Chordate evolution and the three-phylum system
2014年11月7日 · 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 how we should reclassify the major chordate groups.
Evolution and Phylogeny of Chordates | SpringerLink
2024年1月1日 · Living chordates consist of three subgroups: (i) the vertebrates (informally, the fishes, amphibians, reptiles and mammals), (ii) cephalochordates (also known as amphioxus or lancelets) and (iii) tunicates (or urochordates, including “sea squirts”). Representatives of these three subgroups are shown in Figs. 1 and 2.
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 …
Evolution of the chordate body plan: New insights from phylogenetic …
2000年4月25日 · Recent molecular phylogenies suggest that deuterostomes include only echinoderms, hemichordates, and chordates (1–4), because chaetognaths and lophophorates (6–8) are likely to be protostomes. The chordates are composed of three subphyla, Vertebrata, Cephalochordata, and Urochordata.
Editorial: New Approaches in Chordate and Vertebrate Evolution …
Cephalochordates, or amphioxus, share with tunicates and vertebrates the oldest common ancestor of chordates. This key phylogenetic position in the chordate tree , together with its slow evolving nature, both at the morphological and genomic levels, turn amphioxus into a unique and crucial animal for understanding the origin of chordate traits ...
Chordate phylogeny and evolution: a not so simple three‐taxon …
2008年10月7日 · Traditional concepts of chordate phylogeny have recently been in turmoil: in a large-scale molecular study, the traditional hypothesis that cephalochordates are sister taxon to craniates was replaced by the hypothesis of a sister group relationship between tunicates and …
The deuterostome context of chordate origins | Nature
2015年4月22日 · Modern phylogenetic analysis has confirmed the union of these three phyla in a single clade. This group, the deuterostomes, provides the phylogenetic framework for developing hypotheses about...
Tunicates and not cephalochordates are the closest living ... - Nature
2006年2月23日 · Here we show that phylogenetic analyses of this data set provide compelling evidence that tunicates, and not cephalochordates, represent the closest living relatives of vertebrates.
The amphioxus genome illuminates vertebrate origins and cephalochordate …
2007年10月26日 · Our results indicate that the amphioxus genome is elemental to an understanding of the biology and evolution of nonchordate deuterostomes, invertebrate chordates, and vertebrates. The phylum Chordata comprises cephalochordates (amphioxus or lancelets), urochordates (tunicates), and vertebrates.
The evolutionary origin of chordate segmentation: revisiting the ...
2018年2月27日 · The phylum Chordata (cephalochordates, tunicates, vertebrates) is defined by the somites, which are a series of segmental blocks that arise in the paraxial mesoderm during early embryogenesis (Fig. 1a) (Holland et al. 2015; Onai et al. 2015b); in amphioxus, somites span from anterior to posterior, and in vertebrates, somites develop posterior ...