These three organisms live in groundwater: Hexabathynella aotearoae (top – around 1 millimetre long), Paracrangonyx compactus (centre) and Phreatoicus typicus. Like many other life forms that live in groundwater they are almost colourless and have poor or no eyesight. Many are also small and have brief life cycles. They have adapted to an environment with a limited and unreliable supply of food.
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