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butthurt [soylentnews.org] writes:

Cryptomaster leviathan [wikipedia.org], so named because of its size and its habit of staying well hidden under forest debris, was discovered in 1969 in Oregon. The spider had been the only species known in its genus. However, arachnologists have now discovered that some Cryptomaster specimens have a pair of penile spikes, whereas others do not. Those lacking the spikes have been designated as a different species, Cryptomaster behemoth [wikipedia.org].

The research is published in ZooKeys [pensoft.net]. The Independent [independent.co.uk] (has a photo) and LiveScience [livescience.com] reported on it.

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