Burnt-almond ark

Barbatia amygdalumtostum

Molluscs
IUCN: Not evaluated

Usual depth1–42 m
Water temperature20–30 °C
Best monthsJuly, August, and October
How commonOccasional

Photo credit: (c) portioid, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist

About this species

Barbatia amygdalumtostum, the almond ark or burnt-almond ark, is a species of bearded ark clams in the family Arcidae. It was described by Peter Friedrich Röding in 1798. Barbatia amygdalumtostum is found in the littoral and sublittoral of Indian and western Pacific Oceans. It is also known from the Miocene of Japan.

Text from the Wikipedia article “Barbatia amygdalumtostum”, 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: 42 records
February: 41 records
March: 33 records
April: 41 records
May: 71 records
June: 62 records
July: 99 records
August: 81 records
September: 73 records
October: 76 records
November: 46 records
December: 71 records

Depth and water temperature

Depth

Mostly recorded at 1–42 m · Deepest record: 55 m

0–10 m: 5 records
10–20 m: 0 records
20–30 m: 6 records
30–40 m: 6 records
40–50 m: 2 records
50–60 m: 1 records

Water temperature

Recorded in surface water of 20–30 °C

18–20 °C: 7 records
20–22 °C: 3 records
22–24 °C: 11 records
24–26 °C: 139 records
26–28 °C: 151 records
28–30 °C: 172 records

Photos

(c) portioid, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
no rights reserved, uploaded by Manis Lin · CC0 1.0 · iNaturalist
(c) River Ahlquist, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Edmundas Greimas, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Thomas Mesaglio, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Rod Lowther, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Rod Lowther, some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

English: Burnt-almond ark, burnt-almond ark

Names in 2 more languages

German: Gebrannte Mandel
Japanese: ベニエガイ［クロミノエガイ］

Other scientific names: Amygdalum frixum, Arca amygdalum, Arca amygdalumtostum, Arca bicolorata, Arca cruciata, Arca fusca, Barbatia (Ustularca) amygdalumtostum, Barbatia fusca, Barbatia rodatzi, Ustularca cruciata, Ustularca renuta

Similar species

Barbatia trapezina
Divaricated Ark
Acar plicata
Antique ark
Anadara antiquata
Indo-Pacific Ark
Arca navicularis
Kagoshima Blood Cockle
Anadara kagoshimensis
Sydney Cockle
Anadara trapezia

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).
1,044 open-data records from 1789 to 2020.
Species data updated October 26, 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.

Join the waitlist