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Chordata. I cordati ( Chordata Bateson, 1885) rappresentano un phylum di animali comprendente organismi di diversa forma e complessità, quali i Vertebrati, gli Urocordati ed i Cefalocordati. Questo phylum è basato su una struttura di sostegno interna o notocorda .
- Cephalochordata
I Cefalocordati (Cephalochordata) sono un piccolo subphylum...
- Cephalochordata
A chordate (/ ˈ k ɔːr d eɪ t / KOR-dayt) is a deuterostomic animal belonging to the phylum Chordata (/ k ɔːr ˈ d eɪ t ə / kor-DAY-tə). All chordates possess, at some point during their larval or adult stages, five distinctive physical characteristics (synapomorphies) that distinguish them from other taxa.
References. Other websites. Chordates, phylum Chordata, are a phylum of animals which have a notochord. The group includes vertebrates, with some closely related invertebrates . Classaxonomy. Phylum Chordata. Tunicata – (tunicates, formerly Urochordata; 3,000 species) † Vetulicolia (8 Cambrian species of fossil)
- Chordata, Bateson, 1885
29 mar 2024 · Chordate, any member of the phylum Chordata, which includes the vertebrates, the most highly evolved animals, as well as two other subphyla—the tunicates and cephalochordates. Some classifications also include the phylum Hemichordata with the chordates.
The Cambrian chordates are an extinct group of animals belonging to the phylum Chordata that lived during the Cambrian, between 538 and 485 million years ago. The first Cambrian chordate known is Pikaia gracilens, a lancelet -like animal from the Burgess Shale in British Columbia, Canada.
Characteristics of Chordata. Animals in the phylum Chordata share four key features that appear at some stage during their development: a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail (Figure 29.1.2 29.1. 2 ). In some groups, some of these are present only during embryonic development.
Structure. The notochord is a long, rod-like midline structure that develops dorsal to the gut tube and ventral to the neural tube. The notochord is composed primarily of a glycoproteins core that is encased in a sheath of collagen fibers. This is wound into two opposing helices.
