Archaeaspinus was discovered in Zimnii Bereg, the Winter Coast of the White Sea in Russia, by A. Yu.

[1] Since then, numerous additional fossils have been attributed to the genus, mostly from that same type locality, but a small number from Flinders Ranges in South Australia as well.

It also contains what appears to be an unpaired lobe which branches off the isomer that is furthest forward to loop within the "head" section, following the shape of the body.

[3] The isomers are arranged in a gliding reflection symmetry, thought to have increased in size and quantity as the organism aged and grew.

[11] Newer analyses suggest that tissue on the ventral side of most Proarticulates, and therefore Archaeaspinus, bore cilia for feeding.