Zby atlanticus

Zby is an extinct genus of turiasaurian sauropod dinosaur known from the Late Jurassic, particularly late Kimmeridgian stage of the Lourinhã Formation, in central west Portugal. It contains a single species, Zby atlanticus. It is named after , who studied the geology and paleontology of Portugal.

== Discovery and naming == Zby is known solely from its holotype, a closely associated partial skeleton including a complete tooth with root, a fragment of cervical neural arch, an anterior chevron, and an almost complete right pectoral girdle and forelimb. It was discovered in 1996 in the Lourinhã Formation, Portugal by Octávio Mateus.