What is the definition in phylogenetic terms of a Tetrapodomorph fish?

What is the definition in phylogenetic terms of a Tetrapodomorph fish?

Tetrapodomorpha is a clade of vertebrates, consisting of sarcopterygians with a number of features of tetrapods. Among the characters defining the tetrapodomorphs are modifications to the fins, notably a humerus with convex head articulating with the glenoid fossa (the socket of the shoulder joint).

Are tetrapods sarcopterygians?

The group Tetrapoda, a superclass including amphibians, reptiles (including dinosaurs and therefore birds), and mammals, evolved from certain sarcopterygians; under a cladistic view, tetrapods are themselves considered a group within Sarcopterygii.

Are mammals Sarcopterygii?

The Class Sarcopterygii, the lobe-finned fishes, contains only a few living representatives – the coelacanth and six species of lungfish. Since mammals are not included in the class Sarcopterygii, this class is considered a paraphyletic group.

Are humans tetrapods?

The term tetrapod refers to four-limbed vertebrates, including humans. To complete this transition, several anatomical changes were necessary. Elpistostege, from the Late Devonian period of Canada, is now considered the closest fish to tetrapods (4-limbed land animals), which includes humans.

What did ichthyostega evolve into?

Amphibians evolved during the middle of the Devonian period (416 to 359 million years ago) from the lobe-finned fish of the vertebrate class Sarcopterygii. Species within the genus Ichthyostega (members of the Labyrinthodontia subclass) are considered by some scientists to be the earliest amphibians.

What came before tetrapods?

Tetrapods evolved from a group of animals known as the Tetrapodomorpha which, in turn, evolved from ancient sarcopterygian fish around 390 million years ago in the middle Devonian period; their forms were transitional between lobe-finned fishes and the four-limbed tetrapods.

Are birds Sarcopterygii?

Sarcopterygii are the lobe-finned fishes and, on the basis of their shared evolutionary ancestry (cladistics), comprise lungfishes, coelacanths, and the tetrapods (amphibians, reptiles, birds, and mammals).

How many species of Sarcopterygians are living today?

The lobe-finned fishes (Sarcopterygii) are currently represented by six species of lungfishes (Dipnoi) and two species of coelacanths (Actinistia).

Are frogs Sarcopterygii?

The lobe-fin fish clade (Sarcopterygii) includes a tetrapod subgroup (Tetrapoda), which likewise has subgroups Lissamphibia (frogs, salamanders, etc.) and Amniota (reptiles including birds plus mammals).

Are all vertebrates tetrapods?

The first tetrapods were primarily aquatic. Modern amphibians, which evolved from earlier groups, are generally semiaquatic; the first stage of their lives is as fish-like tadpoles, and later stages are partly terrestrial and partly aquatic….Tetrapod.

Which of the following are tetrapods?

Today, the term tetrapod includes all those animals that have legs, as well as those whose ancestors had them but which have since abandoned or modified them, such as whales and bats (these are mammals like ourselves), snakes (whose immediate relatives are lizards), birds (which are descended from dinosaurs), and frogs …

How did Ichthyostega breath?

Though Crossopterygians possessed lungs, they used gills as their primary means of acquiring oxygen; Ichthyostega appears to have relied on its lungs as its primary apparatus for breathing.