The sharks, rays, and chimaeras make up the second group of fish, the Class Chondrichthyes. Sharks are one of the earliest known jawed fishes. They have an upper and lower jaw made of cartilage.
What defines a fish as a Chondrichthyes?
iːz/; from Ancient Greek: χονδρ- chondr- ‘cartilage’, ἰχθύς ichthys ‘fish’) is a class that contains the cartilaginous fishes that have skeletons primarily composed of cartilage . ... Chondrichthyes are jawed vertebrates with paired fins, paired nares, scales, and a heart with its chambers in series.
What type of animals are Chondrichthyes?
Sharks, skates, rays, and even stranger fish make up the Chondrichthyes, or “ cartilaginous fish .” First appearing on Earth almost 450 million years ago, cartilaginous fish today include both fearsome predators and harmless mollusc-eaters (harmless, that is, unless you are a mollusc).
Are most fish Chondrichthyes?
chondrichthyan, (class Chondrichthyes), also called chondrichthian, any member of the diverse group of cartilaginous fishes that includes the sharks , skates, rays, and chimaeras.
What are the 4 types of cartilaginous fishes?
Cartilaginous fish include sharks, rays, skates and chimaeras .
Which organ is absent in cartilaginous fish?
The swim bladder is similar to human lungs in the way that it expands and deflates. Chondrichthyes (cartilaginous fish) use an oil filled liver to control their buoyancy instead of the swim bladder.
What are 3 types of fish?
Fishes are typically divided into three groups: superclass Agnatha (jawless fishes), class Chondrichthyes (cartilaginous fishes) , and superclass Osteichthyes (bony fishes).
Are chondrichthyes Amniotes?
Includes Myxini, Cephalaspidomorpha, Chondrichthyes, Osteichthyes, Amphibia. Amniotes – vertebrates that possess an amnion. Includes Reptilia, Aves, Mammalia.
What makes chondrichthyes unique?
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 kind of fish is a shark?
Sharks are a special type of fish known because their body is made out of cartilage instead of bones like other fish. The classification of this type of fish is “ elasmobranch .” This category also includes rays, sawfish, and skates.
What separates sharks from other fish?
But how is a shark different from other kinds of fish? Most other fish have skeletons made of bone. A shark’s skeleton is made of cartilage, a type of strong but flexible tissue. Most other fish are covered in smooth, flat scales.
What are the 3 types of bony fish?
Living Osteichthyes are divided into three subclasses: Dipnoi, Crossopterygii, and Actinopterygii .
Why are sharks cartilaginous fish?
Cartilaginous skeleton
Sharks, rays, skates, and chimaeras (also know as rat fishes) all have cartilaginous skeletons. Cartilage is less dense than bone , allowing sharks to move quickly through the water without using too much energy.
Do we eat cartilaginous fish?
Sharks and Skates as Seafood? While smooth dogfish may not be on your list of favorite seafood, cartilaginous fish (mainly sharks and skates) may increasingly find their way onto your dinner plate due to the decline of more traditional fisheries.
How long do cartilaginous fish live?
How Long Do Cartilaginous Fish Live? Some cartilaginous fish may live for up to 50-100 years .
Is a puffer fish a cartilaginous fish?
They differ from cartilaginous fish because they have bone skeletons and a swim bladder that helps them float. ... Although they come in many shapes, most bony fish species have fusiform, hydrodynamic bodies, which allow them to cruise through the water at high speeds.
