abdominal segment, and a small tubular structure (collophore) on 1st abdominal segment. Antennae short, 4- to 6-segmented. Metamorphosis simple.

Similar orders: (1) Protura (p. 60): no antennae or furcula. (2) Thysanura (p. 60): cerci present; some abdominal segments with styli. (3) Small wingless Pterygota (p. 56) : no furcula. Immature stages : Similar to adult stage.

Habits: Springtails occur in soil and leaf litter, under bark and in decaying wood, in fungi, and on the surface of water (freshwater ponds and along the seashore); a few occur on vegetation. Species with a furcula are jumpers; the furcula is normally folded forward under the abdomen, and the insect jumps by suddenly extending the furcula ventrally and posteriorly.

Importance: Important chiefly as scavengers, rarely as pests. Often very abundant, their populations sometimes numbering several million individuals per acre.

Classification: Two suborders, Arthropleona and Symphypleona. differing in body shape and segmentation. No. of species: World, 2000; N. America, 314.

Suborder Arthropleona Body elongate. Abdomen distinctly 6-segmented.

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