History of the Universe

History of the Universe eBook. 398 pages, 300 illustrations only £5.99

Font Smaller Font Bigger

Protostomes

The group of animals to which the molluscs, arthropods and annelid worms belong is called the Protostomes.

Protostomia means "first mouth", so called because the mouth develops from the first opening into the gut (blastopore). The body cavity or coelom forms from a split in the embryonic middle tissue (mesoderm). The larvae of Protostomia are called trochophores.

Contrast this with the other major group of animals, the Deuterostomes.

Get this website as an eBook only £5.99


Start Earlier Later Index Contents Timeline News Store Privacy & Cookies Non Mobile Site Font Smaller Font Bigger
By the same author
The Cosmic Monopole
FREE EBOOK! Stunning romance sci-fi adventure

Written by Wyken Seagrave
Copyright © 2025 Penny Press Ltd