410 million years ago
Mean atmospheric O2
75% of modern level
Mean atmospheric CO2
8x pre-industrial level
6°C above modern level
Geologic Time Scale
Doryaspis & Actiniaria
jawless fish of the genus Doryaspis swim amongst a bed of Anthozoa
of the order Actiniaria (AKA sea anemones) 410 million years ago in what is today the Svalbard
archipelago in Norway. Doryaspis (AKA Lyktaspis)
was armored with bony spines and a long snout that had spines set along its length
(somewhat like the "saw" of a modern sawfish). Doryaspis' mouth
opened above, rather than below, the snout and is believed to have dined on
plankton, however the snout may have been used to stir up small crustaceans
from the mud or sand.
to a variety of anemones are palm-like crinoids (class Crinoidea),
pentagonal-shaped sea stars, nautilus-like ammonites, and squid-like nautiloid
cephalopods of the genus Orthoceras.
© Walter B. Myers. All rights reserved.
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