Striped White Sea Slug

About this species

Chromodoris willani, commonly known as Willan's chromodoris, is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Chromodorididae. The species is named for the renowned nudibranch taxonomist Dr. Richard C. Willan.

Text from the Wikipedia article “Chromodoris willani”, 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: 154 records
February: 178 records
March: 182 records
April: 267 records
May: 193 records
June: 115 records
July: 95 records
August: 144 records
September: 113 records
October: 121 records
November: 174 records
December: 171 records

Depth and water temperature

Depth

Mostly recorded at 10–25 m · Deepest record: 55 m

0–10 m: 10 records
10–20 m: 72 records
20–30 m: 24 records
30–40 m: 1 records
40–50 m: 3 records
50–60 m: 2 records

Water temperature

Recorded in surface water of 19–30 °C

18–20 °C: 1 records
20–22 °C: 12 records
22–24 °C: 19 records
24–26 °C: 41 records
26–28 °C: 18 records
28–30 °C: 201 records

Photos

(c) Pauline Walsh Jacobson, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Georgina Jones, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Georgina Jones, some rights reserved (CC BY-SA) · CC BY-SA · iNaturalist
(c) Paolo Co, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Jay Paroline, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Pauline Walsh Jacobson, some rights reserved (CC BY) · CC BY · iNaturalist
(c) 呂一起(Lyu yi-chi), some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

English: Striped White Sea Slug, Willan's Chromodoris

Names in 3 more languages

French: Doris de Willan
Japanese: ミゾレウミウシ
Simplified Chinese: 威廉多彩海牛, 威廉多彩海蛞蝓

Similar species

Anna's Chromodoris
Chromodoris annae
Chromodoris colemani
Elisabeth's Chromodoris
Chromodoris elisabethina
Pyjama Rainbow Dorid
Chromodoris lochi
Magnificent Chromodoris
Chromodoris magnifica
Striped pyjama nudibranch
Chromodoris quadricolor

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).
655 open-data records from 1976 to 2026.
Species data updated October 26, 2026.