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Acanthoda
2023-07-18 Snargl 01:12
What kind of animal is Acanthoda?
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.
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
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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...
See these colors in NCS, PANTONE, RAL palettes...
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.
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! :)