Fossil evidence of different springtails behaviors, and the geological range of the body fossil record.

<p>From top to bottom: <i>Sminthurus longicornis</i> depositing eggs (Baltic amber) [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0191669#pone.0191669.ref001" target="_blank">1</a>]; <i>S</i>. <i>longicornis</i> with stalked spermatophores (Baltic amber) [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0191669#pone.0191669.ref012" target="_blank">12</a>]; courtship behavior of <i>Pseudosminthurides stoechus</i> (herein described; Spanish amber); aggregation of <i>Proisotoma communis</i> (herein described; Spanish amber) and unidentified entomobryomorphans (Dominican amber) [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0191669#pone.0191669.ref013" target="_blank">13</a>]; phoresy: <i>S</i>. <i>longicornis</i> over a harvestman, <i>Dicranopalpus ramiger</i> (Arachnida: Opiliones) (Baltic amber) [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0191669#pone.0191669.ref001" target="_blank">1</a>], and unidentified sminthuridid on an oedemerid beetle [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0191669#pone.0191669.ref014" target="_blank">14</a>], and a <i>Sphyrotheca</i>? sp. over a mayfly, <i>Borinquena parva</i> (Ephemeroptera) (Dominican amber) [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0191669#pone.0191669.ref015" target="_blank">15</a>] (see also <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0191669#pone.0191669.s002" target="_blank">S1 Fig</a> for a review of the general fossil record of Collembola).