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Description

The Symmoriiformes form a group of cartilaginous fish related to the modern rat fishes. They had strange dorsal appendices that were probably used for sexual display. Symmorium is possibly a female Stethacanthus. They appeared during the Late Devonian and went extinct in the early Permian. Represented here:

Akmonistion zangerli Coates & Sequeira, 2001 (Manse Burn Formation, Serpukhovian, Scotland, UK)

Falcatus falcatus Lund, 1985 (Bear Gulch Limestone, Heath Formation, Serpukhovian, Montana, US)

Stethacanthus altonensis St. John & Worthen, 1875 (Bear Gulch Limestone, Heath Formation, Serpukhovian, Montana, US)

Symmorium reniforme Cope, 1893 (Linton Formation, Moscovian, Illinois, US)

info: spinops.blogspot.com/2021/09/s…

Description

The Symmoriiformes form a group of cartilaginous fish related to the modern rat fishes. They had strange dorsal appendices that were probably used for sexual display. Symmorium is possibly a female Stethacanthus. They appeared during the Late Devonian and went extinct in the early Permian. Represented here:

Akmonistion zangerli Coates & Sequeira, 2001 (Manse Burn Formation, Serpukhovian, Scotland, UK)

Falcatus falcatus Lund, 1985 (Bear Gulch Limestone, Heath Formation, Serpukhovian, Montana, US)

Stethacanthus altonensis St. John & Worthen, 1875 (Bear Gulch Limestone, Heath Formation, Serpukhovian, Montana, US)

Symmorium reniforme Cope, 1893 (Linton Formation, Moscovian, Illinois, US)

info: spinops.blogspot.com/2021/09/s…