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Ophiacodon (meaning "snake tooth") is an extinct genus of synapsid belonging to the family Ophiacodontidae that lived from the Late Carboniferous to the Early Permian in North America and Europe. The genus was named along with its type species O. mirus by paleontologist Othniel Charles Marsh in 1878 and currently includes five other species. [ 1 ]
The dental lamina is a band of epithelial tissue seen in histologic sections of a developing tooth. [ 1 ] [ 2 ] The dental lamina is first evidence of tooth development and begins (in humans) at the sixth week in utero or three weeks after the rupture of the buccopharyngeal membrane.
New, permanent teeth grow in the jaws, usually under or just behind the old tooth, from stem cells in the dental lamina. [5] Young animals typically have a full set of teeth when they hatch; there is no tooth change in the egg. Within days, tooth replacement begins, usually in the back of the jaw continuing forward like a wave.
Common names: advanced snakes. The Alethinophidia are an infraorder of snakes that includes all snakes other than blind snakes and thread snakes.Snakes have long been grouped into families within Alethinophidia based on their morphology, especially that of their teeth.
It is usually worn away by mastication and cleaning. The primary enamel cuticle protects enamel from resorption by cells of the dental sac and also secretes desmolytic enzymes for elimination of the dental sac, allowing fusion between reduced enamel epithelium and oral epithelium. This process allows eruption of the tooth without bleeding.
Most other squamate reptiles have pleurodont dentition, though some snakes are occasionally described as having acrodont dentition. [5] [6] Rhynchocephalia: Acrodont tooth implantation is common within Rhynchocephalia, including Sphenodon. [7] Amphibia: Acrodont tooth implantation also present in some frogs and the temnospondyl Microposaurus ...
[2] The word Trimorphodon is a combination of three Greek words, 'tri' - three, 'morph' - shape, and 'odon' - teeth, which refers to the three distinct kinds of teeth that lyre snakes have: recurved anterior teeth; shorter middle teeth, and large grooved fangs at the rear of the jaw.
The Gempylidae are a family of scombriform ray-finned fishes commonly known as snake mackerels or escolars. The family includes about 25 species. The family includes about 25 species. They are elongated fishes with a similar appearance to barracudas , having a long dorsal fin , usually with one or finlets trailing it.