What Does It Mean Postanal Tail?
A Post-Anal Tail Is an Extension of the Body That Runs Past the Anal Opening. in Some Species, Like Humans, This Feature Is Only Present During the Embryonic...
A post-anal tail is an extension of the body that runs past the anal opening. In some species, like humans, this feature is only present during the embryonic stage. The chordata phylum is divided into three groups or subphylums: lancelets, tunicats, and vertebrates.
What is the function of the Postanal tail?
The post-anal tail is a posterior elongation of the body, extending beyond the anus. The tail contains skeletal elements and muscles, which provide a source of locomotion in aquatic species. In some terrestrial vertebrates, the tail also helps with balance, courting, and signaling when danger is near.
What does the word chordate mean?
: any of a phylum (Chordata) of animals having at least at some stage of development a notochord, dorsally situated central nervous system, and gill slits and including the vertebrates, lancelets, and tunicates.
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