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Although there may be other genera whose fossils have yet to be discovered, Alamosaurus (Greek for "Alamo lizard" and pronounced AL-ah-moe-SORE-us) is one of the few titanosaurs known to have lived in the late Cretaceous (70-65 million years ago) in North America, and possibly in vast numbers: According to one analysis, there may have been as many as 350,000 of these 60-foot-long herbivores living in Texas at any given time. Its closest relative appears to have been another titanosaur, Saltasaurus.
Bigger Than We Thought
A recent analysis has shown that Alamosaurus may have been a bigger dinosaur than originally estimated, possibly in the weight class of its more famous South American cousin Argentinosaurus. It turns out that some of the "type fossils" used to reconstruct Alamosaurus may have come from adolescents rather than full-grown adults, meaning that this titanosaur may well have attained lengths of over 60 feet from head to tail and weights in excess of 70 or 80 tons.
The Origin of the Name
By the way, it's an odd fact that Alamosaurus wasn't named after the Alamo in Texas, but the Ojo Alamo sandstone formation in New Mexico. This herbivore already had its name when numerous (but incomplete) fossils were discovered in the Lone Star State, so you might say that everything worked out in the end!