Originally briefly described as eurypterids , they were formally described as Octoberaspis ushakovi by Jason Dunlop .
Well preserved chasmataspids were recovered from the early Devonian of October Revolution Island , part of the Severnaya Zemlya group in the Russian Arctic .
Originally briefly described as eurypterids , chasmataspids were formally described as Octoberaspis ushakovi by Jason Dunlop .
Well preserved chasmataspids were recovered from the early Devonian of October Revolution Island , part of the Severnaya Zemlya group in the Russian Arctic .