The defining feature of these fish is their scales, which act like a suit of chainmail.
A is a type of primitive bony fish characterized by its heavy, diamond-shaped ganoid scales . Often referred to as "living fossils," these fish retain ancient skeletal features and armor-like protection that have largely been lost in more modern fish species. Key Characteristics of Ganoid Scales ganoid fish
: Found in Africa, these fish are some of the most primitive living ray-finned fishes. The defining feature of these fish is their
: In these species, the scales are often modified into large, bony plates called scutes rather than a full body covering. Key Characteristics of Ganoid Scales : Found in
: 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.
: 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 .