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Vetenskapligt namn: [Limulus polyphemus]
Utbredning: Västra Atlanten och Mexikanska golfen
Storlek: Upp till 50 cm i diameter
Föda: Musslor och havsborstmaskar

Dolksvansarna tillhör leddjuren och är närmast släkt med spindlar och skorpioner och på lite längre håll med kräftdjuren. På undersidan av dolksvansens hårda skal sitter munnen, benen samt de så kallade bokgälarna som de tar upp syre ur havsvattnet med. Det finns fyra arter av dolksvansar och de kallas ofta för ”levande fossil” eftersom de till det yttre har sett oförändrade ut under 400 miljoner år.
Filmen visar en dolksvans som byter skal. Det måste de göra varje gång de ska växa eftersom skalet inte kan bli större. När skalet lossnat är dolksvansen mjuk och kan växa och därefter bildas ett nytt skal. Akvariets dolksvansar finns i ett akvarium jämte klapptanken i akvariestudion.
Läs mer på http://sv.wikipedia.org/wiki/Limulus_polyphemus