New Zealand Nut Shell

About this species

Linucula hartvigiana, commonly known as clam nut or nut shell, is a bivalve mollusc. Linucula hartvigiana has a brown oval shell and grows up to 6-8mm in width. Linucula hartvigiana is found in unpolluted subtidal and intertidal muddy-sand habitats throughout New Zealand.

Text from the Wikipedia article “Linucula hartvigiana”, 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: 10 records
February: 11 records
March: 9 records
April: 12 records
May: 11 records
June: 5 records
July: 5 records
August: 18 records
September: 22 records
October: 6 records
November: 17 records
December: 23 records

Depth and water temperature

Depth

Mostly recorded at 0–113 m · Deepest record: 201 m

0–10 m: 25 records
10–20 m: 7 records
20–30 m: 12 records
30–40 m: 1 records
40–50 m: 7 records
50–60 m: 3 records
60–70 m: 3 records
70–80 m: 4 records
80–90 m: 1 records
90–100 m: 1 records
100–110 m: 0 records
110+ m: 8 records

Water temperature

Recorded in surface water of 8–18 °C

6–8 °C: 7 records
8–10 °C: 6 records
10–12 °C: 1 records
12–14 °C: 7 records
14–16 °C: 24 records
16–18 °C: 28 records
18–20 °C: 1 records

Photos

(c) Javier, some rights reserved (CC BY), uploaded by Javier · CC BY · iNaturalist
(c) Javier, some rights reserved (CC BY), uploaded by Javier · CC BY · iNaturalist
(c) Saryu Mae 前朝琉, some rights reserved (CC BY), uploaded by Saryu Mae 前朝琉 · CC BY · iNaturalist
(c) Saryu Mae 前朝琉, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Javier, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Javier, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Lisa Bennett, some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

English: New Zealand Nut Shell

Other scientific names: Nucula (Lamellinucula) hartvigiana, Nucula hartvigiana, Nucula lacunosa, Nucula sulcata

Similar species

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).
333 open-data records from 1904 to 2021.
Species data updated November 4, 2026.