Scaley-leaved Cacti?

Fresh evidence of why you can't accept everything you find on the internet as gospel. The following quote if from an article (made available to use in newsletters for free) on creating desert terrariums:

"The surfaces of many cacti are comprised of minute scaly leaves covered with clusters of sharp spines."

Really? Most cacti don't have leaves, scaly or otherwise, except at the seedling stage.

And besides, in my opinion, a terrarium isn't really the best environment for growing desert cacti.