出典:Wikipedia
出典:『Wikipedia』 (2011/06/10 12:14 UTC 版)
Macronaria is a clade of sauropod dinosaurs from the Middle Jurassic (Bathonian) to Late Cretaceous Periods of what are now North America, South America, Europe, Asia and Africa. The name means 'large nostrils' (from Greek makros 'big' + Latin nares 'nostrils'), in reference to the large nasal openings high on the head that probably supported fleshy resonating chambers. Macronaria consists of two main groups: the family Camarasauridae, and the clade Titanosauriformes. Titanosauriformes in turn contains the brachiosaurids and the titanosaurians and is one of the largest sauropod groups, which also contains most of the longest, tallest and most massive dinosaurs of all time.