in a manner very similar to filial cannibalism found in many other families of fish. The smallest eggs in a brood ...
The shortjaw cisco has large, smooth scales and is iridescent silver, with a greenish back and white belly. The mouth is small and toothless, and the lower jaw is shorter than or equal in length to the upper jaw. It typically weighs approximately 300 g (11 oz), and ranges from 150 to greater than 300 mm (6 to 12 inches) standard length.
In all jawed fish (gnathostomes), the first arch pair (mandibular arches) develops into the jaw, the second gill arches (the hyoid arches) develop into the hyomandibular complex (which supports the back of the jaw and the front of the gill series), and the remaining posterior arches (simply called branchial arches) support the gills.
Leedsichthys is an extinct genus of pachycormid fish that lived in the oceans of the Middle to ... The jaws are toothless. Behind the jaw joint a robust hyomandibula ...