Mandible: Jaw; one of a pair of mouthparts located behind the upper lip (labrum).
· Mandible = the section of the jaw where the teeth are placed, upper mandible and lower mandible3 ...
While there are some other fish (for instance many of the cyprinids) that have them, all catfish have barbels on the head: normally up to four pairs - one nasal, one maxillary, and two on the chin or lower jaw (mandible).
They will grip the edge of the shell with their mandibles and swim against it, pushing it into position; they will remove sand from underneath it to shift it; and lastly they will lie on the bottom strongly beating with their tail, ...
Maxillary palp - One of a pair of segmented appendages located between the mandibles of insects.
Mesonotum - The middle sclerotized plate on the top of the thoracic segments.
A complex set of muscles allows the upper and lower pharyngeal bones to be used as a second set of jaws for processing food, allowing a division of labour between the "true jaws" (mandibles) and the "pharyngeal jaws".
The Psychedelic wrasse is endemic to the area of the Hawaiian Islands, which is another way of saying that they aren't found anywhere else. They are characterized by their protruding front teeth on both the upper and lower mandibles, ...
or bacteria may be selected by some species, it is generally believed that all organic particles of suitable size are ingested without any selective mechanism. When undesirable material or large tangled masses are introduced between the mandibles, ...
 See also: Water, Species, Fish, Plants, Scale
  
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