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Fish Skin and Scales

TermDefinition
Placoid scales Chondrichthyan scales Similar to mammalian teeth keeled edges reduce drag
Cosmoid scales Thick, bony scales Fused placoid scales Fossil coelacanths and fossil lungfishes have these
Modified Cosmoid scales No dentine layer Have 2 layers of bone and thin layer of enamel
Ganoid scales Form armor rhomboidal in shape have a ball and socket joint
Cycloid scales First observed in primitive teleosts Overlap like shingles Looks like an oval doing the paper wobbling sound Greater flexibility than ganoid and cosmoid
Ctenoid scales Found in most evolutionarily advanced fish Overlap like shingles Greater flexibility than ganoid and cosmoid Thinner than cycloid and ganoid scales
Ctenii Teeth-like projections on the posterior part of the ctenoid scale
Circuli individual rings on the ctenoid scale
Mucus Hagfish defense mechanism Produced by skin Made of proteins and carbohydrates Rapidly expands when encountering water
Placoid Made of dentine Has a pulp cavity Contains capillaries
Cycloid and Ctenoid The types of scales used for age estimation
Skin Function Protect against pathogens mucus production sensory cells relatively impermeable to water and ion diffusion
Created by: barthurs
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