What is unique to Chondrichthyes?
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 are the key characteristics of class Chondrichthyes?
Species in this class have paired fins, hard scales, a two-chambered heart, and a pair of nostrils. Most species have 5-7 gill slits on each side of their body. Some species produce egg cases, others give birth to live young.
What are some distinguishing characteristics of cartilaginous fish?
- The cartilaginous fish are jawed fish with paired fins, paired nostrils, scales, two-chambered hearts, and skeletons made of cartilage rather than bone.
- Examples of the cartilaginous fish include sharks , rays, and skates.
How are Chondrichthyes differ from osteichthyes?
The main difference between Chondrichthyes and Osteichthyes is that the Chondrichthyes is the class of bony fish whose endoskeleton is made up of cartilages whereas Osteichthyes is the class of cartilaginous fish whose endoskeleton is made up of bones.
How do osteichthyes differ from the Agnatha and Chondrichthyes?
Osteichthyes. The third major group of fish is the Osteichthyes or the true bony fish, which is divided into two classes. The bony fish differ from the Agnatha because they have jaws. The bony fish differ from the Chondrichthyes because the bony fish have skeletons made of bone.
How are chondrichthyes differ from osteichthyes?
What are the main characteristics of osteichthyes?
Class – Osteichthyes Bony fishes share several distinguishing features: a skeleton of bone, scales, paired fins, one pair of gill openings, jaws, and paired nostrils. Osteichthyes includes the largest number of living species of all scientific classes of vertebrates, more than 28,000 species.
What are the differences between chondrichthyes and osteichthyes?
What are the differences between bony and cartilaginous fish?
However, the most obvious disparity between the two types of fish is the composition of their skeleton. As the name suggests, “bony fish” have a skeleton composed of only bones while a cartilaginous fish has a skeleton made entirely of cartilage.
Which characteristic differentiates Class Chondrichthyes from class Osteichthyes?
What are the characteristics of Osteichthyes?
Class – Osteichthyes Like all fishes, Osteichthyes are cold-blooded vertebrates that breathe through gills and use fins for swimming. Bony fishes share several distinguishing features: a skeleton of bone, scales, paired fins, one pair of gill openings, jaws, and paired nostrils.
What are the characteristics of a chondrichthye fish?
Chondrichthyes characteristics They are mostly marine fishes. They contain a pair of jaws. Their jaws are very powerful.
What are the physical characteristics of a primate?
All primates use their hands, and frequently their feet, to grasp and manipulate objects. This ability is variably expressed and is enhanced by several characteristics, including: Retention of five digits on the hands and feet. This trait varies somewhat throughout the order, with some species having reduced thumbs or second digits (first fingers).
How are Chondrichthyes included in the Gnathostomata?
Chondrichthyes is a class of fishes included in the division Gnathostomata as they have jaws. The division Gnathostomata includes all the vertebrates having jaws. Gnathostomata is divided into two superclasses, viz. Pisces (having fins) and Tetrapoda (bear limbs). Pisces is divided into two classes:
How is the brain size of a primate determined?
CLASSIFICATION OF PRIMATE: Primates are divided into two sub-orders ie. This division is mainly based on the brain size of both the orders. Brains sizes of lower primates have similar size to other mammals while higher primates have large brain size relative to body size.