Lemon pleurobranch

About this species

Berthellina citrina, or the orange gumdrop, is a species of sea slug in the family Pleurobranchidae. It is found in rock pools in the intertidal zone and in shallow water in the tropical and subtropical Indo-Pacific region.

Text from the Wikipedia article “Berthellina citrina”, 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: 46 records
February: 26 records
March: 42 records
April: 41 records
May: 23 records
June: 20 records
July: 23 records
August: 31 records
September: 42 records
October: 36 records
November: 27 records
December: 39 records

Depth and water temperature

Depth

Mostly recorded at 1–44 m · Deepest record: 171 m

0–10 m: 24 records
10–20 m: 8 records
20–30 m: 1 records
30–40 m: 1 records
40–50 m: 6 records
50–60 m: 1 records
60–70 m: 0 records
70–80 m: 0 records
80–90 m: 0 records
90–100 m: 0 records
100–110 m: 1 records
110+ m: 1 records

Water temperature

Recorded in surface water of 12–30 °C

12–14 °C: 6 records
14–16 °C: 10 records
16–18 °C: 17 records
18–20 °C: 20 records
20–22 °C: 57 records
22–24 °C: 9 records
24–26 °C: 24 records
26–28 °C: 44 records
28–30 °C: 43 records

Photos

(c) Javier, some rights reserved (CC BY) · 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) Christopher Mark, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Christopher Mark, some rights reserved (CC BY) · CC BY · iNaturalist
(c) Kelvin Perrie, some rights reserved (CC BY) · CC BY · iNaturalist

Names and classification

English: Lemon pleurobranch, Apricot Side-gilled Sea Slug, Citrus Gumdrop, lemon pleurobranch, Orange Gumdrop

Names in 2 more languages

Japanese: ホウズキフシエラガイ
Korean: 빨강갯민달팽이

Other scientific names: Berthella citrina, Pleurobranchus citrinus

Similar species

Orange Gumdrop
Berthellina delicata
Forskal's sidegill slug
Pleurobranchus forskalii
Peron's side-gilled sea slug
Pleurobranchus peronii
Tomoberthella martensi
Pleurobranchus albiguttatus
Grand Pleurobranch
Pleurobranchus grandis

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).
344 open-data records from 1828 to 2025.
Species data updated October 26, 2026.