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11 thg 7, 2023 · Chordates encompass a diverse and fascinating group of animals, characterized by a set of unique anatomical features that define their evolutionary lineage. From the mighty blue whale to the unassuming lancelet, chordates span a wide range of species, inhabiting diverse ecosystems across the globe.
The chordates are named for the notochord, which is a flexible, rod-shaped mesodermal structure that is found in the embryonic stage of all chordates and in the adult stage of some chordate species. It is strengthened with glycoproteins similar to …
The current consensus is that chordates are monophyletic (meaning that the Chordata includes all and only the descendants of a single common ancestor, which is itself a chordate) and that the vertebrates ' nearest relatives are tunicates.
Underlying this breathtaking array of life forms is a shared evolutionary heritage: the chordate body plan. This post delves into the crucial aspects of Section 33.3 (a common section title in comparative anatomy textbooks), exploring the form and function of key chordate characteristics.
2 thg 8, 2025 · The body is supported by fluid in the body cavities, and the locomotory muscles are organized segmentally. All chordates form at least the suggestion of a brain, but it is well developed only in vertebrates. The circulatory system in chordates has a characteristic pattern.
2 thg 10, 2024 · In chordates, this tail is composed primarily of skeletal muscle and aids in locomotion, particularly in fish-like species. While present in the embryonic stages of many chordates, it is often reduced or absent in most adult forms, such as in humans.
It is located between the digestive tube and the nerve cord, providing skeletal support through the length of the body. In some chordates, the notochord acts as the primary axial support of the body throughout the animal’s lifetime.
In chordates, the nervous system forms as a dorsal hollow tube as opposed to a solid ventral tube typical of other coelomates. In vertebrates this forms the central nervous system's brain and spinal cord.
It is located between the digestive tube and the nerve cord, and provides skeletal support through the length of the body. In some chordates, the notochord acts as the primary axial support of the body throughout the animal’s lifetime.
31 thg 7, 2024 · What are chordates. Learn about the phylum Chordata with examples and their features, including symmetry, habitat, reproduction, evolution, and fossil records.
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