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12 kwi 2021 · PDF | On Apr 12, 2021, Veronica Slobodian and others published Vertebrates (Chordata) | Find, read and cite all the research you need on ResearchGate.
A Text Book of Chordates ... Classification of Chordata 2. 2.Protochordata 7-69. Definition 7 General Characters 7 Classification of Protochordata 7. 3.Agnatha 70-87. ... Chordate Phylogeny. 1. Origin of Chordates 63 2. Ostracoderm 83 3. Origin of Vertebrates 86 4. Placoderms 250 5. Holocephali 252
22 paź 2024 · chordate, any member of the phylum Chordata, which includes the vertebrates (subphylum Vertebrata), the most highly evolved animals, as well as two other subphyla—the tunicates (subphylum Tunicata) and cephalochordates (subphylum Cephalochordata).
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. In some …
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.
1 sty 2024 · At some time in their life cycle, all chordates have five major structures, some of which they share with the other deuterostome animals. These chordate-defining structures are: (i) a dorsal, hollow nerve cord, (ii) a notochord, (iii) pharyngeal slits or pouches, (iv) an endostyle or thyroid gland and (v) a tail behind the anus.
Aquatic chordates—such as tunicates, fishes, and amphibian larvae—use gills for respiration. Land vertebrates, including adult amphibians, reptiles, birds, and mammals, use lungs. Some chordates have respiratory structures in addition to gills and lungs. Bony fishes have accessory organs such as simple air sacs.
