RF are taxonomically more closely related to lobe-finned fish and tetrapods (lobe-finned vertebrates) than CF (fig. 1A).
Mammals and turtles are more closely related than are lungfishes and sharks. Birds and ray-finned fishes have a notochord and jaws. Lancelets and coelacanths are more closely related than are chimaeras and coelacanths. Organism (c) is a common ancestor of lampreys and lungfishes.
Crown tetrapods are defined as the nearest common ancestor of all living tetrapods (amphibians, reptiles, birds, and mammals) along with all of the descendants of that ancestor.
The majority of palaeontological studies published during the last decade suggest that lungfish (Dipnoi) are the closest living relatives of the tetrapods or, alternatively, that coelacanths and lungfish form a monophyletic group that is equally closely related to the land vertebrates (11, 12).
Which fish is a diverse group of ray-finned fish?
Within this clade is theAtherinomorpha (guppies, killifishes and relatives), and the Percomorpha – by far the most diverse group of fish, containing over one-third of all ray-finned fish species, and exhibiting a fascinating array of body forms – including perches, seahorses, flatfishes, pufferfishes, and tunas.
What is the difference between Ray-finned fish and lobe-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.
Both coelacanths and lungfishes share the category sarcopterygian with the tetrapods, which includes land animals like reptiles, amphibians, birds, and mammals, e.g. humans. Evidence suggests that the tetrapods are related more closely to lungfish than to coelacanths.
Sharks, skates, rays and chimaeras are closely related, and belong to the class of vertebrates known as Chondrichthyes. They differ from other fish in that their skeletons are made of cartilage (the same flexible material in human noses and ears), not bones.
Coelacanths and lungfishes are two extant lineages of lobe-finned fish. RF are taxonomically more closely related to lobe-finned fish and tetrapods (lobe-finned vertebrates) than CF (fig. 1A).
Crocodiles are the closest living relatives of the birds, sharing a common ancestor that lived around 240 million years ago and also gave rise to the dinosaurs.
Are ray-finned fish tetrapods?
The word “tetrapod” means “four feet” and includes all species alive today that have four feet — but this group also includes many animals that don’t have four feet. … Most animals we call fishes today are ray-finned fishes, the group nearest the root of this evogram.
The coelacanth, the Indonesian coelacanth, and the lungfishes together make up a group known as the lobe-finned fishes. Their fins are attached to short limbs rather than directly to the body like in most species. These species are the closet fish relatives to the tetrapods (amphibians, reptiles, mammals, and birds).
Why are lobe-finned fish thought to be the closest relatives to tetrapods?
The fins are very flexible and potentially useful for supporting the body on land, as in lungfish and tetrapods (vertebrates with four limbs). Tetrapods are thoughto to have evolved from primitive lobe-finned fish. … It could also help the balance of the fish.
Are ray-finned fish Paraphyletic?
Actinopterygii (ray-finned fish) are monophyletic, but the inclusion of Sarcopterygii in Osteichthyes causes Osteichthyes to be paraphyletic. … They are traditionally treated as a class of vertebrates, with subclasses Actinopterygii and Sarcopterygii, but some newer schemes divide them into several separate classes.
What did the ray-finned fish evolve from?
Cartilaginous fishes, class Chondrichthyes, consisting of sharks, rays and chimaeras, appeared by about 395 million years ago, in the middle Devonian, evolving from acanthodians.
Do Ray-finned fishes 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).