Protoopsis

Protoopsis is a genus of extinct ray-finned fish that lived during the Devonian period. These early bony fish are known from fossilized remains, primarily from the Gogo Formation in Western Australia, a Lagerstätte renowned for its exceptionally preserved vertebrate fossils. The genus Protoopsis contains at least one described species, Protoopsis gogoensis.

Fossil evidence suggests that Protoopsis possessed a streamlined body shape, indicating it was likely an active swimmer. Its skeletal structure shows a mix of primitive and more advanced features, placing it within the Osteichthyes (bony fish). Key characteristics include the presence of scales and fin rays. The jaw structure and dentition suggest a predatory or omnivorous diet, though specific dietary habits are inferred from the context of its environment and associated fossils.

The discovery and study of Protoopsis have contributed to our understanding of early vertebrate evolution, particularly the diversification of bony fishes during the Devonian, a period often referred to as the "Age of Fishes." Its presence in the Gogo Formation provides valuable insights into the palaeoecosystem of ancient reefs. The genus is considered important for tracing the evolutionary relationships among early osteichthyans.