Juergen Freund / Imperial / Emperor shrimps (Periclimenes imperator / Zenopontonia rex) on a sea cucumber. Lembeh Strait, North Sulawesi, Indonesia.

Robert Thompson / Emperor dragonfly (Anax imperator) resting, Hampshire, UK, June,

Stephen Dalton / Emperor dragonfly (Anax imperator) in flight, male, UK

Stephen Dalton / Emperor dragonfly (Anax imperator) in flight, UK

Stephen Dalton / Emperor dragonfly {Anax imperator} male in flight, UK

Georgette Douwma / Emperor angelfish (Pomacanthus imperator). Red Sea, Egypt.

Georgette Douwma / Emperor angelfish (Pomacanthus imperator) with Lyretail anthias / Goldies (Pseudanthias squamipinnis). Red Sea, Egypt (Digital composite)

Ingo Arndt / Emperor Scorpion (Pandinus imperator) photographed under ultraviolet light, Africa

Jeff Rotman / Emperor Shrimp (Periclimenes imperator / Zenopontonia rex) living inside gills of Spanish Dancer Nudibranch (Hexabranchus sanguineus). Egypt, Red Sea.

Ross Hoddinott / Female emperor dragonfly (Anax imperator) laying eggs at the edge of a pond. Cornwall, UK.

Ross Hoddinott / Female emperor dragonfly (Anax imperator) laying eggs at the edge of a pond. Cornwall, UK.

LYNN M. STONE / Emperor tamarin {Saguinus imperator} captive