Cartilaginous fish live all around the world, in all kinds of water – from rays that inhabit shallow, sandy bottoms to sharks that live out in the deep, open ocean.
Do cartilaginous fish live in freshwater?
Cartilaginous fish include sharks, rays, skates and chimaeras. There are approximately 600 different species of rays and skates and about 500 shark species. Rays and skates live in oceans throughout the world. … Some rays also live in freshwater.
What are 3 examples of cartilaginous fish?
Cartilaginous fishes (chondrichthyes) represent the oldest surviving jawed vertebrates and, as the name suggests, have a skeleton made out of cartilage. They include sharks, rays, and skates (elasmobranchii) and chimeras (holocephali).
How many cartilaginous fishes are there?
There are an estimated 934 species of cartilaginous fishes compared to about 22,000 species of ray-finned fishes.
Where are Chondrichthyans found?
Members of the Chondrichthyes can be found in nearly all aquatic ecosystems and depths, except the most extreme conditions. But most species are restricted to and specialised for a particular oceanic zone. For example, the skates (members of Rajidae) and angel sharks (Squatinidae) are benthic species.
Do cartilaginous fish have bones?
Introduction. Cartilaginous fishes (chondrichthyans) represent an ancient radiation of the gnathostome vertebrates characterized by having calcified cartilage but little or no bone internally, and rarely any in their scales. This group includes sharks, skates, and rays (Elasmobranchs), and chimaeras (Holocephali).
Which organ is absent in cartilaginous fish?
Chondrichthyes. Chondrichthyes Class of vertebrate animals characterized by a cartilaginous endoskeleton, a skin covered by placoid scales, the structure of their fin rays, and the absence of a bony operculum, lungs, and swim bladder.
Is Starfish a cartilaginous fish?
Answer: Though starfish are invertebrate, they have a kind of skeleton formed of calcium carbonate.
Is Cod a cartilaginous fish?
Fish are divided into two great groups: bony fish and cartilaginous fish. The bony ones like Cod and Salmon have hard bones. All the others have skeletons made of cartilage. … Common examples of cartilaginous fish are sharks, dogfish, rays and skates.
What are the features of cartilaginous fishes?
Other characteristics of cartilaginous fish include:
- Paired fins.
- Paired nostrils.
- Two-chambered hearts.
- Skeletons made of cartilage rather than bone. Cartilage is supportive tissue that does not have as much calcium as bones, which makes bones rigid. Cartilage is softer and more flexible than bone.
Do Petromyzontida have jaws?
The discussion below, for convenience, separates the modern “cyclostomes” into the class Myxini and class Petromyzontida. The defining features of the living jawless fishes are the lack of jaws and lack of paired lateral appendages (fins).
In what kind of habitat are skates and rays found?
While skates are typically found in more saline habitats (marine), rays are sometimes found in brackish estuary waters and freshwater lakes and rivers far inland from marine environments.
Is Catfish a cartilaginous fish?
A red tail catfish. Catfish are bony fish.
Do cartilaginous fish have operculum?
Their endoskeleton is primarily made of cartilage
On either side, they have 5 gills that are overly exposed, so they do not have an operculum. Their mode of fertilization is through internal mechanisms.
What are two major features of Chondrichthyans?
Key Features of Chondrichthyes
- Resemble bony fish and terrestrial vertebrates in having jaws and paired appendages.
- An electroreceptive system is well developed.
- Endoskeleton entirely cartilaginous.
- No swim bladder or lung.
What order are sharks in?
Data Quality Indicators:
|Class||Chondrichthyes – cartilaginous fishes, rays, sharks, condrictes, peixe cartilaginoso, tubarão, poissons cartilagineux, raies, requins|
|Subclass||Elasmobranchii – cartilaginous fishes, rays, sharks, skates, torpedoes|
|Order||Lamniformes – mackerel sharks|