Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
There is a rising chorus of curmudgeons who decry the use of Latin names for bugs, ridiculing the vocabulary contests we hold around the fireplace of their imaginations. In reality we use scientific names because they're the less confusing way to swap practical advice about the details of each hatch.