The behaviour and development of some South Australian rhodacarid mites in laboratory cultures is presented under six headings: locomotion; feeding; grooming and defaecation; protection; mating; development. The sexual structures of three species and the eggs of six species are described. The noteworthy differences in behaviour amongst species are in their feeding (able or not able to catch collembola) , treatment of eggs (burying or not burying them) and mating position (male ventral or lateral to female). Functional aspects of structures involved in the observed behaviour are discussed.
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