Triangular Tellin

Where and when

Where it has been recorded

Worldwide

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Best months

Worldwide (open data)

January: 81 records
February: 47 records
March: 49 records
April: 81 records
May: 35 records
June: 26 records
July: 31 records
August: 42 records
September: 48 records
October: 50 records
November: 38 records
December: 55 records

Depth and water temperature

Depth

Mostly recorded at 0 m · Deepest record: 4 m

0–10 m: 81 records

Water temperature

Recorded in surface water of 14–27 °C

12–14 °C: 55 records
14–16 °C: 239 records
16–18 °C: 37 records
18–20 °C: 33 records
20–22 °C: 70 records
22–24 °C: 54 records
24–26 °C: 0 records
26–28 °C: 1 records

Photos

(c) Thomas Mesaglio, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Gary Williams, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Thomas Mesaglio, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Tim, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Rod Lowther, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Gary Williams, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Tim, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist

Names and classification

English: Triangular Tellin

Other scientific names: Tellina (Macomona) deltoidalis, Tellina deltoidalis, Tellina diemenensis, Tellina semifossilis, Tellina tristis

Similar species

Wedge Shell
Macomona liliana
Baltic macoma
Macoma balthica
Fine-ridged Tellen
Semelangulus tenuiliratus
Bartschicoma edgari
Angled wedge shell
Bartschicoma gaimardi
Dallitellina rostrata

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).
855 open-data records from 1900 to 2017.
Species data updated November 4, 2026.