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This 46mm (1.8 inches) female P. spiniceps has what looks like a small nub in the middle of her back. It is actually a 6.2mm (less than a quarter of an inch) long male, the world's smallest known, sexually mature vertebrate. (Image: T.WPietsch/UW)
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This 46mm (1.8 inches) female P. spiniceps has what looks like a small nub in the middle of her back. It is actually a 6.2mm (less than a quarter of an inch) long male, the world's smallest known, sexually mature vertebrate. (Image: T.WPietsch/UW) |