Flat Pillbox Crab

Where and when

Where it has been recorded

Worldwide

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Best months

Worldwide (open data)

January: 15 records
February: 11 records
March: 7 records
April: 11 records
May: 13 records
June: 2 records
July: 6 records
August: 5 records
September: 9 records
October: 14 records
November: 14 records
December: 8 records

Depth and water temperature

Depth

Mostly recorded at 0–1 m · Deepest record: 243 m

0–10 m: 46 records
10–20 m: 1 records
20–30 m: 1 records
30–40 m: 0 records
40–50 m: 0 records
50–60 m: 0 records
60–70 m: 0 records
70–80 m: 0 records
80–90 m: 0 records
90–100 m: 0 records
100–110 m: 0 records
110+ m: 1 records

Water temperature

Recorded in surface water of 8–18 °C

6–8 °C: 1 records
8–10 °C: 1 records
10–12 °C: 2 records
12–14 °C: 18 records
14–16 °C: 3 records
16–18 °C: 14 records

Photos

(c) Kelvin Perrie, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Sebastian Doak, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Emily Roberts, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Kelvin Perrie, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Lisa Bennett, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Angus Campbell, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Tony Wills, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist

Names and classification

English: Flat Pillbox Crab, Flat Spider Crab, Pill Box Crab

Other scientific names: Elamena quoyi, Elamene quoyi, Halicarcinus Huttoni, Halicarcinus innominata, Halicarcinus innominatus

Similar species

Three-pronged Spider Crab
Halicarcinus ovatus
Cook's Pillbox Crab
Halicarcinus cookii
Flattened Crab
Halicarcinus planatus
Variable pillbox crab
Halicarcinus varius
Estuarine Pillbox Crab
Halicarcinus whitei
Tong's Pillbox Crab
Halicarcinus tongi

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).
79 open-data records from 1920 to 2024.
Species data updated November 3, 2026.