Semi-twisted ark

Trisidos semitorta

Molluscs
IUCN: Not evaluated

Usual depth27–51 m
Water temperature19–29 °C
Best monthsJune and October
How commonRare

All species

Where and when

Where it has been recorded

Worldwide

Loading the map

Best months

Worldwide (open data)

January: 2 records
February: 5 records
March: 4 records
April: 1 records
May: 6 records
June: 16 records
July: 4 records
August: 5 records
September: 4 records
October: 10 records
November: 3 records
December: 4 records

Depth and water temperature

Depth

Mostly recorded at 27–51 m · Deepest record: 51 m

20–30 m: 2 records
30–40 m: 1 records
40–50 m: 2 records
50–60 m: 1 records

Water temperature

Recorded in surface water of 19–29 °C

18–20 °C: 1 records
20–22 °C: 0 records
22–24 °C: 4 records
24–26 °C: 24 records
26–28 °C: 40 records
28–30 °C: 47 records

Names and classification

English: Semi-twisted ark, Half-Propeller Ark, Half-Twisted Ark, semi-twisted ark

Names in 2 more languages

German: Halbgedrehte Archenmuschel
Simplified Chinese: 半扭魁蛤

Other scientific names: Arca semitorta

Similar species

Propeller ark
Trisidos tortuosa
Divaricated Ark
Acar plicata
Antique ark
Anadara antiquata
Indo-Pacific Ark
Arca navicularis
Burnt-almond ark
Barbatia amygdalumtostum
Kagoshima Blood Cockle
Anadara kagoshimensis

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).
306 open-data records from 1895 to 2021.

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