Isotomidae

These collembolans have fine setae or hairs on their body, but no scales; the abdominal segments are all ofequal length. There is a range of body colors and they are often striped or banded. This is a cosmopolitan family and many species live in soil or are associated with fresh water. Isotomurus palustris is widespread and one of the most frequently recorded springtails; it occurs along the margins of ponds and streams. Cryptopy-gus antarctus is abundant in the Antarctic, and populations of Folsomia candida are used to assess the effects ofchemicals on nontargetsoil invertebrates. Onespecies, Metisotomagrandiceps, is carnivorous on other collembolans.

Folsomia quadrioculata (Fig. 6.2e) Adults are about 3 mm long. Antennal segments 3 and 4 are not subsegmented; the anus is positioned ventrally. This species is distributed inNorth America and Europe; it has been reported indoors associated with potted flowers.

Isotomodes tenuis (Fig. 6.2h) Adults are about 3 mm long. The body is slender; antennal segments 3 and 4 are not sub-segmented; ocelli are absent, and the anus is positioned ventrally. This species is distributed in North America and it occurs indoors associated with potted plants.

Proisotoma frisoni (Fig. 6.1a) Adults are about 2 mm long. The body is mottled; the anus is terminal. This species is distributed in North America and it occurs indoors associated with potted plants.

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