Crikey, their penises gave them away, mate.

The complicately-shaped penises of camaenid land snails contain the critical characteristics to make or break a genus.

Ultimately, I’ve been writing Nature’s Nether Regions in my head since my biology teacher in highschool told me that identical-looking bumblebee species all have different penises. This is true for many, if not most, other animals as well, including these new land snail species (actually, two new genera) discovered in the Australian outback by my colleague Frank Köhler and his postdoc Francesco Criscione, using little more than the critters’ willies to go by. See their lovely Australian Museum blog post about this.

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