Grey sea slug

About this species

Jorunna tomentosa is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Discodorididae.

Text from the Wikipedia article “Jorunna tomentosa”, 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: 101 records
February: 91 records
March: 148 records
April: 288 records
May: 312 records
June: 248 records
July: 218 records
August: 184 records
September: 77 records
October: 66 records
November: 104 records
December: 108 records

Depth and water temperature

Depth

Mostly recorded at 4–25 m · Deepest record: 163.9 m

0–10 m: 132 records
10–20 m: 114 records
20–30 m: 50 records
30–40 m: 12 records
40–50 m: 4 records
50–60 m: 0 records
60–70 m: 0 records
70–80 m: 0 records
80–90 m: 2 records
90–100 m: 0 records
100–110 m: 0 records
110+ m: 1 records

Water temperature

Recorded in surface water of 8–27 °C

6–8 °C: 1 records
8–10 °C: 36 records
10–12 °C: 163 records
12–14 °C: 99 records
14–16 °C: 0 records
16–18 °C: 9 records
18–20 °C: 8 records
20–22 °C: 29 records
22–24 °C: 0 records
24–26 °C: 0 records
26–28 °C: 1 records

Photos

(c) Heine Jensen, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Heine Jensen, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Tine Kinn Kvamme, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Tine Kinn Kvamme, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Lou Wagstaffe, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Bernard Picton, some rights reserved (CC BY) · CC BY · iNaturalist
(c) D. Rafael S. Fernandes, some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

English: Grey sea slug, Velvet Dorid, White jorunna, grey sea slug, white jorunna

Names in 2 more languages

German: Graue Sternschnecke, Schwamm-Jorunna, Schwamm-Sternschnecke, Weiße Jorunna
French: Jorunna blanche

Other scientific names: Doris johnstoni, Doris obvelata, Doris philippii, Doris tomentosa, Jorunna johnstoni

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).
1,749 open-data records from 1888 to 2024.
Species data updated November 3, 2026.