Any of various insects, including the silverfish and firebrats, of the order Thysanura (now Zygentoma), which have three long caudal filaments.
2008, Timothy J. Bradley, Saline-water Insects: Ecology, Physiology and Evolution, Jill Lancaster, Robert A. Briers, Aquatic Insects: Challenges to Populations: Proceedings of the Royal Entomological Society's 24th Symposium, page 22,
Marine thysanurans are another abundant and highly successful group of apterygotes able to exploit the ocean shore.
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