2023-07-18 Snargl 1 minute 12 seconds

What kind of animal is Acanthoda?

Painting of a large animal in a forest with water and rocks in the foreground and trees in the background
Robot is standing in the water near rocks and trees
Close up of a butterfly on a flower with water droplets on it's wings
Small stuffed animal with a big head
Green and yellow creature with a skull on its head and legs

Acanthoda is an extinct class of jawed fishes that lived from the Early Silurian to the Permian periods.

However, they were not true sharks, but rather a paraphyletic group of various fish lineages that were basal to modern cartilaginous fish, such as sharks, rays, and chimaeras.

Acanthodians had a cartilaginous skeleton, but their fins had a wide, bony base and were reinforced on their anterior margin with a dentine spine.

They have been divided into four orders: Acanthodiformes, Climatiiformes, Diplacanthiformes, and Ischnacanthiformes, based on their morphology and scale ornamentation.

Acanthodians were among the first vertebrates to colonize freshwater habitats, and some of them may have been able to survive in brackish or hypersaline waters.

During the Carboniferous and Permian periods, the abundance and diversity of these fishes declined, and by the end of the Permian they were extinct, possibly due to competition and predation by more evolved fish groups.

Example of the color palette for the image of Acanthoda

Picture with primary colors of Outer Space, Cadet blue, Light gray, Dark chestnut and Sea blue
Top 5 color shades of the illustration. Arranged in descending order of frequency of occurrence (first - more often, last - more rare).
See these colors in NCS, PANTONE, RAL palettes...
RAL Classic
RAL 7022
RAL 5024
RAL 7047
RAL 1036
RAL 5021
RAL Design
RAL 160 30 05
RAL 000 85 00
RAL 050 50 20

What does the Acanthoda look like?

Acanthoda is a name for an ancient class
Of fishes with jaws and spines made of bone
They lived in the seas from Silurian to Permian
And had scales like rhomboids on their skin

Some were like sharks with a streamlined shape
And others were filter feeders with long gill rakers
They had many spines on their fins and body
And some had tooth plates fused to their jaws

They are not related to the modern sharks
But they share some features with bony and cartilaginous fish
They are a diverse and fascinating group of creatures
That have left behind many fossils for us to admire.


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The images you see on this page have been generated by AI - they are not real images of Acanthoda, but they are great nonetheless! :)
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