Which is a characteristic of the phylum Chordata quizlet?

All members of the phylum Chordata have what characteristics in common? A notochord(flexible supporting rod), a dorsal, hollow nerve cord, pharyngeal gill slits, and a post-anal tail.

What features are found in all members of the phylum Chordata?

The phylum chordata includes all animals that share four characteristics, although they might each possess some of them at different stages of their development: a notochord, a dorsal nerve cord, pharyngeal slits, and a postanal tail.

What are the characteristics of the Chordata phylum?

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 2). In some groups, some of these are present only during embryonic development.

Where did the chordates get their name from?

The chordates were originated from a fish-like ancestor, very similar to the larva of the Ascidia (Tunicata) and it is assumed that they became the ancestor of the chordates by retaining the larval form throughout the life. In the palaeozoic age, the chordates were originated from some sessile Echinoderms, which were bottom dwellers of the sea.

Are there any vertebrates that are not chordates?

This is why it is said that ‘all vertebrates are chordates but all chordates are not vertebrates’. A high degree of cephalization is observed. The epidermis is multi-layered. They consist of three types of muscles-striped, unstriped and cardiac.

Why is the notochord replaced in the adult Chordata?

It is also known as Tunicata because the body of an adult is enclosed within a tunic made up of cellulose -like substance known as tunicin. Notochord can be seen only in the larval stage and disappears in the adults. The nerve cord present in larva is replaced by a dorsal ganglion in adults.