Invertebrate
Zenopontonia Rex
Periclimenes imperatorAlso known as Imperial Shrimp
Emperor shrimp are vibrant commensal hitchhikers that spend their lives riding across tropical sea beds on the backs of nudibranchs and sea cucumbers. They roam across the host body to graze on sloughed mucus, trapped detritus, and external parasites, gaining both reliable meals and predator protection. Often encountered in mated pairs, these tiny crustaceans dart quickly into the host's body folds when startled by passing reef fish.
CommensalReef DwellerColorful
—observations
—countries
—peak records
Not EvaluatedConservation statusIUCN Red List categoriesLCNTVUENCREWEXNot Evaluated — not placed on the risk ladderRed List categories, explained →
Diet & preyParasitic copepods, Detritus, Organic debris
Predators
- Wrasses
- Damselfish
- Hawkfishes
ThreatsCoral reef degradation, rising water temperatures, and host loss
HabitatsTropical shallow coral reefs and lagoons
Life span1–2 years
Classification
- FamilyPalaemonidae
- SpeciesPericlimenes imperator
Range data is not available yet.
Interaction riskLow
- Low
- Moderate
- High
- Very high
- Why interaction risk is low
- Safe to observe at a normal distance.
Responsible observation
- Check Slow Hosts: Inspect the crevices and gills of large sea cucumbers and sea slugs.
- Avoid Direct Contact: Refrain from touching host organisms, which can dislodge or injure the shrimp.
Host Mollusc "Spanish Dancer" by DrTH80 is licensed under CC BY 2.0. To view a copy of this license, visit https://creativecommons.org/licenses/by/2.0/. · cc-by
Image unavailableHost Echinoderm Close Relative
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