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).
What are 5 examples of cartilaginous fish?
Cartilaginous Fish
- Blacktip Reef Shark.
- Bonnethead Shark.
- Electric Rays.
- Epaulette Shark.
- Great White Shark.
- Leopard Shark.
- Nurse Shark.
- Rays.
What is bony and cartilaginous fish?
Cartilaginous fishes have skeletons composed mostly of cartilage while bony fish have a skeleton composed mostly of bone. Furthermore, these two types of fish fall under different taxonomic groups – Cartilaginous fish are grouped under the class Chondrichthyes and all bony fish fall under the superclass Osteichthyes.
What are the characteristics of a cartilaginous fish?
Cartilaginous Fish
- Paired fins.
- Paired nostrils.
- Scales.
- 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.
What are cartilaginous fishes called? – Related Questions
What is an example of a cartilaginous?
The joint between the manubrium and the sternum is an example of a cartilaginous joint. This type of joint also forms the growth regions of immature long bones and the intervertebral discs of the spinal column.
Where are cartilaginous fish found?
The class Chondrichthyes consists of the cartilaginous fishes, including sharks, batoids (rays, skates, guitarfish, and sawfishes), and chimaeras, or ratfishes. A diverse group comprising more than 700 species, Chondrichthyans are found throughout the world’s oceans and in some freshwater environments.
What are 3 characteristics of a bony fish?
Class – Osteichthyes
Bony fishes share several distinguishing features: a skeleton of bone, scales, paired fins, one pair of gill openings, jaws, and paired nostrils.
What are 2 features that cartilaginous fish and bony fish have in common?
Both bony fish and cartilaginous fish have an endoskeleton. Both bony fish and cartilaginous fish breath through gills. Both bony fish and cartilaginous fish possess a mouth with jaws.
What’s special about a cartilaginous fish’s scales?
Placoid scales (or denticles) are spiny, toothlike projections seen only in cartilaginous fishes. Ganoid scales, sometimes considered a modification of the placoid type, are chiefly bony but are covered with an enamel-like substance called ganoin. These rather thick scales, present in some primitive bony fishes,…
What are 5 important features of chondrichthyes?
5 important features of Chondrichthyes:
- Presence of a cartilaginous endoskeleton.
- The mouth is placed ventrally.
- The notochord exists throughout life.
- The operculum does not cover the gills.
- The absence of an air bladder.
What is the common name for 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 Chondrichthyes give 2 examples?
Chondrichthyes is a class of jawed fishes having a cartilaginous skeleton. The class includes a diverse group of fishes including sharks, rays, skates and chimaeras. They are mostly marine fishes.
Is Chondrichthyes warm or cold blooded?
Their endoskeleton is made of cartilage. Chondrichthyes are known as cold-blooded animals. They are unable to regulate their internal body temperature.
Can Chondrichthyes live in freshwater?
Most chondrichthyans are marine species. Only 5% (approximately 45 species) are restricted to freshwater, such as the giant freshwater stingray, Himantura chaophraya (Fowler et al., 2005; Helfman et al., 2009). Others enter estuaries and freshwater sporadically, often to breed.
Is shark heat or cold?
Are sharks warm or cold blooded? Most sharks, like most fishes, are cold blooded, or ectothermic. Their body temperatures match the temperature of the water around them. There are however 5 species of sharks that have some warm blooded, or endothermic capabilities.
Why do Chondrichthyes always swim?
Members of Class Chondrichthyes are marine with streamlined body having cartilaginous endoskeleton. Due to the absence of air bladder, they have to swim constantly to avoid sinking.
Do Chondrichthyes have teeth?
Final Answer: Yes, Chondrichthyes have teeth, however, they’re comprised of calcified cartilage rather than bone.
Do Chondrichthyes lay eggs or give birth?
Although these animals produce eggs, they don’t lay them. Instead, the young hatch while still in the female’s body and are born as miniature adults. This is known as ovoviviparity.
How old is Chondrichthyes?
Chondrichthyans (including living sharks, skates, rays and chimaeras) have a fossil record of scales and dermal denticles perhaps dating back to the Late Ordovician period, about 455 million years ago.
What is the smallest cartilaginous fish?
Cartilaginous fish, such as sharks and rays also lack a true maxilla. There are over 980 species of cartilaginous fish. Possibly the smallest cartilaginous fish, the smallest known adult finless sleeper ray measured only 8.2cm in long and weighed 13 g oz.