Mactra quadrangularis

Where and when

Where it has been recorded

Worldwide

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Best months

Worldwide (open data)

January: 17 records
February: 14 records
March: 23 records
April: 63 records
May: 32 records
June: 11 records
July: 26 records
August: 15 records
September: 21 records
October: 36 records
November: 7 records
December: 6 records

Depth and water temperature

Water temperature

Recorded in surface water of 20–21 °C

18–20 °C: 100 records
20–22 °C: 8 records

Photos

(c) Kim, Hyun-tae, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Kim, Hyun-tae, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Zinogre, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Se Lena, some rights reserved (CC BY) · CC BY · iNaturalist
(c) W Rao, some rights reserved (CC BY) · CC BY · iNaturalist
(c) W Rao, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Se Lena, some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

Names in 3 more languages

Japanese: シオフキ
Korean: 동죽
Simplified Chinese: 方形馬珂蛤

Other scientific names: Mactra bonneauii, Mactra gibbosula, Mactra veneriformis, Mactra zonata, Trigonella quadrangularis, Trigonella veneriformis

Similar species

Australian Mactra
Mactra australis
Chinese surf clam
Mactra chinensis
Mactra pura
Agate Trough Shell
Mactra achatina
Pretty Trough Shell
Mactra eximia
Mactra maculata

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).
237 open-data records from 1985 to 2021.
Species data updated November 4, 2026.