Ganoid | Fish

Today, only a few groups of fish still possess these primitive scales:

: Due to their thick, bony nature, these scales make the fish's body relatively rigid compared to more modern teleost fish. Representative Living Species

: Unlike the overlapping "shingle-like" scales of common fish, ganoid scales are rhomboidal and connect via peg-and-socket joints . This creates an interlocking, nearly impenetrable surface that is highly resistant to predators. ganoid fish

: In these species, the scales are often modified into large, bony plates called scutes rather than a full body covering.

: Each scale consists of three distinct layers: a bony basal layer, a middle layer of dentine (similar to human teeth), and a hard, enamel-like outer layer called ganoine . Today, only a few groups of fish still

: Species like the Alligator Gar are famous for their diamond-shaped armor.

The defining feature of these fish is their scales, which act like a suit of chainmail. : In these species, the scales are often

: Found in Africa, these fish are some of the most primitive living ray-finned fishes.