The Pteraspis was an Early Devonian fish and it’s quite representative among heterostracans (primitive armoured fishes with no lateral fins as we know them and with no internal bone) as it defines the group of pteraspids. These had a more dynamic body plan, other early fishes, (like Sacabambaspis) are less fish-like. Pteraspids have already a forked tail that must have made them quite hydrodynamic, while the large chunks of armour protected them from the attack of predators (there were limits though, one must have in mind that there were really big threats back then, I have in mind the Sibbick image where a Pterygotus is chasing a group of Pteraspis). Undoubtedly this guys was a peaceful algae and plankton grazer, the mouth was barely large enough for the fish to filter properly. It’s been speculated that it lived near the surface in the midst of clouds of food. But all good things have to end, after the first big radiation, agnathans stopped being succesful and were rapidly outmanoeuvered by other fishes.
As a huge fan of prehistoric fishes, I truly treasure this unusual figure. There are not many heterostracan figures out there (the Starlux Drepanaspis comes to mind). It took me a while to find it, so if you see it, catch it, it’s obviously an uncommon choice and it’s marvelously detailed. The most representative things about Pteraspis: one, the large spiny projection growing on the back, and two, the large rostrum with also a long projection. Both are present on this representation, although perhaps both are larger than a conservative estimate would suggest. The rostrum is a little pointier than it should be. The main colour is brown orange, which is the color of the resin it’s made out of. The bone plaques are covered with a pearl-like iridescence and have a pattern of spots and stripes. The spine and the rostrum become clearer (the base is semiopaque). The posterior part of the body, covered in beautifully detailed scales, is delineated by a black stripe and is decorated by tiny black and yellowish spots. The entry of the mouth is represented by a pinkish zone where the rostrum spine begins. Kaiyodo did an amazing job and there are more details if one looks closely. The shape of the tail (the lower lobe being more prominent than the upper one), the smaller spines, the bony protuberances of the dorsal shield and the tiny (albeit unpainted, which makes them almost invisible) eyes are there but what astonishes me is that on both shields we can see the rings that represent the growth stages of the animal (these markings are very typical on pteraspid fossils).
As always, the details put to shame many larger series (sadly, that includes other Kaiyodo lines, such as Dinoland). It’s very small (roughly 8 cm) but I can’t think of a better figure.


















