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astronomy-to-zoology:

Pteraspis stensioei

…is an extinct species of jawless fish that lived during the early Devonian period. Like its heterostracan relatives pteraspis was covered in armor plating and protective spines. In-order to swim with all that heavy armor they had a large hypocercal tail to allow them to move in the water, its rostum and streamlined shape made it a pretty good swimmer. It is thought to have fed on plankton and other small invertebrates with sucking mouth parts.

Phylogeny

Animalia-Chordata-Aganatha-Pteraspidomorphi-Heterostraci-Pteraspidiformes-Pteraspidae-Pteraspis-stensioei

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