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• Whale sharks have been found to possess dermal denticles on the surface of their eyeballs that are structured differently from their body denticles.
• Fossil denticles (tooth-like scales in the skin) resembling those of today's chondrichthyans date at least as far back as the Ordovician, with the oldest unambiguous fossils of cartilaginous fish dating from the middle Devonian.
• Their skin is smooth and relatively free of scales or unique features, lacking the keeled, tooth-like placoid scales (denticles) present on sharks and rays.
• The rachiglossate (rasp-like) radula, a layer of serially arranged teeth within the mouth, has only three denticles (small teeth) in each transverse row.
• The skull of Euoplocephalus can be distinguished from most other ankylosaurids by several anatomical details, including: the pattern of bony sculpturing in the region in front of the eyes; the form of the palpebral bones (small bones over the eyes), which may have served as bony eyelids; the medial curve of the tooth rows in the upper jaw; and the teeth, which are relatively small, lacking true cingula, and having variable fluting of the denticles.
• They rasp at the flesh using their radula, a rough tongue-like organ that has thousands of tiny denticles (tooth-like protrusions).
• It has a dominant central protocone flanked by denticles that decrease in size mesially and distally, resulting in a tooth with a triangular profile.
• Henodus, however, differs from other placodonts in having developed unique baleen-like denticles, which alongside features of the hyoid and jaw musculature suggest that it was a filter feeder.
• The maxillary teeth have no serrations on their front edge; the denticles on the concavely curved rear edge are small.
• In addition to the dentition teeth, there are also a number of buccopharyngeal denticles lining the oropharynx.
• Like all stegosaurians, the denticles on the teeth are rounded at the tips, in contrast to ankylosaurians.
• In 2024, a comprehensive analysis of early ornithischian evolution found Ferganocephale to be most similar to Chaoyangsauridae in overall morphology but refrained from referring it to this clade based on its lack of denticles and strength of the cingulum.
• The teeth were lanceolate and furnished with coarse denticles; therewith they resemble those of prosauropods more than those of sauropods.
• They lack the dorsal denticles (sharp, tooth-like scales) of other rays, hence their name, from Greek an- meaning "without", acantha meaning "thorn", and bathys meaning "deep".
• It had small leaf-shaped cheek teeth (triangular and with small ridges and denticles lining the front and back edges), and premaxillary teeth with less ornamentation.
• The leaf-shaped teeth are asymmetrical, with the majority of the denticles on the edge closest to the tip of the snout and large furrows on the cingula.
• Initially described as a basal ornithischian dinosaur, subsequently reclassified as a member of the clade Archosauriformes of uncertain phylogenetic placement and later, taking into account the similarity of its teeth to the teeth of traversodontid cynodonts such as Dadadon (shared presence of teeth with sub-triangular crowns, enlarged denticles, and thecodont tooth implantation), as an amniote of uncertain affinities (though based on dissimilarities in gross morphology and geographic separation it is still more likely that the taxon is indeed an archosauriform rather than a traversodontid).
• While it had a long rostrum with large denticles similar to sawfishes and sawsharks, its closest living relatives are actually skates.
• However Schaeffer differentiated Chinlea from Dilpurus by its greater posterior extension of the supratemporal; increased ossification of the extrascapulars; a robust antroventral process on the lateral rostral; larger and triangular postorbital; longer dentary with notched posterior border; anteriorly narrowed angular; small, numerous, closely spaced teeth on dentary; large, tusk-like teeth on premaxilla dermopalatine, possibly ectopterygoid, and precoracoid; and no denticles on anterior borders of the dorsal and caudal fins.
• Galeus is a genus of deepwater catshark, belonging to the family Pentanchidae, commonly known as sawtail catsharks in reference to a distinctive saw-toothed crest of enlarged dermal denticles, found along the upper edges of their caudal fins.

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