Strisores has a well-represented fossil record, with fossils of most major strisorean lineages known from the Paleogene.

The relationships of the Early Eocene Parvicuculus and Procuculus from the southern North Sea basin are unresolved, but they bear some similarities to cypselomorphs.

The fossil evidence is quite consistent in this group.
Over some 20 million years, throughout the Eocene, the present-day diversity (as well as some entirely extinct lineages) slowly unfolds.
By mid-Oligocene, some 30 million years ago, the crown lineages are present and adapting to their present-day ecological niches.

By the distribution of fossils, the Paleogene radiation seems to have originated in Asia, which at that time became a highly fragmented landscape as the Himalayas lifted up and the Turgai Strait started to disappear.

Several fossil taxa are tentatively placed here as basal or incertae sedis
Eocypselus (Late Paleocene or Early Eocene)
Paraprefica (Early Eocene?)

Archaeotrogonidae (Early Eocene of England ?-
Late Eocene/Early Oligocene of France)
Hassiavis (Middle Eocene of Messel, Germany) - Archaeotrogonidae?

Protocypselomorphus (Middle Eocene of Messel, Germany)
Strisores has a well-represented fossil record, with fossils of most major strisorean lineages known from the Paleogene.
The relationships of the Early Eocene Parvicuculus and Procuculus from the southern North Sea basin are unresolved, but they bear some similarities to cypselomorphs.
The fossil evidence is quite consistent in this group. Over some 20 million years, throughout the Eocene, the present-day diversity (as well as some entirely extinct lineages) slowly unfolds. By mid-Oligocene, some 30 million years ago, the crown lineages are present and adapting to their present-day ecological niches.
By the distribution of fossils, the Paleogene radiation seems to have originated in Asia, which at that time became a highly fragmented landscape as the Himalayas lifted up and the Turgai Strait started to disappear.
Several fossil taxa are tentatively placed here as basal or incertae sedis
Eocypselus (Late Paleocene or Early Eocene)
Paraprefica (Early Eocene?)
Archaeotrogonidae (Early Eocene of England ?- Late Eocene/Early Oligocene of France)
Hassiavis (Middle Eocene of Messel, Germany) - Archaeotrogonidae?
Protocypselomorphus (Middle Eocene of Messel, Germany)
Strisores