Question

How do invertebrate chordates move?

Answer 1

Hint: Coelomates, or species with a real body cavity, are invertebrate chords. This fluid-filled cavity (coelom) found between the body wall and the digestive tract is what separates coelomates from acoelomates.

Complete answer:
The following are characteristic features of invertebrate chordates:
The chordates have a notochord in them. The notochord stretches to its tail, towards its dorsal (back) surface and dorsal to the digestive tract from the head of the animal. As the animal runs, it provides a semi-flexible frame for muscles to be used for support.
There's a dorsal nerve tube for all chordates. The dorsal portion of this hollow tube or nerve cord is the notochord. In vertebrate chordates, the dorsal nervous tube grows into the brain and spinal cord systems of the central nervous system. It is commonly seen in invertebrate chordates in the larval stage of development, but not in the adult stage.
Both chordates have a tail which is post-anal. This extension of the body goes past the end of the digestive tract and is seen in certain chordates only in the early developmental stages.
There are pharyngeal gill slits for all chordates. These structures are essential for both feeding and breathing in invertebrate chordates. In the early embryonic stages of development, land vertebrates have gill structures that develop into other structures (e.g., voice box) as the embryo matures.
Invertebrate chordates consist primarily of 2 sub-phyla’s—
1) Urochordata
2)The Cephalochordata
Take an example of one of the most studied animals, called Herdmania, in the case of Urochordata.
It is a sessile organism as its foot is stuck in sand, i.e., it lives attached to a substratum (sand here), so it does not move.
The example considered for Cephalochordata is Branchiostoma, also referred to as Amphioxus. This is a marine type of species and its movement is either determined by water current or water flow.

Note:
Invertebrate chordates usually reproduce by sexual means. Some are also capable of asexual reproduction. There are four main characteristics common to chords in all three subphylums. These characteristics are observed at some stage during the growth of organisms.