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Fish scales are smooth to help them glide through the water, and some reflect light to help camouflage them underwater. Unlike reptiles, the scales of bony fish are made of enamel and dentine (like teeth) and they can be detached individually from the skin.A reptile’s scales are in the epidermis of the skin whereas a fish’s scales are in the dermis of the skin, which is located underneath the epidermis.Most reptiles and fish bear scaly outer coverings, although exceptions exist in both categories. For example, catfish have no external scales and snakes occasionally exhibit a genetic mutation in which they fail to produce scales.
What is the difference between fish and reptile scales?
A reptile’s scales are in the epidermis of the skin whereas a fish’s scales are in the dermis of the skin, which is located underneath the epidermis.
Do reptiles and fish have scales?
Most reptiles and fish bear scaly outer coverings, although exceptions exist in both categories. For example, catfish have no external scales and snakes occasionally exhibit a genetic mutation in which they fail to produce scales.
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What is the difference between a reptile and a fish?
A fish is an animal that lives only in the water, whereas a reptile lives in both land and water. A fish is an aquatic vertebrate that is cold blooded or ectothermic. The reptile is also a cold blooded animal that is covered by scutes or scales.
Are scales of a fish and that of a snake similar?
Answer. Fish scales and reptile scales are not homologous meaning that they do not arise from the same embryonic tissues. Fish have scales that arise from dermal bony tissue and have a somewhat similar composition to bone. These scales form from the epidermis, somewhat like those of snakes and lizards do.
Do reptiles have scales?
Reptiles have dry, scaly skin. But they don’t need moisturizer! Their special covering actually helps them hold in moisture and lets them live in dry places. Reptile scales are not separate, detachable structures — like fish scales.
What is the function of scales in fishes and reptiles?
Fish scales primarily serve two purposes: protection and locomotion. What distinguishes these various scales from each other is both their composition and how they balance those two functions. The more ancestral a scale, the better its configuration is for protection rather than locomotion (1).
Do fish have scales?
Many fish have an outer covering of scales. Scales protect fish, much like a suit of armor. All fish have a slimy covering of mucus. This substance allows the fish to swim through the water with very little drag and also makes it difficult for other organism to attach to the fish.
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Fish scales are dermally derived, specifically in the mesoderm. This fact distinguishes them from reptile scales paleontologically.
Are all fish reptiles?
Fish are considered animals, but they are not reptiles. Specific characteristics need to be met for an organism to be classified as an animal.
Which type of body covering is characteristic of both reptiles and fish?
One of the main characteristics that is used to distinguish one class of animals from another is type of skin covering. Mammals have hair or fur, birds have feathers, reptiles have dry scales, amphibians have soft, moist skin, and fish have wet, slimy scales.
What do fish and amphibians have in common?
Already you may notice some similarities with fish. Both groups have gills and fins for at least part of their lives, though most amphibians lose their aquatic traits as adults. They both also have skin and eggs that need to remain moist, and rely on water for reproduction.
Do reptiles have gills?
Instead of possessing gills like fish or amphibians, reptiles have lungs for breathing. The United States is home to a diverse range of reptiles. Today these animals face threats including habitat destruction, pollution, and overexploitation.
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How do amphibians differ from fishes?
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Difference Between Fish and Amphibians.
| Fish | Amphibians |
|---|---|
| More species in saltwater than freshwater | Aquatic species are mostly inhabit freshwater than saltwater |
| Scale covered skin | No scales, but moist skin |
Which reptiles have scales on their bodies?
In lizards and snakes, the whole skin is covered in overlapping epidermal scales and in turtles and crocodiles in dermal scutes. The cornified part of the epidermis is strengthened by β-keratin and sometimes α-keratin.
Does lizard have scales?
Except for openings of nostrils, mouth, eyes, and cloaca, most lizards are completely covered in scales. Scales may be smooth and overlapping, form a mosaic of flat plates, or have keels or tubercles. The arrangement varies among species and by body part.
Are reptiles warm blooded?
Most reptiles today are cold-blooded, meaning their body temperature is determined by how warm or cold their surroundings are.
How many scales does a fish have?
There are four types of fish scales – placoid, cycloid, ctenoid (pronounced ‘ten-oid’), and ganoid. Most bony fish have cycloid scales. Fish with cycloid scales have the same number of scales their entire lives – the scales enlarge to accommodate a fish’s growth (scales that are lost to injury will be regrown).
Why do fish have smooth scales?
Scales protect fish from predators and parasites and reduce friction with the water. Multiple, overlapping scales provide a flexible covering that allows fish to move easily while swimming.
What is the function of scales in fish?
Scales provide protection from the environment and from predators. Fish scales are formed of bone from the deeper, or dermal, skin layer. The elasmobranchs (e.g., sharks) have placoid scales, which are bony, spiny projections with an enamel-like covering.
Do fish have skin under scales?
Fish without scales usually evolve alternatives to the protection scales can provide, such as tough leathery skin or bony plates. Jawless fish (lampreys and hagfishes) have smooth skin without scales and without dermal bone.
Why do some fish not have scales?
Fishes that don’t have scales include the clingfish, catfish, and shark family, among others. Instead of scales, they have other layers of material over their skin. They can have bony plates that are also covered by another layer or tiny, teeth-like protrusions covering their skin.
Why do reptiles have scales?
Reptiles have a tough, dry, scaly skin that protects them from predators and allows them to live in dry places by reducing water loss. Reptilian scales are made of keratin, like hair, and found in an overlapping arrangement. This creates a sort of environmental shield for the animal.
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How do scales form in fish?
Fish scales are derived from the dermal layer of tissue where reptile scales rise from the epithelial tissue, which also allows them to regenerate faster.
What is fish skin called?
The thin, translucent bony scales of modern fishes, called cycloid and ctenoid (the latter distinguished by serrations at the edges), lack enameloid and dentine layers. Skin has several other functions in fishes.
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