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Hajar | profile | all galleries >> Palaeogalleries >> Palaeozoic Vertebrates >> Acanthodians tree view | thumbnails | slideshow

Acanthodians

Acanthodians, or "spiny sharks," were in the news recently when new evidence linking them to the earliest sharks (not a new idea) was encountered.

"Doliodus provides the strongest anatomical evidence to date that chondrichthyans arose from "acanthodian" fishes by exhibiting an anatomical mosaic of "acanthodian" and sharklike features."

Maisey et al. (2017): http://digitallibrary.amnh.org/handle/2246/6701
Mesacanthus mitchelli, beautifully preserved Lower Devonian acanthodian from Tillywandland Quarry, Forfarshire, Scotland.
Mesacanthus mitchelli, beautifully preserved Lower Devonian acanthodian from Tillywandland Quarry, Forfarshire, Scotland.		 Mesacanthus mitchelli, Lower Devonian, Tillywandland, Scotland
Mesacanthus mitchelli, Lower Devonian, Tillywandland, Scotland		 Diplacanthus crassisimus, 52 mm, Middle Devonian, Orkney.
Diplacanthus crassisimus, 52 mm, Middle Devonian, Orkney.
Sketch of the Diplacanthus specimen to explain the spines.
Sketch of the Diplacanthus specimen to explain the spines.		 Acanthodes lopatini, 9 cm, Lower Carboniferous, Krasnoyarsk, Russia
Acanthodes lopatini, 9 cm, Lower Carboniferous, Krasnoyarsk, Russia		 Exceptionally preserved Acanthodes bridgei, Upper Carboniferous, Hamilton Quarry, Kansas
Exceptionally preserved Acanthodes bridgei, Upper Carboniferous, Hamilton Quarry, Kansas
Mazon Creek Acanthodes
Mazon Creek Acanthodes

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