Question

Many non chordates have an anus at the end of their tails. The lancelet and the larval stage of the sea squirt have an anus located more anteriorly, with muscle blocks along the tail. How does this development allow for a different type of movement in invertebrate chordates.

Answer 1

Different type of movement is swimming

Step-by-step explanation:

Invertebrate chordates are animals of the phylum Chordata that possess a notochord at some point in their development, but no verbal column(backbone).

A notochord is a cartilage-like rod that serves a supportive function by providing a site of attachment for muscles.

Invertebrate Chordates belong to the subphylum of cephalochordata and Urochordata.

Invertebrate chordates in the phylum Tunicata also known as Urochordata, dwell in marine environments. They possess specialized external coverings for food filtration and are suspension feeders.

Since the resulting larvae share all of the common invertebrate chordate characteristics including a notochord, dorsal nerve cord, pharyngeals slits, endostyle, and a post-anail tail. They are similar to tadpoles in appearance, and unlike adults, the larvae are mobile and swim around until they find a firm surface on which to attach and grow.