I don no
it is called a notochord.
Atrium
The segments of DNA that code for a functional product (protein) are called genes.
The flexible, supporting structure found only in chordates is called the notochord. The notochord is located between the nerve cord and the digestive track.
These body parts are called segments.
Vertebrata.
Chordates such as the sea squirts and lancelets do not have a backbone that is why they are called vertebrate chordates.
All fish are chordates. Chordates are vertebrates that have a hollow dorsal nerve called a notochord. They also have a central nervous system and gill clefts.
Well, no they don't... There's a group of chordates called Agnatha which basically contains all the jawless chordates. And there are obviously limbless chordates present, the fishes and the snakes being the most well-known of the examples...
chordates
invertebrates or non-chordates
granum
it is called a notochord.
The line segments that form a polygon called are called sides or edges.
Cephalochordates e.g. Amphioxus ,; tunicates , acorn worms etc. are nonvertebrate chordates , they are collctively called protochordates .
Atrium
notochord