The oldest specimen of Archaeopteryx

The Painten specimen extends referred Archaeopteryx material into the earliest Tithonian; the 150–148 Ma atlas interval is a formation- and specimen-bounded envelope, not the origin of Avialae or crown birds.

All securely referred Archaeopteryx specimens discussed here come from Late Jurassic Bavarian lithographic limestones; that observed concentration does not demonstrate global absence elsewhere.

Archaeopteryx is a Late Jurassic avialan outside crown Neornithes; substantial anatomical variation among referred specimens does not make it the direct ancestor of living birds.

Referred Archaeopteryx skeletons preserve toothed jaws, a long bony tail and feather associations, while wing-bone cross-sections differ from those of specialized soaring birds.

The 150–0 Ma Aves route is an avialan-to-living-bird navigation anthology: referred Archaeopteryx material supplies a Late Jurassic fossil anchor, but Archaeopteryx is outside crown Neornithes and the endpoint is not crown-Aves origination.