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The enameloid is single-layered, overlaying the thick mantle of orthodentine. [14] In addition to the dentition teeth, there are also a number of buccopharyngeal denticles lining the oropharynx. [ 11 ] [ 14 ] The denticles lining the top of the head and the top of the spine-brush complex are larger than the dentition teeth, and they appear as ...
A single tooth row includes one or more functional teeth at the front of the jaw, and multiple replacement teeth behind this. [20] For example, the jaws of a bull shark can have 50 rows of teeth in 7 series, with the outermost series functional, but most sharks have five series with the average shark having about 15 rows of teeth in each jaw ...
The necklace carpetshark (Parascyllium variolatum), also known as the varied carpetshark, is a carpetshark of the family Parascylliidae endemic to the waters off Australia's southern coast between latitudes 37°S and 41°S. It is found near the ocean floor over sand, rock, coral reefs, and kelp and seagrass beds at depths down to 180 m (590 ft ...
Xenacanthida (or Xenacanthiformes) is an order or superorder of extinct shark-like chondrichthyans (cartilaginous fish) known from the Carboniferous to Triassic. They were native to freshwater, marginal marine and shallow marine habitats. [1] Some xenacanths may have grown to lengths of 5 m (16 ft). [2]
This is a typical Cladodont tooth, of a shark called Glikmanius. Cladodont (from Latin cladus, meaning branch and Greek Odon, meaning tooth) is the term for a common category of early Devonian shark known primarily for its "multi-cusped" tooth consisting of one long blade surrounded by many short, fork-like tines, designed to catch food that was swallowed whole, instead of being used to saw ...
Odontaspis (from Greek: ὀδούς odoús 'tooth') and Greek: ἀσπίς aspís 'shield') [2] is a genus of sand shark with two extant species. Description
The teeth similar to those of the modern Tiger shark, but are smaller, with a more central cusp that projects farther from the base of the tooth. The species of Physogaleus were originally described as belonging to the same genus as the modern Tiger shark , Galeocerdo .
Generally, tooth development in non-human mammals is similar to human tooth development. The variations usually lie in the morphology, number, development timeline, and types of teeth. [8] However, some mammals' teeth do develop differently than humans'. In mice, WNT signals are required for the initiation of tooth development.