Cheetahs are classified as members of the phylum Chordata because they possess certain key characteristics that define this group. The phylum Chordata includes all animals that have, at some stage of their life cycle, a notochord, a dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail.
Specifically, cheetahs, like all mammals, exhibit these features:
- Notochord: During their embryonic development, cheetahs have a notochord, which provides structural support. In most vertebrates, including cheetahs, this notochord is replaced by a backbone, or vertebral column, as they mature.
- Dorsal Hollow Nerve Cord: Cheetahs possess a dorsal hollow nerve cord, which is part of their central nervous system. This structure runs along the back and is crucial for nerve signal transmission.
- Pharyngeal Slits: Although cheetahs do not retain pharyngeal slits in adulthood like some other chordates, these structures can be found during their embryonic development, a trait shared with other members of the phylum.
- Post-Anal Tail: Cheetahs also have a post-anal tail, which aids in balance and agility when they are running at high speeds, typical of their hunting behavior.
In summary, the defining characteristics of the phylum Chordata are evident in cheetahs, making them a clear member of this diverse group of animals.