Arthropoda (insects, chelicerata, crustaceans, and myriapods), Nematoda, and a few other minor phyla are all included in the group of protostome creatures known as Ecdysozoa (/kdsozo/).
Aguinaldo etal. provided the initial definition of them in 1997, largely based on phylogenetic trees generated with the use of 18S ribosomal RNA genes.
The Ecdysozoa were firmly supported as a clade in a sizable study conducted in 2008 by Dunn etal.
A clade is a group made up of all the descendants of a common ancestor.
All animals that grow by ecdysis, or moulting their cuticle, are included in this group, which is also supported by morphological characteristics.

<h3>What is phyla?</h3>

A phylum is a taxonomic rank or degree of classification in biology that comes before a kingdom and after a class (/falm/; plural: phyla).
Phylum and division are similar terms according to the International Code of Nomenclature for algae, fungus, and plants, but division has historically been used in botany instead of phylum.
Depending on definitions, there are between 31 and 14 phyla in the plant kingdom Plantae, 8 phyla in the fungus kingdom Fungi, and roughly 31 phyla in the animal kingdom Animalia.
The links between phyla, which are housed in more expansive clades like Ecdysozoa and Embryophyta, are currently being revealed via phylogenetic studies.

Learn more about phyla and Ecdysozoa here:

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