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A chordate (/ ˈ k ɔːr d eɪ t / KOR-dayt) is a deuterostomal bilaterian 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.
The cells identified in Zone 2 contain an acid mucous material. When using Hale's dialysed iron method, Zone 2 of the endostyle is the darkest definitive region. Zone 2 contains streaky and prominent pyroninephilia from the apical pole to the nuclei on the cell surface. [4] Zone 3 is classified by narrow ciliated bands nestled between glandular ...
The pancreas of the shark helps with digestion by producing the enzymes needed to break down large chunks of food, and the pancreas serves to help keep the metabolism at a fast pace to accommodate for the large amounts of food taken in. [18] At the very end of the short intestine lies the rectal gland which is important for the excretion waste ...
[citation needed] Acorn worms have gill-like structures that they use for breathing, similar to the gills of primitive fish. Therefore, acorn worms are sometimes said to be a link between classical invertebrates and vertebrates. Some also have a postanal tail which may be homologous to the post-anal tail of vertebrates.
Idealised vertebrate body plan, showing key characteristics. Vertebrates (and other chordates) belong to the Bilateria, a group of animals with mirror symmetrical bodies. [6] They move, typically by swimming, using muscles along the back, supported by a strong but flexible skeletal structure, the spine or vertebral column.
Studies based on direct observations, fecal and gut analyses, as well as food-choice experiments, have revealed that snails and slugs consume a wide variety of food resources. [26] Their diet spans from living plants at various developmental stages such as pollen , seeds, seedlings , and wood, to decaying plant material like leaf litter.
This, combined with an apparent lack of vertebral elements within the Myxini, suggested that the Myxini were descended from a more ancient lineage than the vertebrates, and that the skull developed before the vertebral column. The clade was thus composed of the Myxini and the vertebrates, and any extinct chordates with skulls.
There are other differences in respiratory and circulatory structures. Ray-finned fish normally have skeletons made from true bone, though this is not true of sturgeons and paddlefish. [42] Ray-finned fish are a dominant vertebrate group, containing half of all known vertebrate species.
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