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Acari (mites, water mites)
The order Acari is in the phylum Chelicerata, (spiders, harvestmen, scorpions, mites, ticks and horseshoe crabs)
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Order Acari (mites) Mites. Over 30 000 species have been described so far. These are medically and economically very important animals as they can transmit or cause disease in both plants and animals, e.g., scabies and mange. They tend to be only a few millimetres long. Most have four pairs of legs, but larvae have only three pairs. On the right is Hydrarachna sp., a water mite. Note that the first pair of legs do not have the swimming hairs that the other legs have. It is 5 - 8 mm long.
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On the left is Hygrobates sp. In contrast to Hydrarachna above it has no swimming hairs on its legs, just bristles. It is common in weedy ponds especially among duckweed. It is yellowish-green or blue with dark markings |
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