How to spot the Harlequin shrimp when scuba diving
Odontodactylus scyllarus
Found throughout the Indo-Pacific region from East Africa and the Red Sea to Hawaii, north to southern Japan and south to Australia. Two species exist: Hymenocera elegans (more western distribution) and Hymenocera picta (more eastern distribution), with overlapping ranges in parts of Southeast Asia.
Present year-round in their habitats. Diurnal (day-active), making them observable during day dives, though they may be more active during early morning or late afternoon.
Tropical waters, typically 24-29°C (75-84°F).
Found on coral reefs, typically in shallow waters from 2-20m depth. Almost always found on or near their prey - starfish, particularly crown-of-thorns. Look for them on coral rubble, reef flats, and around coral bommies. Their distinctive white body with blue, purple or orange spots makes them striking once spotted, though they're small (2-5cm). Often found in pairs. Prime locations include Anilao (Philippines), Lembeh Strait (Indonesia), Tulamben (Bali), and sites throughout Thailand, Malaysia, and the Maldives. Macro photography subjects requiring patience and careful searching.
Worldwide observation of the Odontodactylus scyllarus
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Data sources
- Photos: Wikimedia Commons
- Distribution and specie data: GBIF (Global Biodiversity Information Facility)
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