Grapsus longitarsis
- Usual depth1 m
- Water temperature27–29 °C
- Best monthsApril, May, and July
- How commonRare
Photo credit: no rights reserved · CC0 1.0 · iNaturalist
About this species
Grapsus longitarsis, also known as the long-legged rock crab, is a species of shore crab in the family Grapsidae. It was first described in 1851 by the American zoologist James Dwight Dana. This species occurs throughout the tropical Indo-Pacific, including Hawai'i, Tuamotu Archipelago, the Cook Islands, and has been recorded in regions such as Indonesia, and the coast of Somalia.
Text from the Wikipedia article “Grapsus longitarsis”, licensed CC BY-SA 4.0. Read the article
Where and when
Where it has been recorded
Worldwide
Loading the map
Best months
Worldwide (open data)
- January: 17 records
- February: 35 records
- March: 37 records
- April: 38 records
- May: 42 records
- June: 38 records
- July: 45 records
- August: 38 records
- September: 36 records
- October: 30 records
- November: 24 records
- December: 30 records
Depth and water temperature
Depth
Mostly recorded at 1 m · Deepest record: 1 m
Water temperature
Recorded in surface water of 27–29 °C
Photos
no rights reserved · CC0 1.0 · iNaturalist 
no rights reserved · CC0 1.0 · iNaturalist 
no rights reserved · CC0 1.0 · iNaturalist 
(c) Lexi Amico, some rights reserved (CC BY) · CC BY · iNaturalist 
no rights reserved · CC0 1.0 · iNaturalist 
(c) Daniel Eisenhauer, some rights reserved (CC BY) · CC BY · iNaturalist 
(c) Thomas Irvine, some rights reserved (CC BY) · CC BY · iNaturalist
Names and classification
Names in 1 more languages
- Japanese
- スネナガイワガニ
Other scientific names: Geograpsus longitarsis, Grapsus longitarsus, Grapsus subquadratus
Similar species
Cliff crabGrapsus grapsus
Natal lightfoot crabGrapsus tenuicrustatus
Mottled lightfoot crabGrapsus albolineatus
Purple Rock CrabLeptograpsus variegatus
Purple Climber CrabMetopograpsus frontalis
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.
- Descriptions: Wikipedia, licensed CC BY-SA, each linked to its article.
- Conservation status as published by GBIF (IUCN Red List).
- 86 open-data records from 1851 to 2013.
- Species data updated November 3, 2026.
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