Do Lobe Finned Fish Have Jaws?

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What are the characteristics of lobe-finned fish?

One of the most important characteristics of lobe-finned fish is the lobe in their fins. Unlike other fish, sarcopterygian fish has a cental appendage in their fins containing many bones and muscles. The fins are very flexible and potentially useful for supporting the body on land, as in lungfish and tetrapods.

Do ray-finned fish have jawed vertebrates?

The jawed vertebrates (gnathostomes) fall into two major taxa, the Chondrichthyes (cartilaginous fishes) and Osteichthyes (bony fishes). The latter taxon includes sarcopterygians (coelacanths, lungfishes, and tetrapods) and actinopterygians (ray-finned fishes).

How do you identify lobe-finned fish?

annotated classification. Subclass Sarcopterygii (lobe-finned fishes) Usually possess a choana; paired fins with a fleshy base over a bony skeleton; persisting notochord; 2 dorsal fins; nares are internal.

What type of fish is a lobe-finned fish?

The Sarcopterygii, or lobe-finned fishes, is a clade containing the coelacanths, lungfishes, tetrapods, and their fossil relatives, including the osteolepiformes and panderichthyids. They are the sister group to the ray-finned fishes (Actinopterygii), together forming the bony fishes (Osteichthyes).

What is the difference between lobe and ray-finned fish?

Most bony fish are ray-finned. These thin fins consist of webs of skin over flexible spines. Lobe-finned fish, on the other hand, have fins that resemble stump-like appendages.

Do cartilaginous fish have jaws?

Cartilaginous fishes have a skeleton made of cartilage, a material that is lighter and more flexible than bone. These type of fishes have movable jaws that are usually armed with well developed teeth. The mouth is often located underneath the head.

How do jawless fishes and jawed fishes differ?

The defining features of the living jawless fishes are the lack of jaws and lack of paired lateral appendages (fins). They also lack internal ossification and scales, although these are not defining features of the clade.

Do lampreys have jaws?

Lampreys do not have jaws, however, but have a sucking disk for a mouth. They have seven pore-like gill openings on each side of the head and a single nostril is located in the middle of the head just below the eyes. Lampreys also have a skeleton made completely of cartilage.

How do lobe-finned fish swim?

As the name suggests, the fins are supported by parallel bony rays, which in life are webbed with thin tissue; the fins themselves contain very little muscle, and are primarily moved by muscles within the body. The skull is a complex assemblage of bones.

Are sharks lobe-finned?

The vertebrates that possess all four propeptides span the groups of Actinopterygians (ray-finned fishes) and Sarcopterygians (flesh- or lobe-finned fishes) (Fig. 3). Among Chondrichthyes (sharks, rays, and chimaeras), it has so far been possible to identify proenkephalin, prodynorphin and POMC.

Do lobe-finned fish have bones in their fins?

Unlike other fish, Lobe-finned fish have a central appendage in their fins containing many bones and muscles. The fins are very flexible and potentially useful for supporting the body on land, as in lungfish and tetrapods (vertebrates with four limbs).

Are humans lobe-finned fish?

Humans, like all mammals, reptiles, amphibians and birds, are tetrapods: four-legged vertebrate animals that all descended from an ancestral fish. This ancestor would have been a lobe-finned fish – somewhat different from the ray-finned fishes, from salmon to sardines, that fill the oceans today.

Do lobe-finned fish have legs?

Classification. Taxonomists who subscribe to the cladistic approach include the grouping Tetrapoda within this group, which in turn consists of all species of four-limbed vertebrates. The fin-limbs of lobe-finned fishes such as the coelacanths show a strong similarity to the expected ancestral form of tetrapod limbs.

When did lobe-finned fish become extinct?

For many years they were considered the only extant lobe-finned fishes until 1938, when a surviving member of the coelacanths, Latimeria chalumnae, was caught off the Comoro archipelago near the eastern coast of Africa in the Indian Ocean. A second species, Latimeria menadoensis, was discovered in 1999 in Indonesia.

What do lobe-finned fish eat?

Lungfish will eat snails, clams, prawns, worms, water flies, and water plants. They sense the presence of their food by using mechanical sensors in the skin of the head and body.


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