Diamond Clam

About this species

Crassula aequilatera, known as the triangle shell, is a surf clam, a moderately large marine bivalve mollusc in the family Mactridae.

Text from the Wikipedia article “Crassula aequilatera”, licensed CC BY-SA 4.0. Read the article

Where and when

Where it has been recorded

Worldwide

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Best months

Worldwide (open data)

January: 83 records
February: 57 records
March: 65 records
April: 106 records
May: 58 records
June: 60 records
July: 68 records
August: 50 records
September: 58 records
October: 69 records
November: 33 records
December: 89 records

Depth and water temperature

Depth

Mostly recorded at 0–10 m · Deepest record: 126.5 m

0–10 m: 17 records
10–20 m: 0 records
20–30 m: 0 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 12–18 °C

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

Photos

(c) Lisa Bennett, some rights reserved (CC BY), uploaded by Lisa Bennett · CC BY · iNaturalist
(c) John Barkla, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Nathan Odgers, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Javier, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Andy McKay, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Rob Trame, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Jenny Saito, some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

English: Diamond Clam, Triangle Clam, Triangle Shell

Names in 1 more languages

Japanese: サンカクウバガイ

Other scientific names: Mactra aequilatera, Mactra aequilateralis, Spisula (Crassula) aequilateralis, Spisula aequilatera, Spisula aequilateralis

Similar species

Reddish Mactra
Austromactra rufescens
Contrary Mactra
Austromactra contraria
Oval Trough Shell
Cyclomactra ovata
Agate Trough Shell
Mactra achatina
Mactra maculata
Mactrotoma angulifera

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).
513 open-data records from 1962 to 2009.
Species data updated November 1, 2026.