Osteolepis

Osteolepis is an extinct genus of lobe-finned fish that lived during the Devonian Period. Its fossil anatomy documents early tetrapod relatives with paired fins and cosmine-covered scales.

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Sarcopterygii: Sarcopterygii is the vertebrate clade comprising lobe-finned fishes and tetrapods. Osteolepis belongs to this clade, whose fin structure distinguishes it from ray-finned fishes.
Osteolepis macrolepidotus: Osteolepis macrolepidotus is a species of Devonian lobe-finned fish known from Scottish fossils. This named species is among the best-known representatives of the genus.
Pectoral fin: A pectoral fin is a paired appendage located behind a fish’s head. Its internal bones show the lobe-finned construction found in Osteolepis.
Louis Agassiz: Louis Agassiz was a Swiss-American naturalist who studied and classified fossil fishes. Agassiz established the genus Osteolepis in his work on fossil fish remains.
Tetrapodomorpha: Tetrapodomorpha is the sarcopterygian lineage more closely related to tetrapods than to lungfish. Osteolepis is an early tetrapodomorph, part of the lineage leading toward land vertebrates.
Asterolepis: Asterolepis is an extinct genus of Devonian antiarch placoderm fish. Its fossils occur in the same Scottish Old Red Sandstone deposits as Osteolepis.
Pelvic fin: A pelvic fin is a paired appendage on the underside of a fish’s body. Its position and skeletal support help reconstruct Osteolepis locomotion.
Hugh Miller: Hugh Miller was a Scottish geologist and writer who collected and described fossils from the Old Red Sandstone. Miller’s collections and accounts helped bring Scottish Devonian fishes to scientific attention.
Cosmine: Cosmine is a layered tissue covering the scales and bones of many early sarcopterygians. Cosmine-covered scales are a characteristic feature of Osteolepis fossils.
Eusthenopteron: Eusthenopteron is an extinct genus of Devonian lobe-finned fish with tetrapod-like skeletal features. It offers a well-studied comparison for interpreting early tetrapodomorph anatomy.