Blastozoa

Blastozoa is a subphylum of extinct echinoderms characterized by the presence of specialized respiratory structures and brachiole plates used for feeding.^[1] It ranged from the Cambrian to the Permian. Biserial, triradiate, and pentaradiate ambulacral patterns have been identified in blastozoa specimens. The pentaradiate pattern in particular has been associated with several different classes.^[2]

Blastozoa Temporal range: Cambrian–Permian PreꞒ Ꞓ O S D C P T J K Pg N
Blastoids, an example of a single group of blastozoans.
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Subphylum:	†Blastozoa
Classes
Class Eocrinoidea (Cambrian - Silurian) Class Parablastoidea (Ordovician) Class Rhombifera (Ordovician - Devonian) Class Diploporita (Ordovician - Devonian) Class Blastoidea (Ordovician - Permian) Class Paracrinoidea (Ordovician-Silurian)

A significant species has been found at the Zaouïa Formation.^[3]