Photo credit: (c) harum.koh, 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: 33 records
- February: 58 records
- March: 68 records
- April: 121 records
- May: 170 records
- June: 88 records
- July: 76 records
- August: 68 records
- September: 47 records
- October: 49 records
- November: 43 records
- December: 30 records
Depth and water temperature
Water temperature
Recorded in surface water of 20–25 °C
Photos
(c) Ashwin Srinivasan, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Yung-Lun Lin, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Wang J.P., some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Takaaki Hattori, some rights reserved (CC BY) · CC BY · iNaturalist 
no rights reserved · CC0 1.0 · iNaturalist 
(c) りなべる, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Rosie Steinberg, some rights reserved (CC BY) · CC BY · iNaturalist
Names and classification
Names in 3 more languages
- Japanese
- ヒライソガニ
- Korean
- 납작게
- Simplified Chinese
- 平背蜞
Other scientific names: Grapsus (Platynotus) depressus, Platygrapsus convexiusculus, Platygrapsus depressus, Platynotus depressus
Similar species
Tunneling Mud CrabAustrohelice crassa
Smooth Shore CrabCyclograpsus lavauxi
Japanese mitten crabEriocheir japonica
Smooth Shore CrabCyclograpsus audouinii
Purple Mottled Shore CrabCyclograpsus granulosus
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).
- 745 open-data records from 1983 to 2021.
- Species data updated November 2, 2026.
Log what you see on your next dive
The free DiveHive diver app keeps your logbook with every sighting and shows what lives at the site you dive next.