What are the 2 subclasses of Osteichthyes?

What are the 2 subclasses of Osteichthyes?

The two subclasses of Osteichthyes are Sarcopterygii, or lobe-finned fishes, and Actinopterygii, or ray-finned fishes. The Sarcopterygii are the least numerous of the Osteichthyes, featuring only two types: lungfish and coelacanth.

What are the 3 types of paired fins that class Osteichthyes and class Osteichthyes have?

Bony fish also have a swim bladder. The swim bladder is a gas-filled sac that helps keep bony fish buoyant! They have paired pectoral and pelvic fins, and all but a few species have bones in their fins. They also have dorsal, anal, and caudal fins.

Which groups are included within the Osteichthyes?

Osteichthyes, or bony fishes, includes two major groups: Sarcopterygii, or lobe-finned fishes, and Actinopterygii, or ray-finned fishes.

What type of fish has a Homocercal tail?

Teleosts (ray finned fishes) and lungfishes have a place with class Osteichthyes. They have a homocercal tail however lungfishes are lobed fin fishes. Sharks and beams have a place with class Chondrichthyes and have a heterocercal tail.

What four characteristics can you list for the class 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.

What is the oldest fish class?

Agnatha
The first fish lineages belong to the Agnatha, or jawless fish. Early examples include Haikouichthys. During the late Cambrian, eel-like jawless fish called the conodonts, and small mostly armoured fish known as ostracoderms, first appeared.

What are the three subclasses of the osteichthye?

Living Osteichthyes are divided into three subclasses: Dipnoi, Crossopterygii, and Actinopterygii. The subclass Dipnoi (lungfishes) is characterized by an upper jaw fused to the braincase, fused teeth, and the presence of an air-breathing organ that opens to the esophagus.

What are the two classes of bony fish?

Now the classes of bony fish are divided into 2 classes. One is Sarcopterygii and the other is Actinopterygii. Fish of the class Sarcopterygii are known as Lobe Finned Fish. Crossopterygian and lung fish originated from this group of fish of primitive nature.

What is the name of the third class of fish?

In fact, the word ‘chondrichthyes’ means ‘cartilaginous fishes.’ There are numerous kinds of cartilaginous fishes alive in oceans today, including over 600 species of sharks, rays, and chimaera. The third class of fish is called the osteichthyes, which means ‘bony fishes.’ Unlike the agnathans, bony fishes have jaws.

Which is an example of a sarcopterygii class?

Currently the fish called Latimaria survives as an example of the surviving Sarcopterygii class. Actinopterygii have led to the emergence of true bony fish. Although Sarcopterygii and Actinopterygii are described as two classes, most scientists now refer to Osteicethyes as a class while Sarcopterygii and Actinopterygii as subclasses.