What is Ray fin?

What is Ray fin?

Ray-fins and lobe-fins (Sarcopterygii) are the two known lineages of bony fishes (Osteichthyes). They share a number of important features including the possession of a swim bladder (or lung) and paired pectoral (shoulder) and pelvic fins. One important difference between these groups is found in these paired fins.

What is the most advanced fish?

teleost
teleost, (infraclass Teleostei), any member of a large and extremely diverse group of ray-finned fishes. Along with the chondrosteans and the holosteans, they are one of the three major subdivisions of the class Actinopterygii, the most advanced of the bony fishes.

What are some examples of ray-finned fish?

AnglerfishParrotfishKoiPuffersCatfishMahi‑mahi
Ray-finned fishes/Lower classifications

What are Ray fins made of?

Features: The skeleton of the paired fins is formed from many small bones, called fin rays, in a fan-like arrangement, which are supported at the bases of the fins by parallel rows of bones called radials.

Are there any fish with lungs?

A rare species Throughout the world, there are only 6 species of lungfish—one in South America, one in Australia and four in Africa. The Australian (or Queensland) lungfish is the most primitive out of the bunch with only a single lung, compared to the paired lungs the others have.

What is meant by ray-finned fish?

ray-finned fish. Any of various bony fishes belonging to the subclass Actinopterygii, having fins supported by thin bony rays. Ray-finned fish evolved in the early Devonian Period and include most species of fish today.

What are the 4 main characteristics of a ray-finned fish?

The anatomy of ray-finned fish shows many of the characteristics common to all chordates: pharyngeal slits, a nerve cord, and body wall muscles arranged in myotomes, or segmented blocks. Ray-finned fish also have several unique anatomical features that suggest adaptation for an aquatic lifestyle.

Do teleost fish have teeth?

In more derived teleosts, the enlarged premaxilla is the main tooth-bearing bone, and the maxilla, which is attached to the lower jaw, acts as a lever, pushing and pulling the premaxilla as the mouth is opened and closed….Teleost.

Is catfish a teleost?

Catfish (order Siluriformes) is one of the largest orders of teleosts containing ∼4100 species, representing ∼12% of all teleosts and ∼6.3% of all vertebrates (Eschmeyer and Fong, 2014; Wilson and Reeder, 2005).

What is fin formula?

Fin count formula is given as below: D1, I, VII-VIII – This denotes first dorsal fin with one spine separated from the. rest of spines (VII-VIII). D2, I, 15-16 – This denotes second dorsal fin with one spine followed by. 15-16 rays.

What is special about ray-finned fish?

The fins are supported by rays, as the name indicates. In contrast to the cartilaginous fish they have a rigid skeleton. The swim bladder is also a unique feature of most ray-finned fish, enabling them to maintain buoyancy as they move up or down in the water.

How many Actinopterygii are there?

The ray-finned fishes (actinopterygians) are the largest group of living fishes and compose half of the living vertebrates. There are around 42 orders, 431 families and nearly 24,000 species. Almost all fish that you see belong to this class of fish.

Does Actinopterygii have jaws?

It is, and there are about 50 species of seahorses. Although they are bony fish, they do not have scales; instead, they have a thin skin stretched over a series of bony plates arranged in rings throughout their body….Classification of Fishes.