What question did this study set out to answer?

The research aims to explore the characteristics and evolutionary significance of Cladoselache during the Devonian Period.

January 23, 2026

Cladoselache, a puzzling ancient shark-like fish

LBLoren E. BabcockGeological Museum of China

Key Points

The research aims to explore the characteristics and evolutionary significance of Cladoselache during the Devonian Period.
Examination of numerous fossil specimens of Cladoselache.
Collection of fossils from Late Devonian-age concretions.
Analysis of Cladoselache's adaptations to varying habitats.
Cladoselache exhibits significant morphological features of shark-like fishes.
Numerous near-complete specimens highlight its prevalence during the Devonian Period.
Research suggests it played a vital role in the diversification of early cartilaginous fishes.

Abstract

Cladoselache, a puzzling ancient shark-like fish Loren E. Babcock, Professor in the School of Earth Sciences at The Ohio State University, introduces research on Cladoselache, a puzzling ancient shark-like fish. The Devonian Period, ~420 to 359 million years ago, is known in colloquial terms as the “Age of Fishes.” During this time, early cartilaginous and bony fishes experienced substantial diversification and adaptation to varied habitats. One characteristic and commonly illustrated Devonian fish is the shark-like Cladoselache (pronounced “klade-oh-sell-æ-key”), known from numerous specimens, some virtually complete, found in Late Devonian-age (~370 million-year-old) iron-carbonate concretions collected in and around Cleveland, Ohio, U.S. (1-4)

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