There are 120,000 known species of Hymenoptera. Most people would think that nearly all species of Hymenoptera are known. However, this is far from the case. Scientists estimate that there are 1,000 unclassified but known species (like a certain species that is considered one species is actually two or three species, it has happened before), and 5 to 10 million species of Hymenoptera yet to be discovered and classified.
- Almanac 2014, National Geographic
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