Adult dorsal setal patterns in the family Phytoseiidae (Acari: Gamasina).

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Abstract
Twenty-seven pairs of setae are known to occur on the dorsum of adult Phytoseiidae. Twelve pairs are always present. Variations in the occurrence of the remaining 15 pairs, 5 on the podosoma and 10 on the opisthosoma, produce a number of dorsal setal patterns which are examined in the present study. There are nine known setal patterns on the podosoma, 32 on the opisthosoma and a total of 52 on the dorsum. There is little intraspecific variation in these setal patterns. The historical development of various concepts of setal patterns is discussed briefly. A system of notation for the setal patterns is proposed.

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