Evolution and Phylogeny of Vertebrates | SpringerLink
2024年1月1日 · Vertebrates (backboned animals) are part of the wider group Chordata (see Phylogeny and Evolution of Chordates), characterized by the possession of an axial stiffening rod (notochord), a perforated pharynx, a dorsal hollow nerve cord, and a post-anal tail.
Vertebrate - Wikipedia
The vertebrates make up the subphylum Vertebrata with some 65,000 species, by far the largest grouping in the phylum Chordata. The vertebrates include mammals, birds, amphibians, and various classes of fish and reptiles. The fish include the jawless Agnatha, and the jawed Gnathostomata.
The Evolutionary Emergence of Vertebrates From Among Their …
2009年5月5日 · The origin of vertebrates and of jawed vertebrates is characterized by a doubling of the vertebrate genome, leading to hypotheses that this genomic event drove organismal macroevolution. However, this perspective of evolutionary history, based on living organisms alone, is an artifact.
Phylogenetic taxonomy of the Vertebrates - Memorial University
The phylogenetic system accurately reflects the evolutionary history of Vertebrates, but requires recognition of unfamiliar characters, notably the number and position of openings in the skull.
12.7: Vertebrate Evolution - Biology LibreTexts
Vertebrate Evolution. The earliest vertebrates were jawless fish, similar to living hagfish. They lived between 500 and 600 million years ago. They had a cranium but no vertebral column. The phylogenetic tree in Figure below gives an overview of vertebrate evolution. As more data become available, new ideas about vertebrate evolution emerge.
Chordate evolution and the three-phylum system - PMC
Chordates consist of three distinct animal groups: cephalochordates, urochordates (tunicates) and vertebrates. This review starts with a brief description of how the Phylum Chordata and its three subphyla were originally defined, and then discusses …
Origin of Vertebrates - Evolutionary Biology - Oxford Bibliographies
2024年7月24日 · Presents two relevant conceptual aspects: the systematic renewal of the vertebrate phylum and the application of the concept of degeneration to explain the evolution of the species associated with the invertebrate–vertebrate connection.
Evolution and Phylogeny of Vertebrates - ResearchGate
2009年1月1日 · The origin of tetrapods is a major outstanding issue in vertebrate phylogeny. Each of the three possible principal hypotheses (coelacanth, lungfish, or neither being the sister group of...
An Overview of Vertebrate Phylogeny | SpringerLink
The first question in vertebrate biology is the basic one: who are the vertebrates and where did they come from. So we begin this book with a survey of vertebrate phylogeny, a complex history constructed by generations of naturalists, systematic biologists and...
Vertebrate - Evolution, Paleontology, Anatomy | Britannica
Vertebrate - Evolution, Paleontology, Anatomy: The ancestral vertebrate (protovertebrate) has been sought for more than 100 years, but since the protovertebrate was probably small and soft-bodied it is unlikely a fossilized form will be found in a recognizable condition.