Mar 13, 2025
Eurhinosaurus, Phosphorosaurus, Dakosaurus, Gebrayelichthys, Mixosaurus, Palaeoctopus, Coccosteus, Nectocaris, and Tachynectes!
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Eurhinosaurus, Phosphorosaurus, Dakosaurus, Gebrayelichthys, Mixosaurus, Palaeoctopus, Coccosteus, Nectocaris, and Tachynectes!
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Coccosteus, Animal Armor traveling exhibit at the Putnam Museum in Davenport, IA.
"Corals, fishes, and crustaceans of the Devonian: In the foreground are Corals of the genera Favosites, Michelina, Phillipsatrea, Zaphrentis, Blothrophyllum, and Syringopora, and the seaweed Spirephyton; also Fishes of the genera Cephalaspis and Pterichthys. Above are Pterygotus and Dinichtys, with Fishes of the genera Diplacanthus, Osteolepis, Holoptychius, Pteraspis, Coccosteus, etc. The distant land had Lepidodendra, Pines and Tree-ferns."
From The Story of the Earth and Man by J. W. Dawson, 1873
https://www.gutenberg.org/files/42741/42741-h/42741-h.htm
DUNKLEOSTEUS ^ juvenile fossil (photo 1), an adult (photo 3) & a reconstruction (photo 2) - a late devonian fish that lived 382β358 million yrs ago and was one of the first vertebrate apex predators. because its body has not been preserved, it was once estimated to have reached sizes such as 8.79 or even 10 meters long, but after a publication in 2023 using a much more reliable scaling method, it turned out that dunkleosteus must've actually been around 3.4 meters long! it likely had the strongest bite force of any fish, living or fossil..
DICKOSTEUS ^ reconstruction (photos 5 & 6); it lived in the middle devonian period 393.3β382.7 million years ago and had a lenght of 43.7 cm (17.2 in). all of these fish had an armoured head! pretty sick!
COCCOSTEUS ^ reconstructions (photos 7 & 9) & a fossil (photo 8); it lived from the middle to the late devonian 393.3β359.3 Ma and it grew to around 29.6β39.4Β cm (11.7β15.5Β in) in length. as an arthrodire, it had an internal joint between its neck vertebrae and the back of its skull, allowing it to open its mouth quite wide and chomp onto bigger prey...
A fossilized placoderm of a Coccosteus cuspidatus from the Sandwick Fish Beds in Orkney, Scotland. This genus of arthrodiran armored fish was very small compared to its more famous relatives like Dunkleosteus, and was often used to reconstruct these larger genera due to its similar appearances. However, recent revisions in the size estimates of large placoderms suggests that scaling them to Coccosteus is not accurate, and many of its larger relatives are significantly smaller than previously assumed.
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Various fossil fishes of the Old Red Sandstone formation (predominantly Devonian) from A Guide to the Fossil Reptiles and Fishes in the Department of Geology and Paleontology in the British Museum (Natural History), 1896.
On a rainy Devonian day, a Tiktaalik father guards his eggs in a small forest river. Meanwhile, his hunting mate has her eye on a Bothriolepis. Another Bothriolepis is eating something buried in the river sediment, drawing the attention of a Coccosteus.
I've wanted to draw Tiktaalik for a while. It's easily the most depicted creature of the Devonian, but it always seems to get shown boldly pulling itself onto the land. While that was of course extremely important in hindsight, surely they spent much more of their time living quite happily underwater. So here's some interesting behaviour some lungfish do: the dads guard their eggs after they're lain in water plants.
From Prehistoric Animals, written/illustrated by William E. Scheele. 1954.