Tetragonal Fiddler Crab
Gelasimus tetragonon
- Usual depth1–1 m
- Water temperature26–29 °C
- Best monthsJune, July, and August
- How commonRare
Photo credit: (c) Bernard DUPONT, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
Where and when
Where it has been recorded
Worldwide
Loading the map
Best months
Worldwide (open data)
- January: 22 records
- February: 39 records
- March: 46 records
- April: 60 records
- May: 50 records
- June: 63 records
- July: 68 records
- August: 76 records
- September: 47 records
- October: 44 records
- November: 40 records
- December: 34 records
Depth and water temperature
Depth
Mostly recorded at 1–1 m · Deepest record: 1 m
Water temperature
Recorded in surface water of 26–29 °C
Photos
(c) Bernard DUPONT, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist 
(c) Jason Alexander, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Wang J.P., some rights reserved (CC BY) · CC BY · iNaturalist 
(c) @tutikpitik, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist 
(c) Ronith Urs, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Sayee Girdhari, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) relew, some rights reserved (CC BY) · CC BY · iNaturalist
Names and classification
- English
- Tetragonal Fiddler Crab
Names in 4 more languages
- French
- Crabe violoniste commun
- Japanese
- ルリマダラシオマネキ
- Thai
- ปูก้ามดาบขาแดง
- Simplified Chinese
- 四角丑招潮
Other scientific names: Cancer tetragonon, Gelasimus affinis, Gelasimus Duperreyi, Gelasimus variatus, Uca (Gelasimus) tetragonon, Uca affinis, Uca duperreyi, Uca tetragonon
Similar species
Orange-clawed Fiddler CrabGelasimus vomeris
Dampier's Fiddler CrabGelasimus dampieri
Western Calling Fiddler CrabGelasimus hesperiae
Jocelyn's Fiddler CrabGelasimus jocelynae
Calling Fiddler CrabGelasimus vocans
- Eastern Calling Fiddler Crab
Gelasimus excisus
Sources and credits
Names and taxonomy: WoRMS (CC BY 4.0) and the GBIF Backbone (CC BY 4.0). Photos: iNaturalist observers, each under the licence shown (CC0, CC BY or CC BY-SA).
- Depth, temperature, months and maps: records from OBIS and GBIF under CC0 or CC BY.
- Conservation status as published by GBIF (IUCN Red List).
- 226 open-data records from 1790 to 2017.
- Species data updated November 2, 2026.
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