Lower In vertebrates, the lower jaw (mandible or jawbone) is a bone forming the skull with the cranium. In lobe-finned fishes and the early fossil tetrapods, the bone homologous to the mandible of mammals is merely the largest of several bones in the lower jaw. It is referred to as the dentary bone, and forms the … See more Most bony fishes have two sets of jaws made mainly of bone. The primary oral jaws open and close the mouth, and a second set of pharyngeal jaws are positioned at the back of the throat. The oral jaws are used … See more Cartilaginous fishes (sharks, rays and skates) have cartilaginous jaws. The jaw's surface (in comparison to the vertebrae and gill arches) needs extra strength due to its heavy exposure to … See more Salmon Male salmon often remodel their jaws during spawning runs so they have a pronounced curvature. These … See more The skull of fishes is formed from a series of loosely connected bones. Lampreys and sharks only possess a cartilaginous endocranium, with … See more Pharyngeal jaws are a second set of jaws distinct from the primary (oral) jaws. They are contained within the throat, or pharynx, of most bony fish. They are believed to have originated, in … See more Jaws provide a platform in most bony fish for simple pointed teeth, however, there are many exceptions. Some fish like carp and See more The appearance of the early vertebrate jaw has been described as "a crucial innovation" and "perhaps the most profound and radical evolutionary step in the vertebrate history". Fish without jaws had more difficulty surviving than fish with jaws, and most … See more WebMay 28, 2015 · Gogoselachus cartilage showing the separate units called tesserae making the up the lower jaw (left), and a thin section showing bone cells (red line) inside the matrix which binds the tesserae ...
29.2B: Gnathostomes - Jawed Fishes - Biology LibreTexts
WebOct 20, 2016 · A 425-million-year old placoderm fish, Qilinyu, reveals how the vertebrate jaw first evolved and why most placoderms have totally different jaws relative to all other … WebDec 26, 2024 · Three degrees of freedom in a bass jaw allows for fine tuned strikes in any direction. But why study a bass? ... Then we CT-scan the fish and align each scanned bone with the X-ray video, using ... flow velocity formula pipe
Fish anatomy - Wikipedia
WebAug 1, 2024 · The pharyngeal jaws of the black drum have several unique morphological features compared to other durophagous bony fish, including an increase in force transmission of the jaws that is achieved by the formation of an enlarged dental-plate (Liem and Kaufman, 1984).At the macro-level the architecture of the bony tooth plate of the … WebOriginally the quadrate and articular bones formed the jaw joint, but these synapsids (e.g., Probainognathus) evolved a second pair of bones involved in the jaw articulation. The … WebJan 28, 2024 · Scientists are surprised with the black drum’s super jaw because, unlike most jaws made of cortical bone, black drums possess jaws that have 3D-arranged beams. … green cotton vs organic cotton